... reverse: yes Short circuit protection and no spark clamps Thermal and current overload protection Automatic switch and transfer time: AC line to ... , 4.4A Output power (peak watts): 2,000W Output frequency range: 50 or 60Hz Output waveform: modified sine wave Low-battery ... : 20A x 6, standard auto blade fuse (internal) Efficiency range: 85 to 90% Thermal shutdown: 65, ±5°C Cooling fan: yes auto ...