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Household photovoltaic system how to choose the inverter?
- Jun 28, 2018 -

The main function of the inverter is to convert the DC power from the PV modules into AC power. Since the inverter is the only device with “wisdom” in the PV system, in addition, the inverter also carries the test components, power grid, and cable operation. State, communication with the outside world, system security, housekeeping, and other important functions. Then, what should pay attention to the selection of household inverters?

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1 Configure a safe and reliable DC switch

The situation of household power stations is very complex and their locations are relatively remote. Once the components are short-circuited and grounded, they cannot be reached immediately after the sale, and there is a risk of fire or electric shock. This allows the owner to disconnect the DC switch (this operation is very simple). Avoid further upgrades.

2 Minimize noise

Household PV inverters are installed in residents' homes. If noise is generated during operation, it will cause great inconvenience to people's lives. The sound of inverters comes from fans and inductors, and the inverters are fanless. There are no fans inside and outside to eliminate the largest source of noise; the entire inductor is potted and put into a single aluminum enclosure to reduce the current and vibration of the inductor.

3 Take a variety of display methods

Need to have LCD display, intuitive and convenient, suitable for some users without a smart phone to view, physical button life is short, voice-activated button operation is simple, longer life; using GPRS monitoring, using smart phones to monitor the power station running, can be anywhere, anytime Viewing can manage thousands or even tens of thousands of power stations in a unified way. The two-way monitoring system can provide active services, discover problems, early warning of faults, and remote diagnosis and processing of problems.

4 High power generation

There are many factors that affect inverter power generation:

1) The inverter must be stable and cannot be damaged, because once the inverter fails to be repaired or replaced, the electricity cost will be very high.

2) The efficiency of the inverter, the three efficiencies of the inverter, the maximum efficiency, the weighted efficiency, and the MPPT efficiency. The weighted total efficiency is the one that has the greatest impact on the power generation because the inverter operates at a time lower than the rated power. of.

3) DC operating voltage range. The wider the voltage range, it means early start and stop at night. The long time of power generation, the higher the power generation.

4) The accuracy of MPPT tracking technology is high, and the dynamic response speed is fast. It can adapt to sudden changes in light and improve the efficiency of power generation.

5) The output voltage range of the inverter should also be wide, preferably between 180-270V, and certainly not too high, exceeding 270V will affect the home appliance.