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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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  • 0

    I've checked my own house and another, and it seems within expected range, about 3.5mA
    Yes very high leakage and I can't understand where it is coming from, hence why I wonder about he 
    solar. 
    DId some basic tests I haven't disconnected anything,  took a Zdb and that was fine 0.12Ω
    Contact voltage tests fine
    IR Line-CPC fine
     

  • 0 in reply to JohnE

    T-N-C-S presumably. Fault downstream on a neighbours property causing neutral current diversion through your property? That's a total guess.

    Totally isolate the PV, even the CPCs, to see if it is that causing the fault. Presumably there is an isolator on the DC side to turn that off?

    Narrow down where it is coming from, as you say, anything with a CPC or a class one accessory could be the cause with a N-E fault.

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  • 0 in reply to JohnE

    T-N-C-S presumably. Fault downstream on a neighbours property causing neutral current diversion through your property? That's a total guess.

    Totally isolate the PV, even the CPCs, to see if it is that causing the fault. Presumably there is an isolator on the DC side to turn that off?

    Narrow down where it is coming from, as you say, anything with a CPC or a class one accessory could be the cause with a N-E fault.

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