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Power use from solar panels

C Brown

When a domestic solar system is installed, the DNO supply and inverter supply are physically connected in the same terminal block, supplying the house load.

When the sun is shining and/or the batteries able, the power controller of the solar power system will ensure the load of the house is supplied (up to its limit)

If the solar system has the capacity to supply the house load, what prevents the DNO supply from supplying power to the house load as well (an thus the DNO charging), as the two supplies are connected?

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    If it helps (it might not) and if you can visualize water flow more easily, think of a tap connected by a length of pipe to a huge reservoir - turn on the tap and water flows (at a given rate) turn it off and it stops. Now add a T piece a bit before the tap with the extra branch being fed by a constant volume pump (supplied by a pond or bore hole or something). Turn the pump on while the tap is off and all it's output goes to the  reservoir. Turn the tap partly on and some of the pumps's output will go to the tap the excess still goes up the pipe to the reservoir. Open the tap fully (so it can draw more water than the pump alone can supply) and it'll take all the pump's output plus some from the reservoir. Water can only flow in one direction at a time in a pipe - similarly electrical current.

        - Andy.

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    If it helps (it might not) and if you can visualize water flow more easily, think of a tap connected by a length of pipe to a huge reservoir - turn on the tap and water flows (at a given rate) turn it off and it stops. Now add a T piece a bit before the tap with the extra branch being fed by a constant volume pump (supplied by a pond or bore hole or something). Turn the pump on while the tap is off and all it's output goes to the  reservoir. Turn the tap partly on and some of the pumps's output will go to the tap the excess still goes up the pipe to the reservoir. Open the tap fully (so it can draw more water than the pump alone can supply) and it'll take all the pump's output plus some from the reservoir. Water can only flow in one direction at a time in a pipe - similarly electrical current.

        - Andy.

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