Quote Originally Posted by batgirl
I'm using an insulated 8 x 10 shed with a large roof fan. I'm going with 2 systems, either 600w or 1000w HPS, haven't decided yet. Will need heat in the winter. How much power do I need? I was thinking 20 amps, but someone told me that with HPS I need more.
Hey Batgirl,
A single 1000 watt HPS draws about 1150 watts depending on your ballast efficiency if it's electronic or magmetic. 1150 watts is @ 120v is 9.6 amps so you only going to be able to run 1 1000 and 1 600 plus all your fans etc. on a 20 amp circuit.