Leakage current on installations with solar

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
Parents
  • 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 think that I am about as confused as you are.

    If nothing is switched on, where is the current flowing?

    One possibility is FCUs (with the appliances' functional switches open), but surely not on every circuit.

    If the leakage occurs when the solar is isolated (with a 2-pole switch), I cannot see how it can be relevant, so perhaps forget that it is there for the moment.

  • isolated (with a 2-pole switch)

    Is it necessary to disconnect the neutral in a TN system?

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