In short: How much you save with plug-in solar comes down to three things: how much sun your spot gets, how high your local electricity rate is, and how much of the power you use during the day. In a high-rate state like California or New York, a small kit bought at cost can pay for itself in about two years and then keep saving you money for decades, which works out to a return on your money on the order of 50% a year. Enter your zip code in our savings calculator to see you