5 kW solar payback in Boksburg: 3.6–5.1 years
At Boksburg's 2026 tariff of R3.15/kWh and PVGIS yield of 1 820 kWh/kWp/year, a 5 kW grid-tied solar system pays for itself in 3.6 years (with battery, 85% self-consumption) to 5.1 years (no battery, 60% self-consumption). Below is the full calculation, with every input shown.
How we get to 3.6–5.1 years
0.80 loss factor accounts for inverter inefficiency, wiring losses, dust, and temperature derating. Self-consumption assumptions follow Victron / SolarEdge published South African data. See full methodology.
What if you add a battery?
Adding a battery to the 5 kW system bumps total cost to about R132 500 but raises self-consumption to ~85%. In Boksburg that pushes payback to roughly 5.4 years. The battery also covers load-shedding stages 4–6 and protects against tariff escalation faster than a grid-tied setup, which is why most Gauteng homeowners now opt for hybrid systems.
5 kW payback in other SA cities (fastest first)
| City | 5 kW payback | Compare |
|---|---|---|
| Saldanha Bay | 3.4 yrs | City page → |
| George | 3.5 yrs | City page → |
| Cape Town | 3.6 yrs | See full maths → |
| Benoni | 3.6 yrs | City page → |
| Stellenbosch | 3.6 yrs | See full maths → |
| Upington | 3.6 yrs | City page → |
FAQ — 5 kW payback in Boksburg
What is the payback period for a 5 kW solar system in Boksburg?
Between 3.6 and 5.1 years, depending on whether you add a battery (which raises self-consumption from 60% to 85%). After payback, every kilowatt-hour the system produces is pure savings for the remaining 15–20 years of panel life.
What does the calculation assume?
Mid-market 2026 system cost (R87 500 for 5 kW grid-tied), Boksburg's PVGIS v5.2 irradiance (1 820 kWh/kWp/year), the local municipal tariff (R3.15/kWh), an 80% loss factor (inverter, soiling, derating), and 60–85% self-consumption. We use nominal payback — including 10%/year tariff escalation would shorten actual payback by 0.5–1.5 years.
Does adding a battery slow payback?
Slightly yes. A 5 kW + battery configuration in Boksburg pays back in about 5.4 years vs. 3.6 years without. The trade-off: the battery moves you from ~60% self-consumption to ~85%, eliminates load-shedding pain, and protects you from rising tariffs faster.
What about the SARS Section 12B rebate?
Section 12B lets you claim 125% of the PV panel cost as a depreciation deduction. For a homeowner in the 36% income-tax bracket, that's roughly R15 750 of deferred tax benefit on this 5 kW system — which can shave another 0.8–1.2 years off your effective payback.
What happens after payback?
After year 5.1, the system continues generating roughly 9 100 kWh/year for another 15+ years. At today's tariff that's R24 360/year of free electricity per year, growing as Eskom raises tariffs. Over a 25-year lifecycle, the same system in Boksburg typically nets R521 500+ in lifetime savings.