True and noise waveform off the degree of photovoltaic power systems and networking -type photovoltaic power generation system inverter control function is also very major skills .

( 1 ) should have enough additional output capacity and load order . Inverter selection, from the primary thinking has enough extra capacity to meet peak load requirements of electric power equipment . Load on a single device for the inverter , the extra capacity extractor relatively simple, when electrical equipment is purely resistive load orDC AC power inverters power factor greater than 0.9, the extractor additional ca pacity inverter power equipment capacity from 1.1 to 1.15 times can be. To multiple devices in the inverter when the load capacity of the inverter to disconnect the electrical equipment is also thinking about a few tasks Off grid inverters  can , ie \ load also factor \ .
( 2 ) should have a higher voltage constant function. In the off-grid PV systems are battery energy storage devices. When the nominal voltage of 12V battery in the form of a floating charge , terminal voltage up to 13.5V, the short time overcharge shape up 15V. When the battery terminal voltage with load discharge end can be reduced to 10.5V or less. The terminal voltage of the battery is about 30% of nominal voltage up to the rugged