The Freedom XC PRO 2000 is a true sine wave 120 Vac inverter/charger with a built-in transfer switch. It delivers 2000 watts of continuous power and has a 4000 watt surge capability for up to 5 seconds. This unit supports charging of lithium-ion batteries and can charge dead batteries down to 0V. The inverter/charger operates at full output from -4°F to 104°F (-20°C to 40°C).