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Powerwall 3 tripping RCDs in powercut

 
Energy Storage
Last Post by Tim441 1 hour ago
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 Tim441
(@tim441)
Honorable Member Contributor
Joined: 4 years ago
Posts: 437
Topic starter 09/07/2026 4:27 pm   [#3092]

My son has a house that was fully rewired in 2015 with a CU that included 2 RCDs & MCBs

A recent install of Powerwall (with Gateway) with PV Solar was apparently successful but unfortunately not tested for grid outage.

Subsequently power cuts and tests tripped one of the RCDs every time. It would not reset without a full powerdown of Powerwall. Obviously giving less resilience than before.

Investigations by installer said initially there was a earthing fault but now says that the RCD is the problem. They say replacing the RCD might cure the problem - but no certainty longer term.

They recommend a complete replacement of CU (with RCBOs etc).

Somewhat disappointing that the issue was not found earlier - at least with an initial test. However the main thing is to resolve the issue.

Do installers/electricians agree with the diagnosis and proposed solution?

I have asked the installer for a written report so that I can pass to electrician - but not received yet.


Listed Grade 2 building with large modern extension.
LG Therma V 16kw ASHP
Underfloor heating + Rads
8.7kw pv solar
3 x 8.2kw GivEnergy batteries
1 x GivEnergy Gen1 hybrid 5.0kw inverter
Manual changeover EPS
MG4 EV


   
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