Well I only had to use it for a couple hours but it ran my tank my fridge, a fan and my TV
For my tank I ran two Reef flow Darts, my ASM G3, and one of my 3MH lamps....(400W). I'm pretty sure I could have fired the other two MH's(250watt) and been fine but I didn't want to push it....
I hope everyone's tank is doing well!!!
Adam