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EICR Coding of PV & EESS Poor Practice

Chriso

Evening all,

First time I've posted in a long time, first time on this new set up.

Did an EICR today that took in a small outbuilding with an old FIT PV system installed.  Since this installation another company has added a second inverter and a battery.

The outbuilding is supplied with a 2.5 SWA to a garage style distribution board with a 40A 30mA RCD main switch (AC type), personally think the sub main to this building should have been upgraded prior to the initial solar being installed.

The new inverter and battery is fed directly from the original system rotary isolator (via another isolator).  This is all supplied via a B16 MCB.  The PV inverter is rated at 4kW and the battery inverter is 3kW.

My thoughts are that obviously each inverter should be on it's own circuit, there is also the issue of the new inverter and battery now being connected to the FIT export meter.  But for me the big one is if the battery is full and the PV is in optimum conditions you could have a overload situation. There is the B16 MCB to potentially limit this and there apparently haven't been any incidences of nuisance tripping.

C2 or C3, what does everyone think?

Chriso 

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    How is the battery charged? If it can only be charged from the PV system, so battery inverter output is simply "delayed" PV output - then the metering arrangement might be acceptable. If the battery can be charged from mains (e.g. off peak), then it's a no-no, possibly to the point of being fraudulent.

    Likewise is there any co-ordination between the PV inverter and battery inverter? e.g. if the battery is just making up for the lack of PV output at that point in time, there might be no possibility of overload (and logically the two items are behaving as a single appliance).

       - Andy.

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  • 0

    How is the battery charged? If it can only be charged from the PV system, so battery inverter output is simply "delayed" PV output - then the metering arrangement might be acceptable. If the battery can be charged from mains (e.g. off peak), then it's a no-no, possibly to the point of being fraudulent.

    Likewise is there any co-ordination between the PV inverter and battery inverter? e.g. if the battery is just making up for the lack of PV output at that point in time, there might be no possibility of overload (and logically the two items are behaving as a single appliance).

       - Andy.

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