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How does a main board know when to draw power from the grid or an Solar PV inverter?

newbieuser

Hi,

It might be bit silly but how does a main board/busbar etc know when to draw power from the grid or an inverter? Lets say its sunny and your PV system is generating plenty, how does the main board decide to supply the loads via the inverter and not the incoming fuse cutouts? Similarly, how does the excess current flow back to the nearest substation ?

Thanks.

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    newbieuser said:
    how does the main board decide to supply the loads via the inverter and not the incoming fuse cutouts

    I think that you mean get its supply from the inverter or cut out.

    If the load is high, both sources will push the wiggly amps through it, rather like two batteries wired in parallel. If the load is low (or nil), the inverter will supply a neighbour instead, but if the neighbour is closer to the transformer, it may have to raise the voltage a little.

    I doubt that the current would have to go all the way back to the transformer, but it is an interesting question. What if the whole street has PV, the sun is shining brightly at midday, and everybody is out at work and, accordingly, consuming nothing?

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  • 0
    newbieuser said:
    how does the main board decide to supply the loads via the inverter and not the incoming fuse cutouts

    I think that you mean get its supply from the inverter or cut out.

    If the load is high, both sources will push the wiggly amps through it, rather like two batteries wired in parallel. If the load is low (or nil), the inverter will supply a neighbour instead, but if the neighbour is closer to the transformer, it may have to raise the voltage a little.

    I doubt that the current would have to go all the way back to the transformer, but it is an interesting question. What if the whole street has PV, the sun is shining brightly at midday, and everybody is out at work and, accordingly, consuming nothing?

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