Free
$0
Try every model as a guest.
- Cash purchase & lease / finance projections
- Summary page with charts
- Draft kept in this browser
- No saved models
Registered
$0
Free account with email sign-in.
- Everything in Free
- 1 saved model
- Open it on any device
Best value
Subscriber
$19.95/month
7-day free trial · cancel anytime
- Everything in Registered
- 10 saved models
- Compare quotes from several installers
- PayPal billing
Questions
What happens if I cancel during the free trial?
Access ends immediately and you won't be charged. You keep your free Registered account and its saved model.
What happens if I cancel after I've been billed?
You keep Subscriber access until the end of the period you paid for. After that your account returns to Registered.
What happens to my saved models if I go back to Registered?
Nothing is deleted. You can still open and delete them, but you can't add new ones until you're under the Registered limit.
How are the projections calculated?
Both models follow a 25-year ROI spreadsheet method: linear panel degradation, inflating electricity prices, SREC income, year-1 incentives, and net present value at your discount rate. See "Assumptions & method" on each model page.