South Africa Solar Savings Calculator
Enter your monthly electricity bill and city to get an instant estimate of your solar savings — based on real PVGIS satellite data and your local tariff rate.
Your details
Include battery backup
Stage 6-proof, higher savings
Using Johannesburg tariff: R3.08/kWh · 1,820 kWh/kWp solar yield
5.5 kW
Recommended system
12 × 460W panels
R1 200
Monthly saving
grid-tied only
5.9 yrs
Payback period
grid-tied (no battery)
R1 973k
25-year saving
12% annual tariff increase
Full breakdown
* Calculations based on PVGIS v5.2 irradiance data and Johannesburg tariff. Actual results may vary ±15% based on shading, roof angle, and system quality.
How we calculate this ▸
Irradiance data: PVGIS v5.2 from the EU Joint Research Centre. Annual kWh/kWp for your city at 25° tilt, north-facing. 10-year satellite average.
Tariff: 2024/25 effective tariff for Johannesburg (R3.08/kWh inclusive of all levies and VAT).
System sizing: Target 80% bill offset. System loss factor 0.80 (inverter + cable + soiling). Panels: 460W monocrystalline.
Self-consumption: Grid-tied = 60% self-consumed, 40% exported (typical SA profile). Battery = 85%.
Tariff escalation: 12% per year (Eskom MYPD average 2018–2025).
Calculator FAQs
Get a full personalised quote — free
The calculator gives you an estimate. A full quote gives you an exact system, real installer prices, and a PDF you can use to compare.
Get My Free Quote →