1. Accuracy of your electricity meter

One of the most important factors to consider is accuracy class, which ensures that your meter meets your needs. Accuracy class indicates how accurately a meter measures energy consumption. These classes, usually Class A (Class 2.0) and Class B (Class 1.0), are determined by international standards such as the IEC (International Electrotechnical Commission) and MID (Measuring Instruments Directive) and define the accuracy of a meter.

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Class A meters, with a margin of error of up to ±2%, are ideal for situations where affordability and simplicity are essential. These meters perform well in simple residential environments, temporary installations such as construction sites and rural areas where high precision is not crucial. Industries such as agriculture and small businesses often prefer Class A meters because of their cost-effectiveness in tracking energy consumption without requiring absolute accuracy.

Class B meters offer accuracy within ±1% for more demanding applications, making them applicable for residential billing, commercial buildings and detailed energy audits. Industries such as manufacturing, utilities and renewable energy rely on these highly accurate meters to manage costs, optimise energy consumption and improve performance. For example, in solar or wind installations, Class B meters ensure accurate billing and compliance with energy standards, while in commercial buildings, they can identify opportunities for significant energy savings.

By understanding the importance of accuracy class, you can find the perfect balance between cost, performance and application-specific requirements.

2. Compliance

When choosing an electricity meter, it is important to understand the certifications to ensure compliance, reliability and accuracy. One of the most important is MID (Measuring Instruments Directive) certification, which is mandatory in the EU for meters used for billing. MID certification ensures that the meter meets strict accuracy, reliability and consumer protection standards. There is also the CE mark, a declaration that the product meets EU safety, health and environmental requirements, making it suitable for the European market. In addition, IEC standards, such as IEC , provide a global framework for data communication in electricity meters, facilitating international interoperability and reliability. Certifications such as RoHS and REACH ensure environmental safety by restricting hazardous substances and regulating the handling of chemicals.  

Region-specific regulations, such as Eichrecht in Germany, play a crucial role in ensuring the precision and transparency of energy measurements, especially in emerging areas such as electric vehicle charging stations, where calibration laws are key for consumer confidence. Specialised certifications, including UL for North America and EMC for electromagnetic compatibility, provide additional safety and performance assurance. Although not always mandatory, certifications such as CMC or CIC demonstrate superior calibration and quality. By prioritising these certifications, you can rest assured that your meters meet the highest legal, safety and performance standards.

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3. Single-phase or three-phase?

Understanding the distinction between single-phase and three-phase systems is crucial to ensure a meter aligns with your power requirements. A single-phase electricity meter is designed for single-phase power systems, which consist of one phase conductor and one neutral conductor. These systems are usually used for lower power requirements, making them ideal for residential homes and small businesses where appliances, lighting and heating operate efficiently on single-phase power. Due to their simplicity, single-phase meters are also easier to install and maintain, perfect for uncomplicated applications.

A three-phase electricity meter measures energy in three-phase electricity systems with three phase conductors and one neutral conductor. These systems are designed for higher current requirements and provide a stable, efficient power supply. They are often used in industrial environments, large commercial buildings and applications with high power requirements, such as HVAC systems and heavy machinery. Three-phase systems are also more efficient for transmitting power over long distances, making them essential for large-scale power distribution.

Therefore, the choice between single-phase and three-phase meters depends on your specific power needs: single-phase meters are for smaller, simpler setups, and three-phase meters are for robust, powerful applications.

4. Communication protocols

The communication protocol of an electricity meter is an important factor to consider as it determines how it communicates with other devices or networks for data collection, monitoring and management. Communication protocols enable meters to transmit consumption data to utilities or third-party systems, enabling accurate billing, real-time monitoring and efficient energy management.  

The choice of communication protocol often depends on the 'main system' or device that will communicate with the meter. The main system may be a utility's central management system or an energy management platform, and the protocol must be compatible with it to ensure seamless data exchange. Several communication protocols are available, such as Modbus, often used in industrial environments for connecting meters to controllers; DLMS/COSEM, a global standard for smart grid and AMI applications; M-Bus, ideal for multi-utility meters such as water and gas; and wireless options such as Zigbee or LoRaWAN, which provide low-power, long-range connectivity for smart homes or large-scale infrastructure. Mobile communication protocols such as GPRS or 4G are also used for remote metering in areas without local networks.

5. Durability and environmental considerations

Think of buying an electricity meter as a long-term investment. Therefore, choose a model with proven performance, low maintenance and a reliable warranty. The placement of the meter is just as important - whether the meter is indoors or outdoors, it must be durable enough to handle various environmental conditions such as dust, humidity and extreme temperatures.  

This is where IP (Ingress Protection) classification is critical. The rating indicates the meter's level of protection against solids (such as dust) and liquids (such as water). An IP rating consists of two digits: the first indicates protection against solid objects, and the second is against liquids. For example, an IP54 rating means the meter offers medium protection against dust and can withstand water splashes from all directions. For indoor use in dry, clean conditions, an IP20 rating may be sufficient, while an IP67 rating is suitable for harsher outdoor environments, including brief immersion in water. In industrial environments, an IP65 rating ensures the meter is dustproof and protected from water jets, making it ideal for harsh conditions.

6. Scalability and future-proofing

Future-proofing your investment is also something to consider when selecting an electricity meter. Therefore, choose expandable models to scale up the system quickly as energy demand increases or add more meters as needed. As the shift to renewable energy accelerates, you should look for meters that are bidirectional and can be integrated with solar, wind or other green energy sources to make managing different power sources smoother. With the increasing popularity of electric vehicles (EVs), it is also wise to choose meters that can seamlessly connect to EV charging networks, support dynamic pricing and handle the higher loads typically required for EV charging. In addition, meters with remote monitoring capabilities should be considered to enable real-time data analysis and more efficient energy management. Choosing a meter that adapts to changing energy needs, integrating renewable energy sources, and the rise of EVs will ensure that your system remains efficient, scalable and future-ready.

By selecting the right electricity meter, you meet both short-term needs and long-term growth. In addition to the above considerations like expandability, accuracy, certification, and environmental factors, you should also include cost and energy efficiency to ensure that the meter is affordable and economical. The size of the meter also matters to ensure it fits into the available space, while the method of mounting, such as on a DIN rail, can also be a factor of choice. By weighing these options, you can make an informed choice that meets your current and future needs.  

inepro Metering offers an extensive portfolio of electricity meters to help you manage your energy consumption. If you have questions or want more information about our metering solutions, please use the contact form.

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Van life is all about freedom, but comfort matters too—especially when temperatures rise. A good air conditioner can mean the difference between a cozy night and sweaty hours of misery.

This article discusses how to choose, power, and optimize an AC unit for your van in a way that fits real-world travel needs.

Keeping a van cool presents a very different issue from keeping a house cool. Vans are smaller internally, have less insulation, and no power hook-up.

While home AC units can run endlessly from the mains, van devices need to employ portable power mechanisms that need to be designed meticulously.

Heat builds up very quickly in metal vehicles like vans, and cooling needs to be small, efficient, and silent.

You also have to take mobility into consideration—your system has to work in remote locations with no connection to shore power.

All of this means that choosing a van AC is not just about cold air—but also about energy use, control, and integration with your off-grid system.

Cooling a van is not a case of finding the most powerful air conditioner—it's finding a system that will suit your power set up, space, and driving habits. The following are the three most common types of van-capable air conditioners, what they are, how they work, and what to consider when using them.

This is a portable air conditioner equipped with built-in rolling casters and an adjustable exhaust hose. It is mounted in the van and vents hot air out through an open gap in a door or window. Most of the models also include a condensation tank. Understanding how long portable air conditioners can run continuously is essential for planning overnight cooling in your van.

• No permanent modification to the van is required

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• Flexible to install, move, and store

• Smaller in initial cost in relation to fixed systems

• Takes up space in the van and restricts mobility

• Needs special outlet for venting hot air

• Some have manual draining of built-up water

• Inverter: High-quality pure sine wave, W minimum

• Battery bank: 300–500Ah recommended

• Exhaust setup: Hose should exit through a sealed window panel or door insert to maintain insulation and airflow efficiency

Each of these systems comes with a trade-off. DC split units are cost-efficient but costly. Rooftop ACs are high-powered coolers but power-hungry. Portable units are easy to install but less space-conscious. Regular air conditioner maintenance is essential for any type you choose to ensure optimal performance and longevity.

Understanding how much energy your AC setup might consume over time helps you plan your battery size more accurately. The table below shows typical running wattages, startup surges, and a recommended battery capacity for about 4 hours of use.

These numbers include some buffer for inverter loss and environmental factors, so you’re not caught off guard in real-world conditions.

EcoFlow’s portable power solutions are designed for real off-grid use, including running air conditioners. For van setups, models like the DELTA 2 Max or DELTA Pro offer the power capacity and flexibility to make cooling practical on the go.

Example: Running a 400W DC AC for 4 hours

• DELTA 2 Max (Wh): Typically supports 4 hours of runtime with a 400W DC AC

• Expandable to Wh with add-on batteries

• Charge in 1–2 hours from AC, solar, or alternator

• Pure sine wave output: Handles AC startup safely

• Solar-ready: Pair with portable panels while camping

For more demanding systems like rooftop 110V ACs:

• DELTA Pro (Wh, expandable to 25kWh): Built for high-surge loads and long-duration power

• Can run a W AC for 3 hours or more

• Works with solar input up to W

These stations are ideal for van owners who want serious power without permanent wiring or bulky setups. You can move them between van, cabin, or garage—no tools required. It’s a setup that fits wherever you end up.

A: It’s possible, but rarely practical. Window ACs are bulky, require custom mounting, and often compromise insulation and security when installed through a window or wall cutout. They typically run on 120V AC and draw high power, which makes them difficult to support with a battery system.

For most van setups, rooftop or DC-powered units are a better fit for off-grid use.

A: DC split units are generally the quietest. They have lower fan noise and smoother compressor cycles than rooftop or portable units.

Some high-end rooftop models have sleep modes, but most still run louder than DC-based systems.

Always check the decibel (dB) rating before buying if you plan to sleep while it runs.

Contact us to discuss your requirements of ups power. Our experienced sales team can help you identify the options that best suit your needs.