Hi I use this inverter for the past one year. So far its very good. It keeps the battery charged very fast and it helps alot to keep the battery backup pretty well. And when the power goes down it jusy take fraction seconds to switch from electric power to battery power which helps me a lot to keep my devices on without going down. My internet modem have never and ever went down when there is power down and when it is switching to the battery power. Very good product. Its highly recommend for IT people.