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Solar Energy & Panel Sizing Calculator

Calculate how many solar panels you need to cut your electric bill. Estimate system kWp size, required roof area, yearly savings, and investment payback.

Dados da sua conta e localidade

R$
R$

Brazil national average: R$ 0.95.

Photovoltaic Solar System Sizing

R$ 5.430,00 / ano

Economia de aproximadamente R$ 452,50 por mês na conta de luz.

Estimated payback period

3.2 years

Retorno do investimento

Recommended system capacity

4.40 kWp

Estimated solar panels

8 placas

550W modules

Required roof area

21 m²

Estimated monthly generation

494 kWh

Estimated investment (turnkey system + installation):R$ 17.600,00

Estimated simulation for grid-tied solar systems. Real numbers depend on roof orientation, shading, and local utility regulations.

How it works

1

Enter your average monthly electric bill and region in Brazil.

2

Select electrical service phase (single, split, or three-phase).

3

View recommended panel count, estimated system cost, and payback duration.

Frequently asked questions

Is it really free?

Yes. The site is supported by ads, so you never pay or need to create an account.

What is the typical solar payback period?

In Brazil, typical residential solar installations pay for themselves in 3 to 5 years, with panel warranties lasting 25 years.

Does it work on mobile?

Yes. The page adapts to your screen and does not require installing any app.