Solar Savings Calculator

What could solar actually save you?

Answer three quick questions about your home and we'll estimate a sensible system size, cost range, and payback period — based on your province's sun hours and current tariff trends, not guesswork.

Average monthly electricity bill R 2,800
Drag to match your typical bill. We'll back-calculate your usage from your province's tariff.
Province
Used to estimate average daily sun hours for your area.
What's the priority?
Backup duration during an outage 4 hrs
How long you'd like essential circuits powered when the grid goes down. Sized using your average hourly usage across the day — if your evenings draw noticeably more than your daily average (cooking, heating), size up a little for safety margin.
Is anyone usually home during the day?
Solar only saves you money on power you actually use as it's generated. Without a battery, power nobody's using during the day is mostly exported for little or no credit — this affects your real savings more than most quotes let on.
Recommended system
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Est. monthly savings
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Simple payback
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Estimated system cost
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25-year est. savings
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Panels needed (approx.)
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25-year cost: staying on the grid vs going solar
Grid cost assumes historical average annual tariff increases continue. Solar cost is your upfront capital, spread flat.
Staying on the grid
Going solar
Assumptions used in this estimate
Electricity tariffR 3.00 /kWh
Annual tariff increase9%
Target grid offset80%
Installed cost per kWpR 16,000
Battery cost per kWhR 8,500
These defaults reflect typical South African market ranges as of 2026. Adjust them if you have a specific quote or tariff to test against.

This calculator gives an indicative planning estimate only — not a formal quote. Savings are adjusted for how much of your generated power you're likely to actually use as it's produced (self-consumption) rather than assuming every generated unit is saved at full value. Actual system size, cost, and savings depend on your roof, shading, real consumption pattern, and the specific installer and components used. There is currently no personal solar tax rebate in South Africa (the R15,000 rebate expired February 2024); some municipalities offer net metering or feed-in credit for exported power via SSEG registration, which isn't included in this estimate.

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