... back up UPS Built-in with 10Amp charger for up to 100Ah batteryFull protectionProtection for low battery voltage,over ... example:DVD, Fan,TV etc)Technical parameter of LCD UPS Inverter RT2020 500 VA-2000VAModelRT2020 500-2000VA500-121000-122000 ... Status, Input/output Voltage and Frequency, Load, AC,battery ,fault, etcOperating EnvironmentTemperature0°C~40°CHumidity5%~95%(<40°C ...