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When installing PV the local distribution network operator (DNO) needs to be told if the installation is more than 3.9Kw (ish). For those in the know the G59 form, which was the route for this communication, is now defunct and the new G99 process is order of the day for grid connected PV schemes above 3.9Kw, ours will be around 7.5Kw so we need to go through the G99 process, via form A1-1 (simplified). Before I ring UK Power Networks I was wondering if anybody has been through G99 and can give me a heads up on how it was for you. I want to avoid using more than one phase because of the extant cabling and the dangers of having using more than one phase across what it otherwise a domestic site. So I am going to try that approach first. One thing I have not provisioned for is the G99 relay I suspect I need in here somewhere, I guess it goes just after (on the way in) the incomer breaker? Although relays seem a lot less 'talked about' nowadays! Our schematic of 2017 is attached and I am also wondering how I might control this so I don't end up exporting the battery output or, more importantly, using it to charge the EV (our next car will be an EV) and then have nothing to get us through the night. I wonder if the various inverters are / some are able to cope with this complexity without active control? Any observations gratefully accepted - perhaps I have more than 2 problems?
