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diy solar

Barn Earthing for Solar, 80 Meters from Cut Out

Anapeiratic

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Joined
Aug 30, 2023
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1
Location
United States
I’m installing 20KW of Solar on my Barn roof,

The barn is fed from a 3 phase supply originating at the house which is 80 meters away.

I’ll be installing some 35mm 4 core to minimise the losses to <1% volt drop between the barn and the point of supply located at the house.

The Earthing at the Cut Out at the house is TNC-S fed from a PME.

In The Barn is a consumer unit, 3 phase stuff, Lathe, Welding, car lift and some single phase consumers.



Located at the house is another 3 Phase Board, with single phases feeding the House, the Annex (A small bungalow) and some Lighting for stables and outdoor sockets

I’m using 2x Single phase invertors due to the loads being unbalanced and there being only two main consumers, House and Annex.

My question is what earthing arrangement should I use at the Barn, it’s 80 Meters from the point of supply, is a consumer, but when the Solar Panels are working it’s a generator?
 
Last edited:
I’m installing 20KW of Solar on my Barn roof,

The barn is fed from a 3 phase supply originating at the house which is 80 meters away.

I’ll be installing some 35mm 4 core to minimise the losses to <1% volt drop between the barn and the point of supply located at the house.

The Earthing at the Cut Out at the house is TNC-S fed from a PME.

In The Barn is a consumer unit, 3 phase stuff, Lathe, Welding, car lift and some single phase consumers.



Located at the house is another 3 Phase Board, with single phases feeding the House, the Annex (A small bungalow) and some Lighting for stables and outdoor sockets

I’m using 2x Single phase invertors due to the loads being unbalanced and there being only two main consumers, House and Annex.

My question is what earthing arrangement should I use at the Barn, it’s 80 Meters from the point of supply, is a consumer, but when the Solar Panels are working it’s a generator?
Do you have the invertes set up to feed two of the 3 phases at the house? Why not put them at the barn and feed the power to the house via the AC?
 

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