Hardware
Why does my hybrid inverter trip on overload during load shedding in South Africa?
Island-mode overload trips usually mean the essential board peak (geyser, stove, pump, EV) exceeds the inverter continuous or surge rating once the grid is gone — fix the board split or the habit, not by bridging protection.
Updated 27 October 2026 · Illustrative ranges — not a formal quote, credit decision or legal advice.
Answer first: List every essential circuit and its running watts. If the sum (plus motor surge) beats the inverter island rating, move loads or sequence them — essentials · geyser on backup · aircon on battery · whole-house vs essentials.
Common trip patterns
| Pattern | Likely cause |
|---|---|
| Trip when geyser element closes | 3 kW continuous on a tight inverter |
| Trip when borehole starts | Surge > peak rating |
| Trip at stove + kettle | Simultaneous kitchen peaks |
| Trip only after firmware | Stricter limits — read release notes |
Fixes that stay legal
- Move geyser/oven to non-essential or smart-schedule them off during Stage.
- Add soft-starters or VFDs on large pumps where the electrician specifies.
- Upsize inverter only after a measured load log — not guesswork.
smart geyser · DB upgrade · red flags.
Safety
Do not defeat overload or earth-leakage devices. A CoC assumes protection works — earth leakage · CoC · DIY risks.
Bill maths before hardware
Pull three months of kWh and rand from your bill or prepaid tokens. Compare that to the quote’s self-use assumption at your metro’s published rates — monthly savings · fixed charges · export vs self-use · export credit vs self-use rand · metro tariffs · costs & savings · check a quote.
Overload trips: surge loads vs undersized hybrid
Kettles, angle grinders and borehole pumps create short surges that trip hybrids sized only on average kW. Check the OEM’s 10-second / 3-second surge rating against your essential board. Splitting non-essential loads beats buying a second inverter on day one. Log the portal’s peak load when trips happen.
- Stagger geyser and EV when on backup.
- Soft-starters help some pumps — ask the electrician.
- Repeated trips after a firmware update may need OEM support — essential loads · stove on backup · inverter size.