5.18 kWp PV systems (3.68 E/W & 1.5 E).
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Need Help New Solar 8kw Install

Danno2k
Posts: 9 Forumite

Looking for help, if you guys have the time to help
I was looking to get installed a 8kw solar system installed at my home, but i was told if i go over a 3.68kw inverter i need G99 application
Which is hard to get ? as your not allowed to send more than 3.68kw down the grid without this
What would be my best option
1, Go off grid and send nothing down the grid, if i'm still allowed to install the 8kw system ?
Not sure if you still need something still for me to install this size
2, Go smaller and install battery's ?
I use are 7000k a year in power
Thanks
I was looking to get installed a 8kw solar system installed at my home, but i was told if i go over a 3.68kw inverter i need G99 application
Which is hard to get ? as your not allowed to send more than 3.68kw down the grid without this
What would be my best option
1, Go off grid and send nothing down the grid, if i'm still allowed to install the 8kw system ?
Not sure if you still need something still for me to install this size
2, Go smaller and install battery's ?
I use are 7000k a year in power
Thanks
0
Comments
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Danno2k said:i was told if i go over a 3.68kw inverter i need G99 application
Which is hard to get ?Danno2k said:1, Go off grid and send nothing down the grid, if i'm still allowed to install the 8kw system ?
By the way, your annual electricity usage is measured in kWh (kilowatt hours).7.25 kWp PV system (4.1kW WSW & 3.15kW ENE), Solis inverter, myenergi eddi & harvi for energy diversion to immersion heater. myenergi hub for Virtual Power Plant demand-side response trial.1 -
Danno2k said:Looking for help, if you guys have the time to help
I was looking to get installed a 8kw solar system installed at my home, but i was told if i go over a 3.68kw inverter i need G99 application
Which is hard to get ? as your not allowed to send more than 3.68kw down the grid without this
What would be my best option
1, Go off grid and send nothing down the grid, if i'm still allowed to install the 8kw system ?
Not sure if you still need something still for me to install this size
2, Go smaller and install battery's ?
I use are 7000k a year in power
Thanks
https://www.argandsolutions.com/g100-export-limitation
3 -
From everything I've read, going off grid is waaaay more expensive and way more hassle, as you would need something making power in the winter when solar is poor.
I was a 7mwh consumer before solar, I've added an ev as well so probably more like an 8.5mwh consumer now, but with solar and batteries I'm only buying around 2000kwh at full price and probably another 2000kwh at 5p over the winter.
Batteries will help with self consumption, as would a solar diverter to heat up your hot water tank if you have one, but.... if you are looking for a 10 year return on investment, you will likely struggle to do that with batteries as they are so expensive to buy in the quantity (kwh) that you would need to cover the house.West central Scotland
4kw sse since 2014 and 6.6kw wsw / ene split since 2019
24kwh leaf, 75Kwh Tesla and Lux 3600 with 60Kwh storage2 -
DNO applications do take a few weeks (about 3 months in my case). I had a 7kWp array installed last September with a PW2 battery. There was a £350 application fee and the possibility of an extra fee for a witness inspection. My installation was approved with a 5kW export limit: in truth, as my panels are arranged on two roofs 90 degrees different, the limit does not constrain my output. DNO sign off post installation took another couple of months. If you want SEG payments then some suppliers are insisting on an MCS Certificate, and DNO approval. The latter is required to get an export MPAN. It looks like a simple way for DNOs to check that people haven’t been circumventing the approvals process.
I found this blog helpful:
https://blog.spiritenergy.co.uk/homeowner/dno-permission
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