Photovoltaic is glamourous but the least economic form of renewable energy.   Currently, renewable energy accounts for 6% of the total energy in the USA, and photovoltaic only accounts for 1% of the renewable energy.    Projections show that hydro, and geothermal are flat while biomass and wind are increasing.   Photovoltaic is actully declining.    According to Global Solutions 76% of new reneable energy will come from wind in the next 15 years.   In Michigan we only got an 18% capacity factor from our solar plants.

Have you considered a windmill?   McKenzie Bay makes a 66 foot 100 KW windmill with a 30% capacity factor. (very good for windmills)   They install and maintain the windmill and than sell you the electricity.   Gary Westerholm is their president.   Check out their web site.

I think the best investment you could make is a geothermal heat pump with an energy star (86 HERS rating) or better. I prefer blown cellulose insulation- same cost as fiberglass but much more effective.   I used to say 40% more effective but the Department of Energy (Oak Ridge Laboratory testing facility) got mad at me and asked that I stop saying it.   They used to claim it was 40% more effective but have now backed off somewhat. Nevertheless- cellulose it a better insulator, fire retardant, insect repellant, and a better sound prooer.   Fiberglass batts are never installed properly

I would make sure my house had R49 in the attic, R21 in the walls, an ICF or SIP basement, low e coated windows, and no more than 35% air changes per hour.   That will use far less energy and cost a whole lot less than photovoltaic.