Specs 20-30 V model Output Power 2 Minutes: 5500 Watts Output Power Continuous: 5000 Watts Output Power Surge: 7500 Watts AC Output Voltage: 100.....240 VAC Regulation: +/- 0.5% Output Wave Form: Modified Sine Wave Phase Correction DC Input Voltage: 20-30 V Low Battery Alarm: 21.5 V Low Battery Shut Down: 20 V Frequency: +/- 1% 60 Hz 50HZ Efficiency: 90% No Load Current Draw: 0.5A Over Temperature Protection: 55 c +/- 5 c Cooling Fan: Yes Overload Protection: Yes Input Short Circuit Protection: Yes Dimensions(L x W x H): 696 x 243 x 186 mm Net weight: 12.5 Kgs Remote power monitoring Yes Remote generator switching No More specs: -Battery charging with temperature compensation There is no sensor taking the battery temperature (This can be misleading due to other outside factors) Temperature is taken by first sending a signal through the battery to measure resistance, another signal is sent for measuring battery capacity, then another signal to measure actual charge and consumption rate. After all of these parameters are taken in consideration the temperature coefficient is determined automatically within 2 degree accuracy. After the calculation, a charge is sent to the battery according to the need at that given time. A pulse is sent first to clean ions stuck in the plates then a steady voltage is applied.