How to choose inverter for household photovoltaic system

Household photovoltaic systems generally consist of photovoltaic components, solar controllers, batteries, inverters, and loads. Photovoltaic components convert solar energy into electrical energy when there is light, and use the solar controller to supply power to the load and charge the battery pack at the same time; When there is no light, the battery pack supplies power to the DC load through the solar controller, and the battery also needs to be inverted into AC power through the inverter to supply power to the AC load.

In household photovoltaic systems, the direct output of solar energy is generally 12VDC, 24VDC, 48VDC. In order to provide electrical energy to 220VAC electrical appliances, the DC power generated by the photovoltaic power generation system needs to be converted into AC power, so a DC-AC inverter is required. Device.

The main function of the inverter is to convert the direct current from the photovoltaic modules into alternating current. In addition, the inverter also undertakes important functions such as component detection, communication with the outside world, and system safety management. Therefore, the choice of household inverters is very important.

1. Configure a safe and reliable DC switch

The situation of household power stations is very complicated and the location is relatively remote. Once the components are short-circuited and grounded, they cannot be arrived immediately after sale. Fire or electric shock may occur. At this time, the owner can directly disconnect the DC switch to avoid further escalation of the fault.

2. Minimize the noise

Household photovoltaic inverters are installed in residents’ homes. If noise is generated during operation, it will bring great inconvenience to people’s lives. The sound of the inverter comes from fans and inductors. The inverter should be designed without a fan. There are no fans, eliminating the biggest noise source. The inductor is filled with glue as a whole and placed in an aluminum case separately to reduce the inductor’s current and vibration.

3. Adopt a variety of display methods

It is necessary to have an LCD display screen, which is intuitive and convenient for users who do not have a smart phone to view. The GPRS monitoring method is also used to monitor the operation of the power station with a smart phone, which can be checked anytime and anywhere, and problems can be dealt with in a timely manner.

4. High power generation

There are many factors that affect the amount of power generated by the inverter. The first is that the inverter must be stable and cannot be broken, because once the inverter fails, it needs to be repaired or replaced. It will take as little as two or three days to as many as five or six days. During this period, the electricity bill will be lost. Very big.

The second is the efficiency of the inverter. The three efficiencies of the inverter, the maximum efficiency, the weighted efficiency and the MPPT efficiency, have the greatest impact on the power generation is the weighted comprehensive efficiency, because the inverter works under the rated power for the most time of.

The third is the DC working voltage range. The wider the voltage range, the early start and late stop. The longer the power generation time, the higher the power generation.

Fourth, MPPT tracking technology must have high accuracy, fast dynamic response, and can adapt to sharp changes in light and improve power generation efficiency.

Fifth, the inverter output voltage range should also be wide, preferably between 180-270V, and of course it should not be too high. Exceeding 270V will have an impact on household appliances.