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Hi all, just registered today and sorry to come straight in with a request for help.

I wasn't sure if this would be best in the commercial forum or the domestic one as really it is using comercial type equipment on a domestic ring main.

I have 2 large battery charger/inverters in use at my house which I can individually use with no issues but if i power both up together then at some point over the next 24 hours my RCD will trip. The chargers are a Victron Multiplus 12/2000/80 and a Mastervolt Mass Combi 12/4000/200. The inverters are not feeding in to the domestic supply so it is only the chargers that are effecting the RCD. I believe the problem will be due to the large capacitors built into these chargers causeing earth leakage which is beyond the normal level for a domestic (wylex type AC) RCD. I am just wondering if anyone has come up against a similar issue? Would the solution be to supply these inverters from a RCBO to remove the influence of all other electronics in the house or maybe run each charger from its own RCBO?
 
It's a common problem, but not normally a domestic one.

Sharing the leakage between the 2 RCBOs is most probably the way to go without seeing the installation.

You could design a circuit to omit the RCD but probably pointless in your case.

One of the domestic chaps may offer a better solution.


EDIT: Also check its dropping out on earth leakage not overload. I haven't googled the charger specs.
 
It definitely not overlaod. Max draw for both cargers together on full load is just over 20amps. They tend to trip the RCD after a few hours once the batteries are charge though so current draw will be minimal by that point. Its an 80a RCD and 32a MCB
 
Measuring the leakage would be the best place to start, then a test on the RCD itself.

It may be letting go before its threshold.

Split the chargers across 2 circuits if you have a 2 way split RCD board.

RCD will be 30mA.
 

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