do the math... not 500 to 1000
I have a 400 watt Harbor freight inverter ... for 32 inch Samsung TV flat screen,, Directv satellite receiver box with recorder... 2 laptops... 1 smart phone, 1 flip phone, 1 8 inch tablet for internet and such..
and I am not using 250 watts. but I never charge or use them all at the same time.
I have it mounted next to the power panel... where the main wires from battery enter the fuse box... and wire it there using the supplied wires with inverter... then 120 volt cable to TV/satellite, then another one for electronics.