“if your are really that close to meeting G99 /G100 your crap installer should have picked up on this prior commencing the install and an application made to the DNO. Its not necessarily the size of the the array DNO are interested in, it’s the inverter and it meeting type approved to meet G99 say. Many a time I’d regularly ask if the network would take more than 16A back feed and most of the DNO staff were very helpful, except you always get one, who was a right jobsworth and would continually state 16A maximum, but if your limited to 16A they can’t stop work commencing and any network issues that arise are not chargeable.
There are ways around it G98 is based round export limatation, options include G99 but, also workarounds such as reducing panel size to 4kWp with a view of adding panels and battery storage at a later stage, with the involvement of the DNO or a bigger inverter (fotget what size yours is) and limit it to around 3.68kWp export but, there is no escuse for bad workmenship, only finding out at this stage the DNO should have been involved from the start, if you are actually close to the limit.
Most DNO’s are helpful if you approch them however alot rests on the upstream downstream limits your local transformer can hand which might be what the other guy was talking about but, if there’s no issue with capacity, Ive known DNO’s to carry the work out withou charge.
Might be worthwhile reading the Engery Networks association on G98/G99.“
Im not sure I described my situation clearly. I have G99 approval for my original system installed October last year which has the air source heat pump, 11840 kWh solar together with an 8.8kw Sunsynk inverter and a 4kw Aurora string inverter, which is part of my FIT payment set up.
I was looking to add a second 8.7kw inverter and an additional 4kw of solar however after speaking to my new installer and considering my options I’ve decided to stick with the two inverters, meaning no need to get another G99 approval, and just accept that with the additional 4kw of solar I will have some clipping of the output on really sunny days.
I have sent this to my new installer but he hasn’t came back to me yet so don’t know if he’s ok with what I’m proposing.
There are two array that feed my 4kw inverter for the FIT payment, with the increased panel output, 240watt original to 480watt replacement, only one array will now be associated with the FIT payment and will be connected to the 4kw inverter. The other array will be connected to my 8.8kw hybrid inverter meaning 12,000kw, probably about 10,000kwp, will go through the 8.8kw inverter meaning I will have some clipping but only on really sunny days.
kezo if you see anything completely incorrect with the above let me know.
The only person who got all his work done by Friday was Robinson Crusoe.
Anything i post over three lines long please assume it is an article lol.