Here is the scenario. Foundation for the house 28' x 49' to build on....just under 1400 sq. ft. One story simple design. Climate in zone 3 northern Minnesota latitude Limit funds for rebuilding to $50,000 on the prepared foundation. Grid power is available within 100ft. to hookup. but the desire is to go solar/wind power or combination thereof. Needs for power consumption (minimal): deep well pump the usual electonics....computer, 27" t.v., small stereo system 200 watts maximum, , kitchen 800 watt microwave, occasional use of kitchen appliances such as power mixer, oven and burner possible propane if power consumption for off-grid is too great dishwasher?...maybe not feasable for off-grid?) furnace blower motor (hot water tank and heat from outside wood furnace) room lighting I'm guessing the setup to go off-grid somewhere about $15,000. Would you also do a grid hookup? ...which might be about $1000 or less? Hydro (electicity) bills average about $150 mo. Figure by off grid power use would decrease the hydro bill (or eliminate if if no hydro was hooked in) by about $100/mo. .....that's about $2500/yr.....thus, payback for going off-grid about 7 or 8 years. Batteries warranty of 15 to 20 years before need of replacement. Am I missing something, or is this projections out to lunch?