nice generator at costco 199.00 1200watt gas 90amp. it is running my system 2x500wattmhx2 55watt pc's 600gph refugium pump,235gph pump for the chiller, protein skimmer,doulble whisper air pump,300gph pump for overflow,200watt heater,aquaclear 500gph power filter. it says it can go to 1500watts,i guess it is true.