The cheapest type of solar is solar thermal. You can get a solar thermal system for a family of 2-3 for $5000. This typically can be paired with a 40-60 gallon tankless water heater. That price is before tax incentives roll in. First you have the federal tax credit of 30% and then if you state offers any rebates or credits then the price will drop even more than that! Check out the first link to see if your state or local utility company offers any incentives for solar thermal.
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