Solar Panel Savings Calculator

It's a placeholder signaling the system's cumulative savings never crossed back above zero within the full 25-year projection — not a literal timeframe. Seeing that figure usually points to an unusually high system cost relative to production, a low electricity rate, or some combination that makes the numbers as entered a poor investment case, worth double-checking against your actual installer quote.

Electricity Price Inflation compounds the rate upward each year, based on the long-run trend of utility prices rising over time, while Panel Degradation compounds output slightly downward, reflecting that solar panels gradually lose a small amount of efficiency as they age. Both effects run in opposite directions and partially offset each other, which is why the projection needs a year-by-year simulation rather than a single average savings figure.

No — every kWh of production is valued at your full entered electricity rate regardless of whether it offsets your own usage or gets exported to the grid as excess. Many utilities pay a lower rate for exported solar power under their net metering policy, so a system with Bill Coverage well above 100% may show somewhat optimistic savings compared to what your specific utility would actually credit.

The tax credit is subtracted once, upfront, from the system cost to produce Net System Cost — the actual out-of-pocket investment the payback calculation starts from. It doesn't reduce ongoing savings; instead, a larger tax credit simply shrinks the starting deficit the system needs to climb out of, which shortens Payback Period and raises 25-Year Net Profit by roughly the same dollar amount.