If you can, do it, especially if you have decent exposure. My 535KW panel installation has a ESE exposure and I still do fine. I'm divorced and don't use the electric oven or clothes dryer very much. I haven't had an electric bill since installation in 2012. Also, since 2012, solar panels have really come down in price and I believe there is still a federal tax credit. I got 30% off the price.