The main function of the PV inverter is to turn the DC power from the PV module into AC power, as the inverter is the only device with “wisdom” in the PV system, in addition, the PV inverter also undertakes important functions such as detecting the operating status of the module, grid and cable, communicating with the outside world, and system safety housekeeping. So, what should I pay attention to in the selection of household PV inverter?
1, the configuration of safe and reliable DC switch.
Household power station situation is very complex, the location is also relatively remote, once the components occur short-circuit grounding and other phenomena, after-sales service can not immediately arrive, there may be a fire or electrocution accident, then you can let the owner disconnect the DC switch (this operation is very simple), to avoid further escalation of the fault.
2、Minimize the noise.
Household photovoltaic inverter installed in residential homes, if the noise generated in operation, will bring great inconvenience to people’s lives, the sound of the inverter from the fan and inductor, the inverter to adopt a fanless design, no fan inside and outside, to eliminate the largest source of noise; inductor overall gluing, and put into a separate aluminum-cased case to reduce the current and vibration sound of the inductor.
3. Adopt multiple display modes.
Both LCD display, intuitive and convenient, suitable for some users who do not have smart phones to view, physical buttons have a short life span, voice-activated buttons are simple to operate and have a longer life span; adopt GPRS monitoring, monitor the operation of the power station with smart phones, can be viewed at any time and anywhere, can unify the management of thousands of units or even tens of thousands of power stations, two-way monitoring system can provide proactive services to find problems, fault warning, the problem remote diagnosis and processing functions.
4, high power generation: Inverter affects the power generation of many factors, need to pay attention to.
First is the inverter to be stable, can not be bad, because once the inverter failure to repair the machine or replace, as little as two or three days, as much as five or six days, during which the loss of electricity costs a lot.
The second is the efficiency of the inverter, the three efficiencies of the inverter, maximum efficiency, weighted efficiency and MPPT efficiency, the greatest impact on power generation is the weighted combined efficiency, because the inverter works at less than the rated power is the most time.
Third is the DC operating voltage range, the wider the voltage range, representing the early start and late stop, the longer the power generation time, the higher the power generation capacity.
Fourth, the MPPT tracking technology should have high accuracy and fast dynamic response, which can adapt to rapid changes in light and improve power generation efficiency. Fifth, the inverter output voltage range should also be wide, preferably between 180-270V, but of course not too high, more than 270V will have an impact on household appliances.