The home photovoltaic system is generally composed of photovoltaic modules, solar controllers, batteries, inverters and loads. The photovoltaic modules convert solar energy into electrical energy under the condition of illumination, supply power to the load through the solar controller, and charge the battery pack at the same time;
When there is no light, the household solar photovoltaic supplies power to the DC load from the battery pack through the solar controller, and the battery is also converted into AC power through the inverter to supply power to the AC load.
The direct output of solar energy in household photovoltaic systems is generally 12VDC, 24VDC, and 48VDC. In order to provide electrical energy to 220VAC electrical appliances, it is necessary to convert the DC power generated by the photovoltaic power system into AC power, so a DC-AC inverter is required.
The main function of the inverter is to convert the direct current from the perc pv modules into alternating current. In addition, the inverter also undertakes important functions such as detection of components, communication with the outside world, and system security management. Therefore, the choice of household inverters is very important.
The situation of the home power station is very complex and the location is relatively remote. Once the components are short-circuited and grounded, the after-sales service cannot be rushed, and fire or electric shock may occur. At this time, the owner can directly disconnect the DC switch to avoid further escalation of the fault.
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 adopt a fanless design. There is no fan inside and outside to eliminate the biggest noise source. The inductor is filled with glue as a whole, and an aluminum case is placed separately to reduce the current and vibration sound of the inductor.
It is necessary to have an LCD display screen, which is intuitive and convenient, and is suitable for some users who buy solar products but do not have a smartphone to view it. It is also necessary to use the GPRS monitoring method to monitor the operation of the power station with a smartphone
There are many factors that affect the power generation of the inverter. First, the inverter must be stable and not broken, because once the inverter fails, it needs to be repaired or replaced, ranging from two or three days to five or six days. During this period, the electricity bills lost a lot of money.
The second is the efficiency of the inverter, the maximum efficiency, the weighted efficiency and the MPPT efficiency. The weighted comprehensive efficiency has the greatest impact on the household solar photovoltaic power generation, because the inverter operates at a lower power than the rated power for the most time.
Then there is the DC working voltage range. The wider the voltage range, the earlier the start and the later stop, the longer the power generation time, the higher the power generation.
Furthermore, MPPT tracking technology has high precision, fast dynamic response, can adapt to rapid changes in light, and improve power generation efficiency.
Finally, the output voltage range of the inverter of the photovoltaic system should also be wide, preferably between 180-270V, of course not too high, over 270V will have an impact on household appliances.