Most popular sizes · SA market 202615 kW Solar System solar system
15 kW Solar System solar system
South Africa guide
Large commercial and estate-scale solar, designed for complete grid independence or significant commercial load reduction.
Suitable for: Commercial or large estateMonthly bill: R8,000+
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15 kW Solar System system at a glance
- System cost (installed)
- R230,000 – R350,000
- Monthly electricity saving
- R5,000 – R10,000
- Payback period
- 3–4.5 years
- Annual energy output
- 21,600 kWh/year
- Typical panel count
- 34–42 × 400W panels panels
- Inverter example
- Victron 3-phase or Sunsynk 3-phase 15 kW
Based on national avg tariff R2.90/kWh, 1,900 kWh/kWp/yr, 80% yield factor. Methodology
Battery backup options for a 15 kW Solar System system
Add a battery to keep power during load-shedding and increase self-consumption from 60% to 85%.
Commercial storage
30.7 kWh
Additional cost
+R185,000
Full off-grid capability
51.2 kWh
Additional cost
+R300,000