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Solar feed from shed panel back to house permitted?

  • 15-08-2023 12:51pm
    #1
    magformer
    Registered Users, Registered Users 2 Posts: 11 ✭


    I have a shed wired to the house with a SWA cable from a 63a breaker in the house consumer unit to a subpanel in the shed.

    I have limtied space on the roof of the house and am trying to work out whether I could install PV panels on both the house and the shed. I would also install a separate inverter in the house for the main array.

    Would it be permitted by electrical regs to have an inverter feeding into the shed subpanel and then back to the house?

    If so, any obvious issues with running two separate arrays feeding into the same consumer unit?

    Thanks.



Comments

  • #2
    10-10-20
    Registered Users, Registered Users 2 Posts: 8,073 ✭✭✭10-10-20


    Yes, it can be done as long as the total size of the inverter outputs are less than the NC6 mandated 25A/5.7kW.

    Had you planning on installing batteries?



  • #3
    magformer
    Registered Users, Registered Users 2 Posts: 11 ✭magformer


    Thanks v much - I hadn't even considered the total size limit would need to be split between the inverters so very helpful to know. I need to firm up estimates as to how many panels are feasible. Challenging because I'm dealing with awkward sections of flat roof. The shed roof is quite large which makes it worth considering, so great to know that's at least an option.

    I had hoped to install batteries initially but had probably been optimistic about possible system size. Daytime consumption is reasonably heavy so I need to do some monitoring to work out whether excess generation is realistic.

    Sorry for another basic question, but do hybrid inverters exist that could simultaneously control battery charge from both a DC input (say the main array) and AC input from the inverter for the secondary array (accepting there will be some conversion losses)? I guess this is comparable to AC charging from the grid which I know is possible, but here I think I would need both charging sources simultaneously.

    Alternatively, maybe I'm overcomplicating it or more likely misunderstanding - could I just have a battery inverter on the AC side of the system that charges where there is surplus, regardless of the breakdown between array outputs?

    Splitting the system like this would seem to introduce lots of variables.



  • #4
    10-10-20
    Registered Users, Registered Users 2 Posts: 8,073 ✭✭✭10-10-20


    A standard hybrid and a secondary grid-tied inverter will do that I think if the hybrid has a CT on the grid connection. The hybrid will watch the export rate and send additional power to the battery, unless the battery is full when at that point it will also go into export mode.



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