I hope you didn't buy one of these units the biggest problem with these power hungry units it the idle power consumption i have the 3/9kw unit 12 volt idle power 9 amps or 108watts idle 48 volt unit 228 watts idle and if the unit stuffs up good luck in getting the parts , the unit doesn't work to good in areas above 35 Celsius, the unit needs extra cooling fans , the main board blew up on mine , the most power been used at the time was 200watts now waiting for the main board replacement and still waiting Stay clear of these units, one thing good is i live in the country we only have 1 fm radio station all the rest are relayed am weak station and these units do not cause radio interference were all the other i have tested wiped the am band out one inverter intererfered with radios 150 meters away people were not happy lol