1.1KVA TO 6KVA 2. Inside 12v 7ah 9ah 17ah battery 3.Pure sine wave. 4.Low frequency, inbuilt transformer. 5.Avr function 6.Charge current max.20a. 7. Support inductive load, motor, generator. 8. Input range: 145-275vac 9. Output: 230vac+/-10% 10. Rs232 available 11. Led/lcd panel available 12. Transfor time: 3ms 13.Protection: automatic self-test, discharge protection, over charging protection, short-circuit protection.Low voltage, over voltage, over load, over heating protection etc. Carton box