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

borehole · stove · firmware.

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.

Desk close

Keep metro and OEM PDFs beside this page. When rand bands disagree with a live primary, the primary wins. Revisit after any Stage-calendar or tariff change — metro tariffs · tariffs 2026 · choose installer · get quotes · check a quote.

Sources homeowners can open

Your metro SSEG / tariff PDF (live municipal site).
OEM inverter and battery warranty PDFs for the quoted SKUs.
NERSA and municipal tariff schedules for the current year.
NRS 097 dual-supply labelling notes via your registered electrician.

Commissioning evidence pack

Before sign-off, collect serial photos, firmware version, export-limit screenshot, CT polarity photo, dual-supply label photos, CoC number, and the guest monitoring login. Store them with the invoice PDF — CoC · export limit · CT clamps · labels · firmware · warranty claims.

Tariff and fixed-charge reminder

Self-use savings sit on top of fixed charges that do not disappear when panels go up. Model both before celebrating a payback slide — fixed charges · monthly savings · export vs self-use · bill still high · costs & savings.

Safety do-not list

Do not DIY dual-supply boards or MC4 strings.
Do not bridge RCDs to stop trips.
Do not ignore isolation or earth-fault alarms.
Do not disable export limits to “get more power.”

DIY risks · earth leakage · MC4 · DC isolation · red flags.

Stage-weekend reality check

Model the worst Stage window you actually live through. Essentials first, then comfort loads. If the plant cannot cover fridge, lights, fibre and one work laptop through that window, resize before you chase export credits — essentials · Stage strategy · Stage 4 battery · SoC settings · load shedding hub.

Extra SA context

Keep this page next to your metro tariff PDF and the OEM warranty letter for the SKUs on your quote. When numbers disagree, the live primary wins. After any Stage-calendar change, revisit SoC floors and the essential board list — SoC · Stage strategy · Stage 4 · essentials · monitoring · choose installer · get quotes · check a quote · FAQ · about.

Extra SA context

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.

Homeowner close-out for inverter overload trips sa

Keep OEM and metro PDFs beside this answer. Confirm Incl. VAT line items, NRS-listed SKUs where relevant, and who owns paperwork after deposit. Compare two written scopes before you pay — read a quote · choose installer · check a quote · get quotes · costs & savings · metro tariffs.

Quick questions

Why overload only on Stage?

On-grid the metro shares peaks; islanded, the inverter is the only source.

Is a bigger inverter the fix?

Sometimes — often re-homing non-essentials or sequencing loads is cheaper.

Can I bypass the trip?

No. Bridging protection is a fire and CoC risk.

Surge vs continuous?

Motors need surge headroom; geysers need continuous kW.