Why South Africans need battery backup
South Africa experienced over 6,700 hours of load-shedding in 2023 — an average of 18 hours per day at Stage 6. Even if Eskom stabilises, battery backup protects you from future instability while also maximising your solar investment.
LiFePO4 vs lead-acid: which to choose?
| LiFePO4 (lithium) | Lead-acid (AGM/gel) | |
|---|---|---|
| Cost | R800–R1,200/kWh | R250–R400/kWh |
| Cycle life | 3,000–6,000 cycles | 300–800 cycles |
| Depth of discharge | 80–90% | 30–50% |
| Weight | Light (~10 kg/kWh) | Heavy (~25 kg/kWh) |
| Maintenance | None | Check water levels |
| 10-year cost | Low (1 replacement) | High (3–5 replacements) |
Verdict: LiFePO4 is the clear winner for residential solar. Despite higher upfront cost, the 10-year economics are significantly better.
How much battery capacity do you need?
The rule of thumb: size your battery to cover one load-shedding stage × typical home consumption.
| Stage | Hours per day | Min battery (3kW home) | Min battery (5kW home) |
|---|---|---|---|
| Stage 2 | 2 hours | 5.12 kWh | 5.12 kWh |
| Stage 4 | 4 hours | 5.12 kWh | 10 kWh |
| Stage 6 | 8+ hours | 10 kWh | 15 kWh |
Popular battery options in SA (2026)
- Pylontech US3000C (3.5 kWh) — R12,000–R15,000. The most popular entry-level battery. Stackable up to 8 units.
- Sunsynk 5.12 kWh — R18,000–R22,000. Built-in BMS, good integration with Sunsynk inverters.
- BSL (BYD) 5.12 kWh — R16,000–R20,000. BYD cell quality, competitive price.
- Hubble Lithium 5.5 kWh — R19,000–R24,000. South African brand, excellent local support.
Installation tips
- Ensure your battery is installed in a cool, ventilated space — heat is the enemy of lithium cycle life.
- Always use a battery management system (BMS) — most modern LiFePO4 batteries have this built in.
- Insist on a Certificate of Compliance (CoC) from your installer — required by SA law.
- Check that your inverter is compatible with your battery brand before purchasing.