build-in short-circuit protection,open-circuit protection,reverse protection,over-load protection.

peak power: 4000w continuous power: 300w led battery power display input voltage: 12v output voltage: ac 110v /220v (optional) voltage: dc 12v/24v rated charge current: 30a floating charge voltage: 13.7v (adjustable) end-off voltage: 10.7v (adjustable) discharge recover voltage: 12.6v (adjustable) usb output: 5v/3a 12v is generally for cars, 24v for trucks, 48v and 60v is generally for electric vehicles. - available range of rated voltage of electrical appliances : 200~240v, 100~120v