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Leakage current on installations with solar

JohnE

I have been looking at a domestic installation that has solar and batteries

The solar and battery (Solar edge and Fox ESS ) are on their own sub board via henleys
The main house circuits on a split load board.
 
The leakage current is very high on the tails of the main board, round 350mA up to 700mA
With everything isolated, no leakage.

With solar all off and isolated, and the main switch of the house CU on, but no circuits energised,
I get a bump in leakage of about 15mA
When I switch on individual MCBs, I get a leap of about 100mA on some circuits and 40mA on others
with all house circuits on, but no real current draw,(nothing switch on)
I'm up past 700/ 800mA and it fluctuates up and down rapidly.
 
I thought about disconnecting the isolated solar boards main earth, but as I know little about solar
I do not want to start disconnecting anything really.
 
With isolated solar, can you still get leakage from it, which can find its way onto
the rest of the installation, and as circuits are closed, the leakage increases.
More parallel paths?

Any advice would be appreciated. Thanks
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    The leakage current is very high on the tails of the main board,

    The main board then, not the solar/battery one? I take it you're clamping the L&N tails but leaving the earth out of it, Sounds more like a conventional fault. If it increased with load I'd suspect a N-PE fault somewhere (although it could still be that, if loads in neighbouring properties happened to be pulling the supply N up or down). The symptoms you mention sound more like rodent damage to cables to me though or damp ingress. Was you IR test done with the c.p.c.s still connected to Earth? Other possibilities might be a shared N between the sub-db and the main one - hopefully unlikely for a recent install, but maybe if there are controls/sensors involved.

      - Andy.

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  • 0

    The leakage current is very high on the tails of the main board,

    The main board then, not the solar/battery one? I take it you're clamping the L&N tails but leaving the earth out of it, Sounds more like a conventional fault. If it increased with load I'd suspect a N-PE fault somewhere (although it could still be that, if loads in neighbouring properties happened to be pulling the supply N up or down). The symptoms you mention sound more like rodent damage to cables to me though or damp ingress. Was you IR test done with the c.p.c.s still connected to Earth? Other possibilities might be a shared N between the sub-db and the main one - hopefully unlikely for a recent install, but maybe if there are controls/sensors involved.

      - Andy.

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