Start from your average monthly grid and generator costs—not a generic national tariff.
How this calculator works
The calculator estimates the portion of grid and generator spending a solar-and-battery system may replace, adds an optional smart-control efficiency scenario, subtracts an annual maintenance allowance and compares the result with the proposed project cost.
Set a realistic share of energy the proposed system will cover and keep maintenance visible.
Review monthly, first-year and five-year outcomes, then compare the assumptions across installer quotes.
Worked example
A practical planning scenario
A household spending ₦50,000 on grid electricity and ₦100,000 on generator fuel each month can test whether a ₦5,000,000 system with 80% energy coverage produces an acceptable payback. Changing coverage or system cost immediately shows how sensitive the result is.
Frequently asked questions
Is the savings estimate guaranteed?+
No. It is an editable planning scenario. Production, tariffs, fuel prices, system uptime, battery life and actual usage affect the result.
Why enter generator spending separately?+
In many markets, especially Nigeria, avoided fuel and servicing can be as important as the grid-bill reduction.
Does electricity band set my tariff?+
No. Tariffs vary by utility, customer class and current regulatory orders. Use your actual bill or prepaid purchases for the most useful estimate.