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Applied for my g99 just out of interest to see what they will allow
So I have applied for my g99 just out of interest to see what they will allow
My main reason for tip toeing around the authorities is because I have a very early grid tied 3.8kw system that pays 50 or so pence a kWh and is still valued for another 10 years
So I don’t want to jeopardise that,
I’ve applied for a Sunsynk 16kwh single phase inverter, 20kwh of panels and 64kwh of storage, I’m not interested in drawing from the grid or exporting to the grid but will if possible, but also happy with this system off grid.
The inverter seems flexible enough you can set the parameters to what they allow
I just want to start buying the materials now because some of it is on back order can I just crack on with that plan
Hopefully that won’t annoy you know who.
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16 Replies
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Be careful with buying the inverter before acceptance by the DNO, even if not exporting they can limit your inverter size. This is due to any potential fault that could occur. If not connected to the grid in anyway, then it doesn’t matter.
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not quite true they can’t limit what you buy only what you can export
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They can limit the size of the inverter you want to connect to their grid! They tried to tell me I couldnt connect a 16kw inverter as its too big, turns out 15.5kw was the max they would allow me – however after a few conversations and talking to the manager at the DNO, it was so close they allowed me in the end. Its to do with potential faults on their lines…
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I have just put in the paperwork for exactly the same setup as you are asking for. They have accepted the paper work and now I’m waiting for a ‘quote’ for them to check whether the supply can take 16kw export, they have 2 months to just give me the quote
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I’m probably no where near the number crunching your be at but my instant gut feeling is the export payments probably won’t cover the damage of the battery so possibly not worth doing
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Justin Day I’m coming to the end of self building our fairly large new home which is fully electric with two heat pumps and EVs etc. numbers so far show a net gain over the year I.e. they will pay me so house and cars will run for ‘free’, pay back on investment side is around 4 years, based on me doing the install. This is based purely on solar export, I could improve the return / profit by charging the battery fully overnight and selling it back during the day, I may do this as well, but backup plan at the moment is if they limit my export I can charge the battery from solar then export over a longer timeframe / slower rate. Only condition from SSEN is they will charge me an inspection fee to check the system is installed to their standard.
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Export payments will cover the wear cost of the battery many times over.
If your 64kWh battery is a Fogstar stack then 8000 cycles at, say, 50kWh is 400,000kWh over its lifetime. At £6k for the battery that’s only 1.5p/kWh.
With Octopus still paying 12p/kWh for export storing solar energy for later export is very definitely still worthwhile.
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Are you on a domestic single phase supply? If so and you have a 63A incoming supply then they would only consider an application specifying a G100 compliant export limiting device, limiting to at most 15kw. If you have a 100A incoming supply then the DNO might consider your application with just the G99 compliant inverter.
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I’m not sure if there’s actually 100amp fused fitted but as you say the sticker does say there is
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are you sure they are 100a fuses ? Or it just says 100a on the fuse holders ? They came out to check mine as apparently they don’t use 100a fuses anymore due to fire/safety issues.
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If your original system is on the FITs system, don’t do any major upgrades without checking if it will affect your payments.
If you are looking at putting another system in that’s not grid tied then you don’t need to speak to the dno as it doesn’t involve them.
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i dont think it affects the original FIT payments, they are kept separate. just as long as the FIT meter is all connected and power produced is measured by that then it just keeps on going for the contract term. SEG payments are separate.
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I’m sure if I set the inverter up in a off grid configuration they would still Deem a problem as it would still connect to the house supply which the FIT payment system does
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I opted for 2 8kW SS inverters as that was cheaper than the 16 and gave me 4 strings (some redundancy and easier for fault finding).
Have worked flawlessly together for a couple of years now.
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I had a similar situation where I had a 2011 G98 installation of 3.5kW and upgraded to 8.6kW. I still have my FIT but get 3.5 / 8.6 (40.7%) of the meter reading – it is prorated
In your case if you went from 3.8 to 20 you will get 19% of the export meter reading, plus you can moved away from DEEMED export for everything else
You can change all the old panels for new, new inverter etc without losing your FIT under a Government decision some years ago
Happy to help if you want more info – just shout
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ok thanks @zac
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