Pure Sine Wave Inverter For Wind Solar System 1000W 48V,Output Frequency 50Hz/60Hz,Maximum efficiency >90%,Power factor >99% ... you and protect the inverter from being damaged automatically. Over 100%-120%, inverter shuts down 30s later, over 150%, inverter ... circuit protectingInverter when the output short circuit shut down the system automatically restart in one minute, three failed to start, ...