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Battery with existing PV - regulations

 
Energy Storage
Last Post by JamesPa 1 hour ago
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 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 3541
Topic starter 25/11/2025 5:08 pm  

Im now looking again at batteries because recent changes in tarifs (which are no surprise and I suspect are the direction of travel) have altered the equation. I have grid tied solar and I am looking at grid tied AC coupled batteries.  Ideally I would want islanding to be possible to cover power cuts and 3.6kW output maybe a bit more

At this stage I am trying to get my mind around the regs.  As I understand it

a) even if the battery inverter is set so that it does not discharge when this would lead to export, I still need G99, which will need to specify both inverters, because the DNO assumes it might export.  This might limit the max output of the battery inverter even though its not intended to export

b) If the inverter does support islanding, there must be a suitable cut out device between the supply and any part of the internal wiring that will be energised during a power cut, to ensure that nothing is fed back to the grid in this circumstance

Have I got this correct?

Also, has anyone looked seriously at sodium ion batteries.  They seem to be obtainable and are, at least prima facie (but who knows what happens under the hood), more ethical in production and lower fire risk.

Sorry to ask simple questions, Im starting on a new learning curve here!

 

 


This topic was modified 1 hour ago 2 times by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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