Answer / k.prakashchandra

Incoming power has to be equal to the load.

Answer / aks

Incoming Power rating just says how much max current can be drawn from the source. And protective devices can handle this current. No question of saving or excess power in this case. Bill will be calculated for 8 kW only provided tariff does not speak for MD. In this case consumer can connect additional load of 3kW

Answer / e. segovia

Here we have many things to consider, ideally power in must
equal power out, however no system is 100% efficient,
remember that EFFICIENCY = (POWER OUT/POWER IN)*100%. It
would be fantastic if this worked out to be 100%.
Nonetheless in your case you would be wasting too much
power in your primary system, so consider the efficiency of
your system and try to match your input power with your
output power according to the efficiency and to your
requirements.

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