Solar payback chart
Paste the quote, your annual usage and your tariff, and read the years to payback with the assumptions printed beside it.
1 · Paste the quote, your usage and your tariff
FIRST-LOAD
Data note: Everything runs in this browser tab on the payback chart: your quote and bill figures stays on this device, nothing is uploaded, and the reading is rebuilt only when you press run.
Perspective: Before: the reader relied on the quote's payback claim. After: they can see payback at year eleven on their own consumption figures.
2 · Read the payback chart
Paid layer: the quote file
one-time step · the free reading above stays complete
Free tier
- one complete payback chart
- years to payback on your own figures
- state link for a partner
What $9 one-time adds
- three quotes kept on this device
- printable comparison with assumptions listed
- CSV of year, saving, tariff and cumulative position
One quote avoided on a $9,400 system is 1,044× the price; the comparable it undercuts is a solar broker's commission of $500 or more baked into the quote.
Local history (this device)
- No saved runs yet — your first run files here.
Your purchase is handled through secure checkout. When you return, your extras are ready on this device — no account, no fuss, and your work stays private in this browser.
Boundary and sources
This payback chart works only on the quote, usage and tariff figures you paste you paste. It does not recommend an installer, does not model financing or tax, and does not guarantee a saving. The figures describe what you supplied, not what is true in the world. Confirm anything you plan to act on with your energy supplier and, for a decision this size, an independent adviser without installer commission before you rely on it.
- Every figure comes from the quote, usage and tariff figures you paste you paste; nothing is looked up, scraped or asserted as verified.
- Method: cumulative position = (annual saving × years) − net cost; the payback year is where the cumulative position crosses zero
- Sample values are labelled samples — illustrative by design, not your data and not a quotation of any organisation's policy.
Mechanism: competence-autonomy-loop