Ok, well in theory, if only the inverter (and any attached pv) are connected via that rcbo, then the iffy wiring is exonerated,resybaby wrote: ↑Sun Jan 26, 2025 4:12 pm Thanks for the reply Marcus.
Its a Sunsynk ecco hydrid with batteries and ac coupled, so yes all current via the rdbo.
The iffy wiring is just a cheap waterproof external socket kit from Screwfix bolted to the rear of the house and fed via fused spur from the house sockets ring main. The shed/pond/tortoise is simply fed from that external socket via some 2.5mm Twin and earth i had lying around installed through my log store, which then supplies a triple socket in the shed, and onto the pond/tortoise via domestic plugs. Its certainly not installed to part p or anything, im kind of assuming the external socket may be letting water in given the issue only occurs after heavy rain, and everything else is under cover.
as the fault causing the tripping must be on thet rcbo circuit, as that rcbo cannot 'see' faults on other circuits.
I guess the next question is if Sunsynk specify a type of rcd? And if double pole is required you may have to change it anyway (can't remember if the fusebox RCBOs are double pole or not).
I assume the max ac input/output of the Sunsynk is within the current rating of the rcbo.
I stand to be corrected but i'm not sure an old spd would cause problems - just stop doing it's job.Not thinking of removing the main 100a switch, just adding an Rcd in place of the spd (i understand these 'wear out' in a few years and i dont want to leave the wife with that headache in the future).