LB: for anyone reading who wonders "why /can't/ they feed the solar power into the genset powered grid?", this is because if there is a fault on the network, without correct protective equipment the solar panels could cause 230/400V to appear in places where it is not expected to be - which can be very bad for those trying to fix the fault!
(synchronisation and balancing of power supplies is also non trivial, as we in England learned the hard way yesterday)
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