solar calculator — enter your ZIP code and electricity bill, and it returns your recommended system size in kW, the number of panels, the roof area you need, the gross install cost, the annual savings, the payback period, the 25-year lifetime profit, and. The all-in-one U. A 50 kW solar plant typically includes: The cost may cover equipment, installation, permitting, and grid fees. Built on. But this report breaks down how solar panels help you save thousands of dollars. The site calculates your approximate total savings. Understanding the true costs, potential savings, and calculating your return on investment accurately is crucial for making an informed decision. This comprehensive guide provides everything you need to. The upfront price for an average-sized residential solar system has fallen from $40,000 in 2010 to about $25,000 today. Meanwhile, utility-scale solar now costs between $24/MWh and $96/MWh, making it competitive with all other types of energy generation.