How much solar and battery do you actually need?
Stop guessing from installer quotes. Enter your usage and SunService gives you an honest, indicative system size — solar kWp, battery kWh and inverter kVA — so you know what's reasonable before you buy.
Indicative estimate only — not engineering or financial advice. Figures use conservative South African averages and your inputs; your real system depends on a site assessment. Guidance last reviewed 2026-06-24.
SunService is free. If you ask for quotes, we share your details with NanoLeap and vetted installers — see our privacy notice.
What size solar system do I need in South Africa?
As a rough rule in South African sun, each 1 kWp of panels generates about 4–4.5 kWh per day averaged over the year. So a home using ~30 kWh a day that wants to cover most daytime use needs in the region of 5–8 kWp of panels, a 5–10 kWh battery for evenings or backup, and a 5–8 kVA inverter. Backup-only systems lean on a bigger battery and less solar; off-grid needs more of both. Your real numbers depend on your roof, your loads and a proper site assessment.
Size yours above, or read the full solar & backup power guide.
Honest, not a sales pitch
We estimate from your own usage with conservative, stated assumptions — no inflated systems, no invented prices or brands.
Know the rules
Grid-tied systems need SSEG registration; every install needs a CoC. The guide explains it plainly.
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