Input Voltage : 10V-15V/21V-30V Output voltage: AC 230V Frequency: 50HZ+2 Low battery alarm:10.5V+ 0.3V,21+0.5V Low battery shut down: 10V+0.5V 20V DC±0.5V Over voltage shut down: 15.5V+0.5V or 30.5V+0.5V Over load shut down :720W over 10 seconds Over heating shut down>75℃ Over Thermal :shut down the output Short Circuit: fuse Working Temperature: Between -10℃ and +50℃ Working Humidity: 20%~90%RH non-condensing Storage Temperature : Between -30℃ and +70℃