hi there im new round here too pleased ta meet yas cant really answer your questions ,only very small time entered into the growing game had to get out due to circumstances beyond my controllbut i ran a 250 watt hps, 2 outake fans and a desktop fan off a extension cable rated at 800 watts max i think? with no bother at all quess that dont help much maybye you could look around for an extention lead with a really high max watt rating and work it out from there :anyway good luck with your venture hope all goes well for you ..and its bloody dry here at the mo take care bro