Choosing equipment
There is no single "most reliable" brand — it depends on what you need.
Victron and Fronius have the best long-term reputation and near-zero complaint volume on SA forums — but they cost 40–60% more than mid-tier brands.
SunSynk and Deye are the most popular hybrid inverters in SA. They work well for most homes. However: PowerForum owners have documented warranty repair waits of 58+ days, R6 900 labour charges, and warranty voiding if repaired by a non-authorised technician.
Growatt and Axpert work fine for basic backup but have noticeably slower grid-to-battery switchover and limited parallel capability. Fine for load shedding — not ideal if you want full hybrid blending.
Bottom line: SunSynk or Deye is the sweet spot for most SA homes. Budget R14 000 – R24 000 for the inverter alone.
They share a common hardware platform (both manufactured by Deye) but differ in software and support:
SunSynk has stronger local SA support with a dedicated service centre, but repair wait times can be long. Their firmware is tuned for SA conditions.
Deye is generally R1 000 – R3 000 cheaper for equivalent models. Support is through importers and distributors rather than a single brand representative.
Both are NRS 097-2-1 approved. Both work with all major LiFePO₄ battery brands. The choice mostly comes down to installer preference and after-sales support in your area.
It depends on your bill, not your roof. A rough guide for Gauteng (4.9 peak sun hours):
R600–R1 800/month bill: 4–6 × 550W panels (3.6 kW inverter)
R1 800–R4 000/month: 8–10 × 550W panels (5 kW inverter)
R4 000–R7 500/month: 12–14 × 550W panels (8 kW inverter)
Use our solar sizing calculator for a personalised estimate.
Batteries and load shedding
For basic essentials during Stage 4–6 (lights, WiFi, TV, laptop, fridge): a 5.1 kWh battery is the minimum that makes sense. This gives you roughly 4–6 hours depending on what's running.
For comfort during extended outages (add microwave, kettle, security cameras): 10.2 kWh (two 5.1 kWh units in parallel).
One battery is not enough for geysers, stoves, or pool pumps. Those need either a much larger system or a gas alternative.
The most common SA setup we see is a 5 kW inverter + 5.1 kWh battery — it handles Stage 6 comfortably for a typical household's evening routine.
Yes — read the fine print. This is one of the most contentious topics on SA solar forums.
Hubble AM-2: Multiple PowerForum users (April–May 2026) have reported battery housing bulging on older v1.5 BMS units. Hubble's BMS requests 53.8V from the inverter, but support sometimes denies warranty claims at anything above 53.6V. Ask your installer to confirm the exact charge voltage they programmed.
Pylontech: Similar warranty disputes with swollen batteries. The BMS allows cell voltages up to 3.9V, which some argue is too high for LiFePO₄ longevity.
Protection: Get the installer to put the battery charge voltage settings in writing on the quote. If the battery fails and those settings match the manufacturer's spec, you have a paper trail.
This is a common SoC (State of Charge) calibration issue. The inverter relies on voltage to estimate charge, and voltage drops under load can trigger a premature "empty" reading. Solutions:
1. Do a full discharge/recharge cycle to recalibrate the BMS. Most installers recommend doing this every 3 months.
2. Check the battery communication cable — if your inverter and battery aren't talking via CAN/RS485, the inverter is guessing.
3. Set the shutdown voltage correctly — 48V is typical for a 15-cell LiFePO₄ battery. Setting it too high wastes capacity.
Installation and compliance
You should receive three documents minimum after installation:
1. Certificate of Compliance (CoC) — issued by a DoEL-registered installation electrician. Legally required under SANS 10142-1.
2. SSEG registration confirmation — proof that your system is registered with your municipality (City Power, Eskom, or City of Cape Town). Grid-tied systems under 100 kVA no longer need an ECSA engineer sign-off (2026 rules) — a DoEL electrician's CoC is sufficient.
3. NRS 097-2-1 certificate — proof your inverter model is type-tested and approved for grid connection. Your installer should provide a copy.
⚠ Red flag: Any installer who says "the CoC will come later" or "SSEG registration isn't necessary." It is necessary, and it's the law.
Equipment substitution (promising SunSynk but installing Growatt, or swapping 550W panels for 455W) is unfortunately common in SA. Protection:
1. Get model numbers on the quote, not just brand names. "Deye inverter" is too vague — insist on the exact model.
2. Photograph the equipment boxes before installation. Check model numbers match the quote.
3. Do not pay the full amount upfront. Standard practice is 50% deposit, 50% on completion after CoC is issued.
A standard 5 kW system (inverter + battery + 8 panels) takes 1–2 days for a professional crew of 2–3 people. Larger systems (8 kW+, hybrid with more panels) may take 2–3 days.
Add 1–2 weeks for SSEG registration processing, depending on your municipality. City Power Johannesburg typically processes within 5–10 working days.
Yes. PV GreenCard is the SA solar industry's quality assurance programme — backed by SAPVIA. An installer with PV GreenCard certification means:
- They've passed a theoretical and practical assessment
- They follow SANS 10142-1 wiring regulations
- They issue proper CoCs
- They're accountable to SAPVIA's code of conduct
It is not a guarantee of perfection — but it eliminates the bottom tier of installers who have no formal training at all. Every installer we match you with is PV GreenCard certified and SAPVIA registered.
Cost and savings
Yes — the higher tariffs go, the faster solar pays for itself.
The 2026 tariff increases (8.76% Eskom in April, 9.01% municipal in July) mean every kilowatt-hour you generate yourself is worth more than it was last year. At Johannesburg's City Power high-tier rate of R3.48/kWh (before the July increase), a typical 5 kW system saves R2 600 – R3 200 per month.
At 10% annual escalation, a R130 000 system pays back in under 5 years and saves over R400 000 across 10 years. See our full cost breakdown with the case study.
Yes. Several SA options exist:
- Bond registration: Many banks (FNB, Standard Bank, Nedbank) allow you to add solar to your home loan at bond interest rates — the cheapest option
- Solar loans: FNB offers dedicated solar finance; MFC (Nedbank) covers solar via vehicle finance
- Rent-to-own: Companies like Wetility and GoSolr offer subscription models where you pay monthly — you don't own the equipment, but there's no upfront cost
We don't offer finance ourselves, but we can connect you with installers who do.
Still have questions?
Get matched with installers who can answer them — based on your actual home, not a brochure.