Estimate the payback period of a home solar installation.
Year-one savings are the monthly bill times the offset, repeated with a small annual escalation for rising utility rates. Payback is the cost divided by that savings. Solar pays itself off through avoided utility bills and then produces free power, so the payback horizon tells you how quickly the investment turns profitable.
Solar Panel Payback
Payback = cost / (monthly bill x offset%); 10-yr net = summed savings - cost
Payback = cost / (monthly bill x offset%); 10-yr net = summed savings - cost Year-one savings are the monthly bill times the offset, repeated with a small annual escalation for rising utility rates. Payback is the cost divided by that savings.
Solar pays itself off through avoided utility bills and then produces free power, so the payback horizon tells you how quickly the investment turns profitable.
This calculator takes 4 inputs: System cost (after credits), Current monthly bill, % bill offset, Annual savings increase. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.