PV power back from Garden Room to feed immersion heater

[Murdochcat]

Your original idea with the 4 core cable should work. Personally I would use 5-core so the circuit back to the immersion in the house has its own neutral. You will need to take the immersion circuit out of the CU in the house and connect it to the 5 core with an MCB in a separate enclosure suitably labelled or a fused spur box.

You may need a separate earth rod for the Garden Room so it is TT earthed, rather than exporting the earth from the house presuming that is T-N-CS.

Sharing neutrals in this situation could very easily lead to tripping RCBOs or RCDs

 

[EFLImpudence]

RCBOs are RCDs.

 

[muh3]

Sorry all, I didn't get any notification on answers.

I think you are missing out on the understanding of how these divertors work ........

I think I do understand

or use a 5 core

The cable to the shed is 25mm the cable to the immersion only needs to be 4mm, so it was cheaper buying 2 x 3 core instead of the 5 core.

Are you having a grid connected inverter? Most diverters won't off-grid work as they detect the excess being sent back to the grid.

Yes grid connected

Your original idea with the 4 core cable should work. Personally I would use 5-core so the circuit back to the immersion in the house has its own neutral. You will need to take the immersion circuit out of the CU in the house and connect it to the 5 core with an MCB in a separate enclosure suitably labelled or a fused spur box.

You may need a separate earth rod for the Garden Room so it is TT earthed, rather than exporting the earth from the house presuming that is T-N-CS.

No problem, will do, I assume the electrician knows about the earthing, I have an earth rod near the house and 2 cables coming in from the mast, that is all I know

Sharing neutrals in this situation could very easily lead to tripping RCBOs or RCDs

This is sorted now with a separate cable coming from the divider to the immersion.



Thank you all.