You don't need to know the circuit to buy an inverter. If you understand these points, you won't make a mistake.

‍Many people are in contact with inverters for the first time, and they are at a loss when they look at the terms such as DC, AC, KVA and pure 

sine wave on the parameter list. When shopping, you either choose the cheap one only by looking at the price, and you can't bring the 

equipment back or even burn the load; Either blindly choose high-power models and increase procurement costs in vain. In fact, you don't 

need to be proficient in circuit knowledge, but you can quickly choose a reliable product that adapts to your own scene by grasping several 

core dimensions.

The first thing to be clear is the input and output voltage, that is, "what electricity is in and what electricity is out". Simply put, DC stands for 

direct current, which is the electricity output by batteries, storage batteries and photovoltaic panels, corresponding to the input side of the 

inverter; AC stands for alternating current, that is, daily household commercial power, corresponding to the output side of inverter. Make sure 

how many volts of DC your power supply is before purchasing. For example, 24V is commonly used for vehicle-mounted and small-scale 

energy storage, 48V is commonly used for communication rooms, and 110V or 220V； is commonly used for power scenes. Then confirm how 

many volts of alternating current the load needs. Most domestic equipment is 220V, and some industrial equipment will use 110V V.. Choosing 

the corresponding voltage level can meet the most basic adaptation requirements. As for the details such as cut-off voltage and start-up voltage, 

regular manufacturers will calibrate them according to the battery characteristics without additional calculation.

The second is power matching, which is the easiest part to step on the pit. The KVA marked on the inverter parameters is the apparent power, while 

the electrical power "W" we usually say is the active power. For a pure sine wave inverter, it is usually converted by a power factor of 0.8. For example, 

a 1KVA model can drive about 800W resistive load. When purchasing, it is suggested that the sum of the rated power of all the equipment to be 

taken should be counted first, and a margin of 20%~30% should be reserved on this basis. Pay special attention to the inductive loads such as 

refrigerator, water pump and motor, which will generate several times of impact power at the moment of starting, and the margin needs to be more 

sufficient to avoid triggering overload protection when starting.

The third point that is easily overlooked is the selection of output waveform. At present, the inverters on the market are mainly divided into two types: 

modified wave and pure sine wave. The price of correction wave is low, but it can only drive simple resistance loads such as light bulbs and heating rods. 

When it is used to bring computers, precision instruments and motor equipment, it is easy to cause abnormal noise, interfere with signals and even 

damage equipment. The waveform of pure sine wave output is completely consistent with the commercial power, which is suitable for almost all AC 

appliances, running smoothly, with low noise and being more friendly to equipment. Although the unit price is slightly higher, it is applicable to a wider 

range of scenarios and has lower use risk. Pure sine wave models are preferred in most scenarios.

In addition, the adaptability of protection function and scene is also very important. Qualified industrial inverters will be equipped with basic functions 

such as DC reverse connection protection, input overvoltage and undervoltage protection, output overload and short circuit protection, and over-

temperature protection, which can effectively avoid misoperation and abnormal damage to equipment in the power grid. Battery compatibility also 

needs attention. High-quality models can simultaneously adapt to various energy storage types such as lithium batteries, lead-acid batteries, colloidal 

batteries, nickel-cadmium batteries, etc. No matter whether it is a new project or an old station renovation, it can directly connect the existing battery 

packs and reduce the renovation cost. For unattended scenes such as communication base stations and outdoor cabinets, it is also necessary to confirm 

whether it has the self-start function of mains power recovery. After troubleshooting, the equipment can automatically restore power supply without 

manual operation.

Finally, for customers who purchase in bulk in industry and computer rooms, communication operation and maintenance capabilities also need to be taken 

into consideration. The models with RS232 and RS485 interfaces and passive dry contacts are standard, which can be directly connected to the dynamic ring 

monitoring system, remotely check the operating data such as voltage, current, temperature and load rate in real time, and give an active alarm for faults. 

If there is a need for network management, SNMP network management module can also be selected to realize unified background management and 

control of multiple devices, greatly reducing the cost of operation and maintenance inspection.

Choosing an inverter is never "the more expensive the better", but the core is to accurately match its own power supply conditions, load types and usage 

scenarios. Baoweite's full range of pure sine wave inverters cover all voltage inputs of 24V, 48V, 110V and 220V, and the power range is from 1KVA to 60KVA. 

It comes standard with a full set of protection mechanisms and communication interfaces, supports customized parameter adjustment, and can meet the 

power supply needs of multiple scenarios such as household emergency, commercial stalls, industrial production and communication rooms.

If you need type selection and transformation, you can consult Baoweite for the scheme. Thank you for browsing. You can collect official website of Shenzhen 

Baoweite Power Supply Co., Ltd.

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