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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.

  • 0 in reply to mapj1
    mapj1 said:
    In relation to nuclear fusion, energy break-even, i.e  more out than we put in was achieved a couple of years ago

    Hm, I might just accept more usable energy out than we put in.

    I must say that I admire TPTB for investing in such very long-term work, which may in fact never be feasible.

  • 0 in reply to Chris Pearson

    A question on inverter voltage level to raise above grid voltage. Does the level of voltage increase with amount of energy generated? I am thinking this may be the case because for example to export voltage level at meter needs to be higher than grid at meter. 

  • 0 in reply to KDY

    Does the level of voltage increase with amount of energy generated?

    The over-voltage is in proportion to the current being pushed back ' the wrong way' into the mains at that time. So the rise, (or reverse voltage drop if you like) on the line in the street is in proportion to power being exported  to grid at the instant of measurement, rather than total generated power at that instant some of which may be used locally, (or indeed the total generated energy, which of course steadily increases the longer it has been running - a voltage rise that did that would be both non-physical and very awkward ;-) 

    (but in a battery to talk about total energy and not just power is exactly right,  as the state of charge does depend on current in and out and time)

    I may appear to be splitting hairs about definitions, and I am sure I know what you meant,  but it is important to be very clear what we mean by flows of energy to and from where ,and the power with which it happens. There is already a lot of misleading bumf out there that is in many cases well meaning but wrong,  and in other cases clearly intended to spread confusion and separate the weak from their savings and I have no desire to add to the confusion.

    Mike,

  • 0

    hello   As non tech Trying to negotiate with a solar supplier  I remain sceptical of industry claims. Oh for an independent arbitrator to explain /corroborate or deny  the claims

    Fusion tests results say more power out than in ?   Pinch salt . Ms O 

  • 0 in reply to Anne Otis

    To what claims are you referring please?

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