I installed a solar system in 2017, 8100 watt size, ground mount. It covers half of our utility costs which include a heat pump, electric furnace back up, electric clothes dryer and water heater. Total cost was $29,000, so just a little over $1000 per panel. I received a 30% tax credit as well as $12,000 in incentives which expired in 2021. In Olympia our electricity costs about $.011 per kwh. We pay $7.49 per month for about 6 months a year because of our summer production and still have some banked to offset some of winter heating costs. I decided on buying the solar system rather than buying a new car, both the solar panels and my 2010 Subaru are running just fine, I feel like I am ahead of the game. The smartest thing I did was going with a ground mount, much easier to clean and service. And at age 72 I have no business being on a roof.