It worked very well. The last power inverter I had purchase was years ago and worked well. Back up is really great. I found the Luminous Zelio 1100 VA affordable per watt along with some nice features that my previous 1000 watt inverter did not have. The unit has a cooling fab which monitors the temperature and starts and turns off automatically. The unit also provides us with the time required for a full charge and backup time with the current battery hold.