Assessing a Measurement-Oriented Data Management Framework in Energy IoT Applications

1. Introduction

A Measurement-Oriented Data Management Framework systematically collects, processes, and stores Internet of Things (IoT) sensor-based data to ensure accuracy, consistency, and usability for analytics. Such a framework encompasses data acquisition, preprocessing, storage, and retrieval, facilitating real-time monitoring and informed decision-making like in human cognition-inspired condition management systems [1]. State of the art condition monitoring assesses system health by continuously measuring structural, environmental, and operational attributes of equipment and infrastructure. It relies on structured data pipelines and real-time analytics to derive meaningful insights. In this context, a measurement-oriented framework enables the efficient deployment of IoT services and modules such as fault detection, failure diagnostics, and prognostics for optimized maintenance [2,3,4,5]. These capabilities are especially relevant in the energy domain, where IoT technologies are widely applied to improve monitoring, efficiency, and decision-making. Literature reports several applications of IoT technologies in the energy sector, many of which concern power grid management. A cloud based IoT solution for fault detection and localization was used in power distribution systems in [6]. In [7], dynamic pricing under thresholding policies was used to reduce the peak consumption and better match the demand to supply smart grids. Energy consumption of residential buildings accounts for around 30–40% of the total energy use all over the world [8]. Therefore, home energy management systems (HEMS) can be a useful tool for significant electricity expenses reduction. Energy-efficient scheduling algorithm for demand-side management in smart grids achieved significant monetary savings in [9]. How dynamic electricity tariffs and grid charge designs influence residential consumer savings, tariff choices, and low-voltage grid reinforcement needs to support renewable energy integration was presented in [10]. Two-stage home energy management system, utilizing day-ahead electricity pricing tariffs, achieves an average cost reduction of 8.7%, as demonstrated in [11]. LSTM-based sequence-to-sequence model for appliance-level short term load forecasting in residential buildings was proposed in [12].

As energy-related applications are gaining ever more relevance, there is a growing need for tools that enable efficient and effective development of applications leveraging the vast data generated by the IoT [13,14,15]. Insights derived from IoT-connected devices are being utilized to develop new services, enhance real-time decision-making, improve efficiency, address critical challenges, and create innovative user experiences. Additionally, IoT applications can provide significant benefits to energy-intensive manufacturing enterprises by optimizing energy consumption, reducing operational costs, and improving overall sustainability.

For instance, in [16], an Elman recurrent neural network, was utilized to estimate the state of charge (SOC) and state of health (SOH) of lithium-ion batteries, leveraging its contextual memory for improved prediction accuracy. Wei et al. developed an online model to estimate the remaining driving range using real-world BEV data from Beijing, analyzing driving cycles and energy consumption to identify an optimal driving speed for maximum efficiency in [17]. Cloud-based battery condition monitoring platform was used to improve scalability, cost effectiveness, safety, reliability, and optimal operation of the large-scale battery energy storage systems in [18]. A cloud based IoT-enabled dynamic wireless charging metering service for electrical vehicles was realized in [19,20].

In such a variety of domains, problems, and technological solutions, we notice the lack of literature on works considering the efficient development of cloud-based solutions for seamless management of energy IoT data. This paper thus investigates the usefulness of a generic, cloud-based, measurement-oriented data collection system. We argue that the concept of measurement is at the very basis of the IoT paradigm and that collecting and managing data through a tool built on such a concept can enhance the development of applications. Based on a preliminary literature survey, we focused our research on three major energy application domains: vehicular batteries, low voltage (LV) test feeders and home energy management. As a tool, we use Measurify (previously known as Atmosphere), a non-vendor-locked, open source measurement oriented framework for managing smart things in IoT ecosystems [21]. The tool has been developed and tested in the automotive [20,22,23], human activity [24], sports activity [25] and health domains [26], and we are interested in understanding its effectiveness in the wider energy domain. Measurify provides a RESTful Application Programming Interface (API) [27] coded in Node.js. Node.js avoids the multi-threading burden by employing a non-blocking single-thread pattern and is able to efficiently serve multiple concurrent clients by operating asynchronously, employing the event-loop mechanism. For data management, the framework exploits the underlying MongoDB database and its seamlessly utilizable Mongoose persistence layer. A workflow for optimizing the integration of CSV files into MongoDB storage within the Measurify IoT application framework, facilitating the creation of application-specific resources, was proposed in [28] and evaluated in [29]. From an architectural point of view, the main requirements concern scalability, reusability, ease of deployment, and preservation of data integrity, and cross-domain standard IoT terminology. Measurify supports custom resource-type design, user/group, and right management.

The remainder of the paper is structured as follows: Section 2 characterizes the three targeted energy IoT application domains, based on literature analysis. For each one of these domains, an IoT data-rich service is chosen as an exemplary application, and Section 3 presents the modeling of those services through the Measurify framework. Experimental results are presented in Section 4. Section 5 draws the conclusions and indicates possible future work.

2. Energy Data Characterization in the Three Target Domains

IoT environments produce and use huge amounts of data. Handling this data effectively and gaining meaningful intuitions from them needs a deep understanding of their domains. To this end, we performed an extensive literature research and analyzed publicly available datasets. As anticipated, we focus on applications in three major energy domains: vehicular batteries, smart grids and building management.

2.1. Vehicular Batteries

Among the market available batteries for electric vehicles (EV), lithium-ion batteries feature high energy density, high power density, long service life, fast charging, lower self-discharge rate, and environmental friendliness and thus have found wide application in the area of consumer electronics [30]. State estimation of batteries in EVs is essential to optimize energy management strategy, extend the life cycle, reduce cost, and safeguard a safe application of batteries in EVs [31]. The main purpose of a battery management system (BMS) is to ensure safe and optimal use of the battery energy and provide accurate battery state information for the EV’s overall energy management. Alongside this, the BMS should have the capability to give proper interventions for the battery system if it is working in an abnormal condition such as over-charging or over-discharging. Overcharging of batteries can bring safety issues and generate chemistry degradation and short circuits that lead to fire and gas hazards. In a similar way, the over-discharging can damage the battery and shorten its lifetime by more than 50%. Precise battery measurement focuses on smaller unit measurement millivolt and milliamp accuracy and time synchronizing these voltages and current [32]. Precise and reliable battery state estimation is a critical tool for boosting the lifespan of the battery packs from 10 years to 20 years in the best case and generally result in a 30% lifetime improvement [33].

BMSs are well-established in portable electronic devices like cellular phones and notebooks. However, the implementation of BMS in EVs is still in the early stage because the number of cells in an EV is a hundred times higher than on portable devices. EV battery banks are designed to provide high voltage, current, and power, which makes BMS more complex than portable electronics. Figure 1 shows a typical EV BMS. The functional module consists of hardware as well as software components to collect data. The hardware structure consists of many kinds of sensors, actuators, controllers, cloud storage, and signal lines, whereas the software perspective contains measurement data parameters, states calculating algorithm (analytics tools) and methods, user interface (visualization), fault detection, and monitoring mechanism. Typical measured data for BMS consists of bus voltage, total current, cell voltage, temperature detection, and smoke detection. After sampling and preprocessing, measured data is forwarded to the control circuit as well as the cloud server. As a sample service implementation in this area, exploiting the Measurify IoT data framework, Section 3.1 analyze a module for the estimation of the battery SoC and EV range prediction.

2.2. LV Test Feeder

A LV feeder is a part of the electrical distribution system that delivers power from a distribution transformer to end-users, such as homes, businesses, or small industrial facilities. Structure of a low-voltage distribution grid connected to the medium-voltage grid through a transformer is presented in Figure 2. Smart meters are used as a sensor to measure household or small commercial loads. The sensor measures the energy usage data and forwards it to cloud storage. The measurements collected from an LV feeder are then used to feed services for power flow analysis. The LV test feeder is a radial distribution system operating at a base frequency of 50 Hz [34]. It is connected to the medium voltage network via a substation transformer, which steps down the voltage from 11 kV to 416 V. Both the main feeder and its laterals operate at 416 V.

Data collected from the LV feeder distributor can be used to generate insights on market trends, consumer behavior, system health, and critical alarms. By leveraging those dataset, various researchers modeled real-world scenarios, optimize grid efficiency, and enhance voltage stability [35,36]. These analysis are crucial to improving the reliability of the distribution system, integrating renewable energy sources, and ensuring the smooth operation of the feeders. Interactive information sharing between feeder distributors and consumers allows better scheduling and energy management. Among those services we choose power flow analysis because it enables the simulation of voltage drops, power losses, and load distribution in feeder networks, helping engineers assess system performance under different operating conditions. Section 3.2 presents stepwise functional methodology to calculate power loss in the LV feeder.

2.3. Home Energy Management System (HEMS)

A HEMS is a smart system that monitors, controls, and optimizes energy usage in a household. It integrates various devices such as smart meters, appliances, renewable energy sources, energy storage systems, and demand-side management strategies to improve energy efficiency and reduce costs [37]. HEMS typically uses automation, data analytics, and machine learning to schedule appliance operation, balance power consumption, and take advantage of time-of-use electricity pricing. It can also enhance grid stability by coordinating energy consumption with supply fluctuations. According to Ruano et. al. HEMS can be managed in four stages [38]. The first stage collects data, the electrical readings such as current, voltage and power, measured by smart meters/acquisition boards or by using specific sensors. In the second stage, namely the event detection, any change in the state of an appliance over time was noticed through thresholding based on historical data. In the third stage, feature extraction of each appliance based on the load signature was performed. Finally, in the fourth stage, the load was identified by using the extracted features.

The introduction of smart metering produces fine-grained energy consumption data allowing for the extraction of more valuable information of energy demand and production compared to having only an energy balance over an extended period of time. A precise demand-response functionality is expected to benefit from a much finer granularity of information, like appliance load monitoring [39]. The appliance load monitoring focuses on implementing detailed energy sensing and delivering information on the breakdown of the energy spent. There are two major appliance load monitoring approaches namely Intrusive Load Monitoring (ILM) and Non-Intrusive Load Monitoring (NILM), based on the number of sensors used. ILM, also referred to as distributed sensing, performs different activities such as occupancy detection, behavior monitoring, contextual sensing. In NILM, on the other hand, only power consumption by appliance as a single measurement is sensed. The ILM method is more accurate in measuring appliance-specific energy consumption, but less widespread, because of some practical difficulties, such as multiple sensor configuration, high costs, complex multimodal analysis and decision making.

A typical NILM data collection framework for HEMS is depicted in Figure 3. Electrical appliances such as computers, ovens, and washing machines are monitored using sensors or meters for electrical quantities (e.g., current, voltage, power). These measurements are influenced by parameters like sampling rate and accuracy. Data is transmitted via communication protocols (e.g., ZigBee, MQTT, HTTP) to a central server, stored in various file formats (e.g., CSV, HDF5, WAVE), and used for HEMS analytics including appliance scheduling and load forecasting.

The HEMS should offer advantages to both residential occupants and electricity suppliers for better exploitation of the power sources. For electricity suppliers, two-way communication allows a better organization of the network and the implementation of several mechanisms known as demand response to dynamically control load based on capacity analysis, emergency demand response, and supplementary service analysis by suppliers. Nowadays, dynamic electricity retail tariffs are commonly used to support renewable energy integration, allowing residential occupants to reduce their electricity costs by scheduling appliance usage efficiently. Section 3.3 presents an appliance scheduling method to recommend optimum hours for high electricity-consuming appliances.

3. Services Based on IoT Measurements

In this section, for each one of the domains described above, vehicular batteries, LV feeder, and HEMS, we deal with a significant problem and see how a relevant cloud-based service, that we draw from the literature, can be built exploiting a measurement-oriented framework such as Measurify.

Before going in the detail, we briefly present the generic design workflow supported by Measurify. The first step in the workflow consists of domain modeling, where the domain field objects are mapped to the Measurify API’s resources, each one with its own schema, that are accessible through the API routes. Table 1 provides an outlook of the main Measurify resources. Once a Measurify installation is configured with the domain-specific instantiation of the configuration resources (i.e., Features, Things, Devices and Tags), the system is ready to receive data (i.e., Measurements) in json format from the field through the common RESTful APIs. For the sake of data integrity verification, Measurify is in charge of checking that each received Measurements is formatted according to its corresponding. Measurify is in charge of verifying. More information can be found in [21].

For the reader’s convenience, Section 3.4 Table 2 provides a synopsys of three IoT services EV range prediction, power flow analysis and appliance scheduling, and Table 3) provides data characterization and mapping with Measurify resources.

3.1. Range Prediction

Range prediction is a complex and difficult problem and depends on a lot of influence factors. A data-driven energy consumption prediction method for EVs, developed in [40] for energy-efficient routing, has demonstrated both high prediction accuracy and ease of use. There are many different parameters that influence the range of vehicles such as SoC, ambient temperature, driving behavior, route and traffic as shown in Figure 4. The weightage of influencing parameters on EV range prediction have following values 54% SoC, 25% Ambient temperature, 10% Driver behavior, 6% Route, 5% Traffic, acording to [41]. Accuracy of estimated range for an EV mainly depends on the accuracy of the SoC estimation. The driving range depends upon both estimating the remaining energy in the battery and predicting the future energy consumption pattern of the remaining trip.

The SoC of a battery shows the level of charge remaining capacity in percentage compared with its maximum available capacity. It is a crucial parameter for the charging/discharging strategies to protect the battery from overcharging/over discharging. In [42], the authors critically analyzed the various algorithms to estimate the li-ion battery SoC. The real-time, accurate estimation of SoC in EVs is challenging because of the strong time-variables and nonlinear characteristics with the driving loads, operational conditions [31]. Open-circuit voltage (OCV) profiles play a crucial role in SoC estimation as they provide a direct relationship between voltage and battery capacity. During charging and discharging, the OCV changes with SoC due to battery chemistry, hysteresis effects, and aging, making accurate profiling essential for precise estimation. By leveraging OCV-SoC characteristics, BMS can improve SoC accuracy. To see the characteristics OCV during charging and discharging we can gain the relationship between voltage range and SoC as in Figure 5. The fifth cycle of charging and discharging from the Li-ion battery B0005, taken from the battery aging datasets, is used to visualize the graph [43]. The maximum charging voltage reaches 4.2V, while the discharge voltage drops to 2.7V. The charging OCV is higher than the discharging OCV due to voltage hysteresis, internal resistance, and electrochemical reaction dynamics, causing polarization effects and ion transport limitations.

It is a complete case for SoC estimation from BMS as in [18], but we move further to predict range of EV. Most studies regarding range estimation are focused on the prediction of the variable energy consumption and assume the remaining energy in the battery, in the form of SoC and SoH. Tannahill et al. proposed a range estimation method incorporating environmental and behavioral factors, along with SoC and vehicle efficiency, yielding greater accuracy than traditional SoC-based approaches [44]. A data-driven approach integrates real-world driving, geographical, and weather data to predict energy consumption across a road network. This method reduces error in multiple linear regression models to 12–14% of average trip consumption, with 7–9% attributed to SoC estimation [40].

The force required to move the electric vehicle, also known as the tractive force, is given by Equation (1) as the sum of the gravitational force, aerodynamic drag, and rolling resistance.

$$F_t=F_g+F_{ar}+F_r=mgsin\alpha +{\displaystyle \frac{1}{2}}{\delta }_d{C}_{d}A{(v+v_{fw})}^2+mg{c}_r$$

(1)

Where m is the mass of the vehicle, g is the gravitational acceleration, ${\delta }_d$ is the air density, $C_d$ is the drag coefficient, A is the vehicle’s frontal area, v is the speed, $v_{f}w$ is the frontal wind speed and cr is the rolling resistance coefficient. The necessary power delivered by an engine (dE) to travel a (ds) distance while the vehicle maintains a desired acceleration and speed is given by the following Equation (2).

$$dE={\displaystyle \frac{1}{3600}}\left[mg(fcos\alpha +sin\alpha )+{\displaystyle \frac{1}{2}}{\delta }_d{C}_{d}A{(v+v_{fw})}^2+(m+m_f){\displaystyle \frac{dy}{dt}}\right]ds$$

(2)

For simplicity we assume in a first order the rolling resistance coefficient, drag coefficient, air density and vehicle mass are constant, and the energy consumption can be described as a linear combination of the kinematic parameters ds, v2 ds, (dv/dt)ds, and h = ds sin$\alpha$ as in [45]. To represent the consumption of the auxiliaries, the formula was then extended with a time-linear, temperature-scaled term.

Block diagram of range prediction system’s workflow is illustrated in Figure 6. The methodology employed in this study integrates real-world physics-based computations to analyze vehicle energy consumption, incorporating aerodynamic drag, rolling resistance, and inertial forces. A data-driven approach utilizing linear regression is applied to predict future range and energy depletion based on historical trip data. Furthermore, the methodology includes visualization techniques to assess trip efficiency, enabling a comprehensive evaluation of energy usage patterns for electric vehicle performance analysis. It begins by defining EV and environmental constants while loading trip data, including battery and drive cycle data. The data undergoes preprocessing (resampling and imputation), followed by computing elevation, time difference, and distance. Aerodynamic and inertial forces are then calculated, leading to the computation of overall energy consumption, including regenerative braking effects. The system generates time-series data for SoC, distance, and energy, which is then used to train linear regression models and predicts range. Modeling of the range prediction service to a Measurify model is straightforward and mapped as in Table 3.

3.2. Power Flow Analysis

The global electrical power industry faces challenges like generation diversification, asset optimization, energy conservation, demand response, and carbon footprint reduction. Efficient energy monitoring and control are crucial for maximizing renewable energy benefits. Power (Sometimes called as Load ) flow analysis is a crucial method for examining power system operation and planning by determining node voltages and branch power flow based on a given generation state and network structure [46]. It provides a steady-state solution without considering transient processes, formulating the problem as a nonlinear algebraic equation derived from Kirchhoff’s Current Law (KCL) at each bus. The Newton-Raphson (NR) method solves these equations using iterative linearization based on Taylor series expansion. The general form of the power flow equations is given as follows:

$$ActivePowerEquation\left(P_i\right)=V_i\sum _{j=1}^n{V}_j\left(G_{ij}cos{\theta }_{ij}+B_{ij}sin{\theta }_{ij}\right)$$

(3)

$$ReactivePowerEquation\left(Q_i\right)=V_i\sum _{j=1}^n{V}_j\left(G_{ij}sin{\theta }_{ij}-B_{ij}cos{\theta }_{ij}\right)$$

(4)

where: $V_i,V_j$ are Voltage magnitudes at buses i and j, $G_{ij},B_{ij}$ are Conductance and susceptance between buses i and j, and ${\theta }_{ij}$ = Phase angle difference between buses i and j. After that, NR solves the nonlinear power flow equations iteratively by linearizing them using the Jacobian matrix until the error is within an acceptable threshold.

$$\left[\begin{array}{c}\Delta P\\ \Delta Q\end{array}\right]=\left[\begin{array}{cc}{\displaystyle \frac{\partial P}{\partial \theta }}& {\displaystyle \frac{\partial P}{\partial V}}\\ {\displaystyle \frac{\partial Q}{\partial \theta }}& {\displaystyle \frac{\partial Q}{\partial V}}\end{array}\right]\left[\begin{array}{c}\Delta \theta \\ \Delta V\end{array}\right]$$

(5)

Figure 7 depicts a block diagram of power flow analysis to calculate power losses in feeder to know the congestion time (overload time ) to reducing energy wastage for distribution system operators. It uses the Newton-Raphson method for power system studies. It begins with the load measurement data of the feeder, including bus data, line data, and load profiles. The next step involves mapping the power grid model, incorporating a slack bus and multiple load buses to represent the network structure. Then, power loss results are initialized, and the Newton-Raphson method is used to iterate over multiple time steps, solving power flow equations dynamically. The computed results help in analyzing power losses, which are crucial for identifying periods of high congestion. Finally, these insights help indicate congestion times, enabling effective load management strategies to improve system efficiency and reliability. The application domain can be easily mapped to the Measurify framework as in Table 3.

3.3. Appliances scheduling

Cost-reflective grid tariff designs encourage consumers to reduce peak demand by adjusting their electricity usage patterns, helping to balance the grid more efficiently [47]. As a result, power suppliers implement dynamic electricity tariffs, where prices vary based on demand, promoting cost-effective and sustainable energy consumption. Appliance scheduling services aim to get the most economical operational schedule of a set of appliances to achieve a minimum expenditure in electricity, for those appliances that have flexibility in starting time and/or other features, the operation dependence of inter-appliance and intra-appliance is scheduled to further exploit the price variation. The scheduling algorithm changes the power mode of each electric device dynamically. We follow a model predictive control method that uses a building energy management controller (BEMC), as in [48]. The timeline is divided into fixed-size schedulable slots. The BEMC gets the instant electricity price, operational time and the power consumption rating of each appliance for each time slot, and then solves an optimization problem to minimize the energy cost of electrical appliances over all available time-slot. The problem can be formulated as an optimization model with the objective of minimizing the total electricity cost over a given scheduling horizon.

$$Minimize\sum _t{P}_t\sum _i{x}_{i,t}{C}_i$$

(6)

Where: $P_t$ is the electricity price at time t, $x_{i,t}$ is a appliance signature representing state of load i at time t, $C_i$ is the power consumption of load i. This formulation helps in cost savings of residential occupants by shifting energy-intensive tasks to periods of lower electricity prices.

The methodology for appliance scheduling is based on a combination of descriptive analytics, time series analysis, cost optimization, and decision support systems (DSS) to recommend the most cost-effective hours for using high-power appliances as shown in Figure 8. Initially, the system aggregates household energy consumption data on an hourly basis and analyzes fluctuations in electricity prices to identify cost variations throughout the day. By multiplying hourly energy consumption by corresponding electricity prices, the system calculates the total cost of running appliances at different times. A rule-based decision-making approach is then employed, where hours with the lowest cost per kWh are recommended for operating energy-intensive appliances. This optimized scheduling helps in minimizing electricity bills and improving overall energy efficiency by shifting appliance usage to off-peak hours with lower rates. The appliance scheduling service seamlessly integrates with the Measurify framework, allowing for efficient mapping and utilization of its features as in Table 3.

3.4. Synopsis

This sub-section synthetizes the characterization of the three services presented above through three synoptical tables. First, Table 2 provides an outlook of the three energy IoT services, where the metamodeling illustrates inputs, outputs, data processing algorithms, stakeholders, benefits and constrains. Then, Table 3 summarizes the main data characteristics and its mapping to Measurify resource types.

Table 2. Synopsys of the investigated IoT services.

	Range prediction from BMS data	Power flow analysis from LV feeder data	Appliance scheduling from HEMS data
Goal of service	Predict travel distance from remaining SoC	Analyze feeder power losses	Recommend optimum hours for using high-power appliances.
Inputs	Environmental, vehicle and battery data	Load data	Power data
Output	SoC, Driving range	Power loss	Optimum schedule
Computation algorithm	Data-Driven Method for range prediction	Newton-Raphson method	Descriptive analytics and cost optimization techniques
Service stakeholders	Driver, battery supplieer and vehicle manufacturer	Power distributor	Residential customer, Power supplier
Benefits	Drivers can easily plan destinations and safe charging zones	Optimize energy distribution	Electricity cost reducing for residents
Constraint	Accurate range prediction requires minimum uncertainties in modeling battery limits, vehicle dynamics, environmental factors, and driving behavior.	Association between load dynamics and renewable energy integration	Some appliances must run immediately based on user needs

Table 2. Synopsys of the investigated IoT services.

	Range prediction from BMS data	Power flow analysis from LV feeder data	Appliance scheduling from HEMS data
Goal of service	Predict travel distance from remaining SoC	Analyze feeder power losses	Recommend optimum hours for using high-power appliances.
Inputs	Environmental, vehicle and battery data	Load data	Power data
Output	SoC, Driving range	Power loss	Optimum schedule
Computation algorithm	Data-Driven Method for range prediction	Newton-Raphson method	Descriptive analytics and cost optimization techniques
Service stakeholders	Driver, battery supplieer and vehicle manufacturer	Power distributor	Residential customer, Power supplier
Benefits	Drivers can easily plan destinations and safe charging zones	Optimize energy distribution	Electricity cost reducing for residents
Constraint	Accurate range prediction requires minimum uncertainties in modeling battery limits, vehicle dynamics, environmental factors, and driving behavior.	Association between load dynamics and renewable energy integration	Some appliances must run immediately based on user needs

Table 3. Characteristics of IoT services and mapping with Measurify resources.

	Range prediction from BMS data	Power flow analysis from LV feeder data	Appliance scheduling from HEMS data
Things	Battery cell and driving context	LV test feeder	Electrical appliance in house
Devices	Battery measurement emulator (ISL78714) other sensor	Smart meters	Plugwise Kit
Measurements	Environmental data, Vehicle data, Battery data	Feeder load of nodes	Power consumption data
Features	Temperature, elevation, speed, throttle, voltage, current, SoC, etc.	Load	Active Power
Sensitivity /accuracy of measurement	Device accuracy: ±2.5mV	Voltage measurement error smaller than 0,1%	of measurement reading ± 0,5 W
Representation of data	Time-series representation in CSV format	Time-series representation in CSV format	Time-series representation in CSV format

Table 3. Characteristics of IoT services and mapping with Measurify resources.

	Range prediction from BMS data	Power flow analysis from LV feeder data	Appliance scheduling from HEMS data
Things	Battery cell and driving context	LV test feeder	Electrical appliance in house
Devices	Battery measurement emulator (ISL78714) other sensor	Smart meters	Plugwise Kit
Measurements	Environmental data, Vehicle data, Battery data	Feeder load of nodes	Power consumption data
Features	Temperature, elevation, speed, throttle, voltage, current, SoC, etc.	Load	Active Power
Sensitivity /accuracy of measurement	Device accuracy: ±2.5mV	Voltage measurement error smaller than 0,1%	of measurement reading ± 0,5 W
Representation of data	Time-series representation in CSV format	Time-series representation in CSV format	Time-series representation in CSV format

The widespread use of IoT for data measurement, combined with the long-term accumulation and large-scale analysis of such data, requires careful definition of sampling rates (typically ranging from a few Hz to several kHz) to avoid both redundancy and the loss of transient, potentially valuable events. Heterogeneity in the measured sensors data is frequent, and can be due to different data sources, network and spatial distribution across the monitored area. These factors introduce synchronization challenges and variability in data collection intervals especially in dynamic environments or under unreliable network conditions. Such inconsistencies, caused by different sampling rates, node failures, packet loss, or measurement precision, can compromise data quality and hinder effective analysis. To address this, Measurify assigns an individual timestamp to every single sample within a measurement, ensuring accurate temporal alignment across heterogeneous data streams. Moreover, each measurement is linked to its source device, which allows spotting and keeping into account individual effects (e.g., drift).

4. Experimental result and Analysis

This section presents the case studies three services presented in Section 3. Table 4 summarizes the data sources, formats, computational platforms, and previous use of each dataset in similar IoT applications. All computations were carried out using Python within Jupyter Notebooks. Further details for each analysis are provided in the following subsections.

4.1. Range Prediction

This service validates range prediction of EV by using data-driven energy consumption model explained in Section 3.1. The energy consumption over road segments is estimated by linking the energy consumption with microscopic driving parameters environmental data (temperature, elevation); vehicle data (speed, throttle, motor Torque, longitudinal acceleration, regenerative braking signal); and battery data (voltage, current, temperature, SoC). We use TripA01 battery and heating data in real driving cycles from [49]. The trip was conducted on June 25, 2019, in the Munich East area under sunny weather conditions. The journey covered a distance of 7.43 km in 16.82 minutes. The battery temperature increased from 21.0°C to 22.0°C, while the SoC dropped from 86.3% to 80.3%. The ambient temperature at the start was 25.5°C, with a target cabin temperature of 23.0°C. The vehicle’s fan operated in automatic mode at Level 1, ensuring optimal cabin conditions throughout the trip. The vehicle specification, driving cycle information and others factor used for range prediction models are provided in Table A1 of Appendix A.

The SoC of the battery pack versus the driving range and energy depleted of EV looks like a straight line in (Figure 9). The blue line represents the actual traveled distance in proportion to the decrease in SoC. The red line shows actual energy depletion based on mechanical calculations. Due to variations in elevation and the effects of regenerative braking, the battery recharges at certain points, causing deviations from a perfectly straight line. However, the yellow dashed line represents the estimated remaining range, which follows a straight-line approximation for generalization. The graph shows a nearly linear trend, indicating a consistent energy consumption pattern throughout the trip. The estimated range based on SoC depletion closely aligns with the actual traveled distance, while the predicted range and energy depletion closely match real-world data, demonstrating the accuracy of the prediction model. This confirms that range estimation is reliable for trip planning, making it valuable for EV drivers.

4.2. Power Flow Analysis

The power flow analysis utilizes time-series load shapes for the 55 loads served by the test feeder, with a one-minute time resolution over a one-day period, enabling a detailed assessment of load variations and their impact on grid performance. Figure 10 illustrates the power profile of the Modified European LV test system, showing variations in power multiplier values (in kW) across different load profile nodes over a 24-hour period (measured in minutes). The 3D plot highlights fluctuations in power demand across the network. The X-axis represents the load profile across distribution nodes, the Y-axis captures power consumption dynamics over time, and the Z-axis indicates power demand intensity at specific nodes and intervals KW. The residential power consumption remains zero before 300 minutes, indicating minimal load before 5 AM. Identifying peak demand periods helps in implementing demand-side management strategies to enhance grid stability.

Figure 11 shows the variation of total power losses (in MW) over a 24-hour period. The red plot highlights the power loss trend, helping to analyze system efficiency and performance variations over time. A spike in power loss despite no load at feeder nodes before 1 AM could be caused by reactive power flow, transformer/core losses, leakage currents, or system imbalances. Factors like capacitor switching, no-load transformer excitation, or sudden voltage fluctuations may also contribute to these losses. The fluctuations in power losses indicate varying load conditions throughout the day after 6 AM, with noticeable peaks during certain time intervals.

Overall, the power loss plot from the load profile analysis provides insights into the variation of power losses over time, highlighting the impact of fluctuating load demand on the distribution system. Peaks in power losses correspond to high-demand periods, indicating increased stress on the network, while lower losses suggest periods of reduced load. Analyzing these trends helps assess system efficiency, identify potential congestion or inefficiencies, and optimize load management strategies to minimize losses and enhance grid performance.

4.3. Appliance Scheduling

Figure 12 illustrates the daily electricity consumption pattern of nine electrical appliances—fridge, dishwasher, microwave, water kettle, washing machine, radio with amplifier, dryer, kitchenware, and bedside light—over a weekday in Building1, a single-floor apartment in Klagenfurt occupied by a young couple who are mostly away on weekdays and spend evenings and weekends at home. Each appliance is represented by a different color, showing its electrical power usage in watts over time. The data reveals distinct usage signatures, where some appliances operate periodically with sharp peaks (e.g., blue), indicating cyclical or automated use, likely corresponding to devices such as a fridge, while others (e.g., pink, orange, and purple) display sporadic high-power consumption, suggesting short bursts of activity, which is typical of electric kettles, washing machines, dishwashers, and kitchenware. The naming format appears to be a MAC address-like device ID, commonly used in Zigbee-based smart home energy monitoring systems for wireless communication with a central hub. Among high-power-consuming appliances, 000D6F00029C2BD7, 000D6F0003562C48, and 000D6F000353AE51 correspond to the water kettle, dishwasher, and kitchenware (oven), respectively. The pink power pattern, with a short, high-power spike, aligns with a kettle used around 7 AM for breakfast preparation. The orange pattern, characterized by an initial high-power phase, a lower-power cycle, and a final high-power phase, corresponds to a washing machine, suggesting operation during off-peak hours to optimize electricity costs. The purple pattern, marked by an initial surge above 2 kW followed by a steady draw of about 200W, is typical of an oven, likely used for evening meal preparation, aligning with typical household cooking routines.

These distinct appliance signatures provide insights into daily household energy usage, helping to identify energy-intensive devices and opportunities for optimizing electricity consumption, such as shifting appliance use to off-peak hours or integrating smart energy management systems.

Furthermore, to recommend the optimum hours, we use rule-based descriptive analytics as presented in Section 3.3. The prerequisite criteria for appliance scheduling is the day-ahead price and follows a dynamic structure set daily by the energy market, and this study uses the same price data as in [11]. Based on the power ratings of household appliances, their operating durations, and the electricity tariff structure, the analysis suggests that the five optimum recommended hours for electricity usage are 2 AM, 3 AM, 4 AM, 1 AM, and 5 AM, in descending order. These hours likely correspond to off-peak periods, where electricity demand is lower, leading to reduced tariffs, making them optimal for operating high-power appliances such as washing machines, ovens, or water heaters to minimize overall energy costs.

4.4. Measurify Data Uploading

The experimental evaluation of the three energy IoT services aims at assessing reliability and applicability of the Measurify framework in managing heterogeneous sensor data across various domains. To ensure consistency in latency measurements and eliminate variability caused by network transmission, all tests were performed by deploying a local instance of Measurify directly on the host machine. This set-up avoids the influence of external communication delays, that depend on specific network configurations and hardware, and cannot be generalized a priori. All experiments were carried out on a mid-range laptop equipped with an 11th Gen Intel(R) Core(TM) i7-11800H @ 2.30GHz CPU, 16 GB of RAM, and an NVIDIA RTX 3050 Ti Laptop GPU. This hardware configuration represents a balanced and accessible development environment, suitable for evaluating lightweight IoT middleware like Measurify. In addition to performance metrics, Table 5 summarises the structural characteristics of the datasets used in the three domains, reporting the number of files, columns, total rows, and total file size. This comparison highlights the variety of the datasets and the scalability of the framework.

Using Jupyter Notebooks, we performed automated data uploading of the datasets (batch upload), and measured the average latency per file. Additionally, Docker Desktop tool was used to measure CPU and RAM utilization for each domain. Table 6 reports the average latency and resource usage observed during the experiments.

Results, presented in Table 6, highlight some correlations in the observed performance metrics. First, the observed latency per row depends on the number of columns in each CSV file. For example, the vehicular batteries dataset, despite its relatively modest size in rows, reached the highest latency due to its 38-column structure. In contrast, the LV test feeder dataset, with only 2 columns per file, had the lowest latency. However, in all tested domains, the measured latencies remain within the range of 90–190 microseconds per row, aligning well with the requirements of real-time processing scenarios.

RAM usage was mostly affected by the total number of rows, particularly in the HEMS dataset, which required more than 3 GB of memory. This is a natural consequence of bulk uploading and processing large time-series data. Anyways, this remains acceptable compared to the capacity of a 16 GB of RAM computer. CPU usage remains low and relatively constant in all applications, never exceeding 7% on average, confirming the lightweight nature of the Measurify architecture.

Beside testing real-time reception of the data, we also performed streaming tests by sending single measurements at controlled frequencies of 1 Hz, 10 Hz, 1,000 Hz and 10,000 Hz. Given Measurify’s fast response time (in the order of a few hundred microseconds), no performance degradation nor data loss was observed, even at the highest frequency. We omit results in terms of latency, CPU and RAM usage since they are similar to those in Table 6 for batch upload. These results further confirm the suitability of the framework for real-time monitoring, where handling of high frequency and low-latency data is essential.

Overall, the experimental results validate the suitability of a measurement-oriented approach for practical energy-related IoT applications. Measurify’s structured data modeling, RESTful architecture, and automatic schema validation allow for fast prototyping, efficient error handling, and seamless integration with real-world datasets. Its ability to operate within low latency and low resource constraints, demonstrated in these experiments under realistic workloads, confirms its potential for use in production-grade, real-time IoT systems.

4.5. Discussion

The experimental results demonstrate that Measurify is a robust and flexible platform for integrating and managing various types of IoT measurement data in energy-related applications. While the previous sub-section focused on low-level performance metrics, this discussion highlights the broader implications of adopting a measurement-oriented framework and compares Measurify with other state-of-the-art solutions.

Compared to general-purpose IoT architectures, such as OpenIoT, Web of Things, and commercial platforms like AWS IoT and Azure IoT, Measurify offers a lightweight, fully open-source solution that excels in flexibility and semantic clarity. As shown in Table 7, Measurify supports fine-grained modeling of field entities as RESTful web resources, which simplifies integration and encourages modular development. This design enables developers to focus on the application logic, while the framework handles data structure validation, access control, and real-time API exposure.

Unlike other platforms that prioritize high-level service interoperability or rely on tightly coupled vendor ecosystems, Measurify provides developers with full control over the data model and resource hierarchy. Its measurement-oriented paradigm, where domain objects, features, and measurements are explicitly defined, proves particularly well-suited to domains characterized by heterogeneous, high-frequency, and time-sensitive data streams, such as battery monitoring, power grid diagnostics, and smart home automation.

One notable advantage is the reduced development overhead. Thanks to its modular API design and automatic data validation mechanisms, Measurify supports rapid prototyping and minimizes the debugging effort. Our experience showed that developers can deploy structured applications within hours, rather than days, and seamlessly scale across multiple devices and sensors. Additionally, recent work described and tested the CSV-based workflow for data integration with MongoDB through Measurify, which improves flexibility and error handling compared to native mongoimport tools [29].

From a scalability perspective, Measurify successfully managed large datasets (including over 18 million rows) and high-frequency data streams (up to 10,000 Hz) without performance degradation. This confirms its potential as a foundational layer for real-time, data-intensive IoT services in the energy domain and beyond.

Nevertheless, the current study has some limitations. The experiments were conducted using a local instance of Measurify, and further validation in distributed or cloud-hosted deployments would provide more general insights into network-related scalability and multi-user performance. Additionally, while Measurify enables effective data modeling and uploading, advanced features such as automated analytics pipelines, anomaly detection modules, or predictive capabilities remain external to the framework and must be developed on top of its APIs.

In summary, efficient development of data-driven energy applications requires a tools, like Measurify, able to support accurate time-stamped measurements, flexible modeling, scalable real-time data handling, and easy, open deployment.

5. Conclusions and Future Work

As IoT energy data offers a huge potential for new services, suitable application programming interfaces (APIs) for visualization, querying and exploration, are needed for building powerful energy management applications. Open source IoT platforms promise to foster a broad range of IoT application services, on top of a hardware basis of various sensing and actuation devices. In this context, we have assessed the support to effective and efficient development by a state of the art measurement-oriented modeling and execution framework, such as Measurify. Modelling involves mapping the domain-specific field objects to the Measurify API’s resources. To validate the framework, we have chosen three energy domains, such as vehicular batteries, LV feeder and HEMS. Thus, we have modeled the three data sources and their measurement contexts onto the five essential resources (Thing, Feature, Service, Device, and Measurement) of Measurify, assessing its validity in supporting efficient development. Our experience showed that Measurify can seamlessly support a variety of IoT services, providing benefits in terms of effectiveness and efficiency, as its resources support a structured and modular approach to application modeling and development. As for future work is concerned, we argue that key improvements for an efficient measurement-oriented framework include effective data inputation and seamless integration of edge artificial intelligence, particularly unsupervised machine learning, leveraging the power of data, minimizing the labelling costs.