G77 connecting to grid

[jotec]

Hi,
I have seen an old sunny boy that is 1, cheap and 2 G77.
Is this still viable to connect , legally, to the grid or has it got to be g83?
Dick

[Ivan]

G77 was automatically included in the G83 standard, so it should be ok to use it.

[jotec]

Thanks Ivan, I will see how it goes.

[jotec]

Hi,
For info.
I have been in touch with my DNO -central networks -and they will not accept g77 connected to the network.

D ick

[Iain]

Hi
Can the settings be reprogrammed to the G83 standards or is there more to it?
Iain

[ecogen]

[G83/1-1. Annex C. PV.
C1. Certification and Type Testing General Arrangements.
Typically, all interface functions are contained within the inverter and in such cases it is only necessary to type test the inverter.
Note 1. an inverter previously certified to G77 type testing is by default considered as being certified in accordance with G83/1-1.]

The above has been taken from Annex C which is the guidance for type testing PV.
G77/1 was for up to 5kVA PV and withdrawn in 2002. To allow G77/1 installations over 16A per phase to continue, G83 gives the DNO the opportunity to consider All SSEG technology rated above 16A per phase.
If you were installing PV then your DNO should not refuse connection on the basis of a G77 type tested inverter.
In regard to DIY CHP utilising an inverter, it is not unreasonable for a DNO to want to follow section 5 Requirements.
Basically a G83/1-1 type tested inverter will cover most of it.
You might find something to clarify this matter in the OFGEM archives, in respect to the change from G77 to G83.

[jotec]

Thanks for that ecogen.
I did point out that g77 was considered as being with the g83 specs but they want g83 so that is what it will have to be.

[linesrg]

Dick,

That doesn't mean that your DNO can't be challenged surely??

Regards

Richard

[jotec]

linesrg
I agree but as I do not have a g77 buying one in the hope that I can challenge the DNO successfully seems a bit of a risk and more grief being passed from pillar to post than I want. When working with 'the powers that be' I find it easiest to follow their instructions unless there is a real reason to challenge them.
At the end of the day I just want to connect to the grid as easily, and cheaply, as possible.
Dick

[Ivan]

I think the person that you've been speaking to is not informed on the subject. I'd suggest writing a letter to them and insisting on a written response. Ask why they are not complying with the recommendations laid out in G83. Quote ecogeorge's post below, so that they don't have to look it up. Expect a quick U-turn. Don't forget that most of these guys think their job is to fob you off wherever possible.

[jotec]

Point taken Ivan but things have now moved on and I am getting g83 gti next week.
Dick

[GavinA]

I think the person that you've been speaking to is not informed on the subject. I'd suggest writing a letter to them and insisting on a written response. Ask why they are not complying with the recommendations laid out in G83. Quote ecogeorge's post below, so that they don't have to look it up. Expect a quick U-turn. Don't forget that most of these guys think their job is to fob you off wherever possible.

unfortunately they have 45 days in which to reply to you, so insisting on a written response may simply result in a long wait, and they appear to hate to have to admit that they're wrong.

not that I'm still waiting for a response to something or anything....

[Ivan]

Bill them for an unnecessary purchase. Legally they are responsible for your costs if they advise you incorrectly, and you are out of pocket as a result. Sometimes I think it is important to push the message home that messing people about just to be awkward or because you aren't aware of the rules you are empowered to enforce carries a price.