DNO limited export, oversize array storage options - Solar Immersion Diverter or battery

24 Posts


Hi,
Just after some practical advice please as i'm struggling to find info online.
Our export with the DNO is limited to 3.68kwh. we are a large family and would like a bigger array, so am wondering what options there are to store excess.
We're proposing an 8kw array (all on the same orientation) that would be clipped to 3.68kw export, if we're generating over 3.68kwh what storage options are available that could use the pre clipped energy on the DC side?
Is there an immersion diverter that will use this? e.g. if the array was generating peak circa 8kwh and we were self consuming the inverted AC 3.68kwh, could the immersion diverter use the remaining output? or would it be lost without a battery?
I understand that a hybrid inverter with battery could be used that would store in DC, we dont really want to go down that route at the moment as we have a 500 litre unvented cylinder that has potential.
Thanks
Just after some practical advice please as i'm struggling to find info online.
Our export with the DNO is limited to 3.68kwh. we are a large family and would like a bigger array, so am wondering what options there are to store excess.
We're proposing an 8kw array (all on the same orientation) that would be clipped to 3.68kw export, if we're generating over 3.68kwh what storage options are available that could use the pre clipped energy on the DC side?
Is there an immersion diverter that will use this? e.g. if the array was generating peak circa 8kwh and we were self consuming the inverted AC 3.68kwh, could the immersion diverter use the remaining output? or would it be lost without a battery?
I understand that a hybrid inverter with battery could be used that would store in DC, we dont really want to go down that route at the moment as we have a 500 litre unvented cylinder that has potential.
Thanks
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2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 2.5kw inverter. 28MWh generated, long-term average 2.6 Os.
Export limitation would be usually G100, I would look for inverters which are already certified for G100.
System 1 - 14 x 250W SunModule SW + Enphase ME215 microinverters (July 2015)
System 2 - 20 x 330W Jinko Panels + Enphase IQ7+ microinverters (Jan 2022) + Givenergy AC Coupled inverter + 2 * 8.2KWh Battery (May 2022) + Mitsubishi 7.1 KW and 2* Daikin 2.5 KW A2A Heat Pump
Batteries may be an option for the future, for now immersion storage seems like the most economical thing.
System 1 - 14 x 250W SunModule SW + Enphase ME215 microinverters (July 2015)
System 2 - 20 x 330W Jinko Panels + Enphase IQ7+ microinverters (Jan 2022) + Givenergy AC Coupled inverter + 2 * 8.2KWh Battery (May 2022) + Mitsubishi 7.1 KW and 2* Daikin 2.5 KW A2A Heat Pump
I suppose i will have to apply to be sure.
Thanks for the advice on the inverters, atleast i know it's possible to oversize (over export limit) and still use all generation.
- Unrestricted export - Your full generation/Inverter output capacity
- G98 limit of 3.68
- Limited export - Any value depending on the local grid
- Zero export - Depending on your local grid.
I hope the DNO lets you export at least 3.68.System 1 - 14 x 250W SunModule SW + Enphase ME215 microinverters (July 2015)
System 2 - 20 x 330W Jinko Panels + Enphase IQ7+ microinverters (Jan 2022) + Givenergy AC Coupled inverter + 2 * 8.2KWh Battery (May 2022) + Mitsubishi 7.1 KW and 2* Daikin 2.5 KW A2A Heat Pump
I'm not sure the DNO can limit the export of a domestic property below 3.68kW? Because up to 3.68kW is G98 notification and you don't apply in advance for that.
So I think your third possible outcome should be "Any value above 3.68kW, depending on the local grid."
And the 4th outcome is not a possibility.
(This is only applicable if you are a domestic property. If you are a commercial property, ignore everything I just said and @ispookie666 's comment stands in full)
G98 is notification after completion of works, I presume this does not mean automatic approval from DNO.
If I was DNO, with the scrutiny on finances and having to eat profit - I'd look at low hanging fruit a and domestic generation looks very appealing 🤐.
System 1 - 14 x 250W SunModule SW + Enphase ME215 microinverters (July 2015)
System 2 - 20 x 330W Jinko Panels + Enphase IQ7+ microinverters (Jan 2022) + Givenergy AC Coupled inverter + 2 * 8.2KWh Battery (May 2022) + Mitsubishi 7.1 KW and 2* Daikin 2.5 KW A2A Heat Pump