Your roof is an asset. Find out what it earns.
Rates rise, the grid gets less reliable, and solar quotes are written to be hard to compare. This tells you what a system on your roof would actually return, in about a minute, free. No sales pitch and no calls. If the numbers don't work at your address, we say so.
Built on Google Solar imagery and PVWatts® modeling, the same data installers use. Works for most US urban and suburban addresses. Nothing is saved without your consent.
A calculator that models your actual roof
Most free tools scale a national average by your bill. This one models your building in 3-D, places panels on real roof planes, and simulates production hour by hour. Then it compares cash, loan, lease and PPA over 25 years.
It also shows what the leasing company makes on your roof. We have not found another free tool that does.
An unbiased read on the quote you were given
Paste a quote. It pulls out the price, size, financing and the escalator buried on page eleven, then checks them against an independent model of the same roof. Built by a former renewable energy research scientist.
We are not selling you the system, so we have no reason to flatter the quote.
Get paid up to $500 by SIA for going solar
coming soon
A cleaner way to actually go solar. The usual route sells your number to five companies. Instead: one installer, vetted by us, and only if you ask.
They pay us a finder's fee because a customer who already understands their numbers costs them far less to find. We share part of it with you in cash after your system is installed.
Not a prize draw. A cut of a fee we only earn if the introduction was worth making. How it works, and the vetting ↗