DNO Limits

Hi all. Been lurking on this forum whilst I wait for my 2xAC3 inverters and 2x9.5 batteries to be installed (ordered back in May). I have no solar, this is to be a battery only install.

My installer called me yesterday to say that the DNO application had been rejected as the maximum they would allow me to install would be 5kw rather than the 6kw (2x ac3 inveters) i have planned.

I do not plan to export anything to the grid at all - the batteries will purely power my house.

My reading so far as suggested that a g100 application might do the trick and that the GE inverters are certified to limit/block export to the grid?

Just wondering if I'm correct and if anyone else has encountered a similar situation?

GivEnergy can set an export to grid limit of 5kw, so no problems at all. I think you or your installer will need to call them.

Your engineer installer can set the Export limit to 5kw on each of the inverters.

So if either see;s over this, they back off. Exactly what I have, but SOlax/AC3

I'm not sure about G100 - if you have multiple inverters does the export limit apply to the total possible export? If that is the case then your inverters will have to be set to 2.5kW each. Or if the inverters share a single EM115 can they limit the total export. Not sure.
Note - many installers are not bothering to get DNO approval for battery systems. I asked the DNO what happens if you have no approval - silence then 'we could disconnect you from our network'.

Regardless of having 1 or 2 x EM115, they are measuring the same grid export, so both AC3 would have the same limit of 5 kW export.
I know the OP does not have solar PV, but could have, and this would be a 3rd generation system in parallel with the 2 x AC3. Again all the systems would require the same 5kW export limit to meet the DNO requirements.

Slartibartfast many installers are not bothering to get DNO approval for battery systems.

Then many installers are not complying with regulations. You need to get DNO approval for any micro-generation system and without that you won't get a SEG tariff. For less than 3.68kW installed capacity, I don't believe the DNO can refuse but the G98 can be completed retrospectively. For installations greater than 3.68kW capacity, you have to get approval before the equipment is connected. The DNO can require you to limit export to 3.68kW (or another value that they determine), but AFAIK they can't refuse you permission to install as long as the equipment is type approved to G98/G99 and G100 from spring next year. The DNO is responsible for your local distribution network and really do need to know what is installed where.