Solar Savings Calculator
Payback period and lifetime saving from a rooftop system after incentives.
How this number is built
Doing it by hand
Step 1
Size the system against your actual annual consumption, not roof area.
Step 2
Get installed cost per watt from at least three quotes.
Step 3
Use local peak sun hours rather than a national average.
Step 4
Apply the incentive you actually qualify for and check whether it is refundable.
Step 5
Model self-consumption honestly — a daytime-empty house exports far more than it uses.
What people ask next
Do batteries change the payback?
They raise self-consumption but add substantial cost. Model them as a separate decision after the panels pay back.
What happens after the panels degrade?
Most panels still produce around 85% of rated output at year 25, so generation continues well past payback.
Searches this page answers
| Related search | Goes to |
|---|---|
| how to calculate solar savings | How to Calculate Solar Savings |
| solar payback | How to Calculate Solar Savings |
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