INPE 2017 · ANEEL Jan/2025 · Greener 2025
Free, transparent simulation with INPE's solar atlas (2017), ANEEL tariffs and Greener costs (2025) — and Lei 14.300 (Brazil's distributed-generation law, the so-called “sun tax”) already in the math. No signup, no phone number, no sales pressure.
Simulate my savings →Takes less than 1 minute
Home with 400 kWh/month on CPFL Paulista — irradiance 4.7 kWh/m²·day (INPE/LABREN, 2017).
System
3.4 kWp
Investment
R$ 9.747
Savings/month
R$ 283
Payback
2 years 10 months
Average amount and consumption — straight from a recent bill.
We match it to INPE's solar atlas (2017): 5.569 municipalities covered.
System size, investment, payback and 25-year savings — with Lei 14.300 calculated year by year.
SimSolar calculates feasibility from your electricity use, bill amount, municipality, utility and connection type. The result shows system size, estimated investment, monthly savings, payback and net savings over 25 years.
SimSolar uses irradiance from the INPE/LABREN Brazilian Solar Energy Atlas (2017), covering 5,569 municipalities. Utility tariffs come from ANEEL, and residential solar-system costs use Greener's 2025 references.
Yes, the simulation applies the Fio B grid charge established by Lei 14.300 year by year. The model uses 60% in 2026 and the progression to 90% in 2028, which changes the estimated savings and payback.
No, the solar simulation does not require an account, phone number or sales form to show the result. The calculation is free and available immediately.