question

Sorry, can't help but keen to see the answer as I'll probably be in the same situation next year.

daza

We have a G99, G100 application awaiting final approval. Our DNO is ENWL. G99 application was made last June. The sent out the offer document exactly 45 days later.

Our system is similar to yours Multiplus 2 48/5000 and an existing 3.42kW AC coupled PV.

The Multiplus is rated at 4.4kW on the ENA site. Applications over 16A (3.68kW) fall into a G99 application. Size of your batteries or any DC coupled PV attached to the Multi are not relevant.

Our Connection offer from the DNO stipulated an export limit of 6kW and the a G100 form would be required. Fail-safe testing is required if the output is greater than 32A (7.33kW) Your output is 4.4kW + 3.21kW = 7.61kW at 230v. It is of no consequence that you say you are not going to export. The system has the capability.

I agree that the DNO application for G99 is a minefield/lottery. G98 is easy, fit and inform DNO. Others here have said phone and discus with your DNO engineer. ENWL seem to only operated by email. They don't answer the published mobile number and don’t reply to phone messages left. So we just plod on via email, overcoming each barrier they put up.

Have you started you application? As far as I know the above information is correct.

See our thread

https://community.victronenergy.com/questions/181563/g100-testing-uk.html

@Fellside i'm completing some of the application as i go. As the DNO allows me to save and edit stuff. But as for the connection my PV is going through AC Out1 so i'm limited by the inverters 4.4kW so essence i can only output a total load of 4.4kW am i correct in this? I only want it this way so grid down my solar is still working and i don't get FIT payment so my energy provider can have just the dregs of what i can't use.

@Fellside now I've got to the point of the application and because its not approved yet, that is the issue that requires you to provide test certs to verify it operates in accordance with G99. i'm going to have to wait till its approved and see if forms 2.3 and 2.4 no longer need completing as the ENA would have satisfied the DNO.

@Fellside so i looked at the DNO's G100 export limitation and as i understand it, i don't need this complicated setup ie apply for G100 as the inverter is limited to 4.4kW and as my AC connected PV is inverter side i can't physically send the grid more than the 4.4kW.

daza

You are correct only 4.4kW total. Our install has 3.42kW on AC in. As it is receiving a FIT payment and cannot be changed. DC coupled PV will be added later to charge batteries if grid is down.

We completed form A1-2 initially then got there offer after 45 days.

Sent back Customer acceptance form.

After install and commissioning sent Form A3-2, Form Appendix B-Export Limitation Scheme Installation and Commissioning Test (G100) and single line diagram (SLD) of the installation.

Since we have an offer document when the 48/500 was still approved we cannot see any problem. But it appears that our DNO thinks differently and is waiting for ENA approval. But they wont tell us that.

daza

As far as I see it if you are over 16A 3.68kW you are G99. The DNO can then set an export limit and that then requires a G100 form. As you are below 32A (7.33kW) G100 Fail-safe testing is not required.

@daza

With all the DNO`s seeming to have different rules its very hard to play there game when we don’t know the rules.

After our exchange of messages yesterday I phoned our allotted DNO (ENWL) engineer and kept trying until someone answered. The guy was very helpful and said that once we had accepted there offer, built the system and sent in the commission documents that wasit. If he was happy and had no further questions, he added the installation to there database. As far as he was concerned that was it there was no need for him the contact us with permission the connect the system. We did not know that and had waited for official permission as some other DNO`s issue.

The engineer did say they were very busy with a lot of applications to work through.

System is now connected.

Now we know the (ENWL) rules things will be a lot easyer.