G99 application help needed.

[jimseng]

Hi. I'm new to all this so I am trying to find my way. I am just submitting a G99 application well in advance of installing solar on my new build. I just need help with the G100 part. I was planning on using something like a Victron 48/10000/140-100, mostly because I already have Victron gear on my boat and so familiarity etc. I don't have to, I haven't got to that stage yet. I need help getting this G99 application started. Can someone help me out with the G100 part and make suggestions. I don't expect the roof to be built for another couple of months but I am planning on 10.2kw PV and G98 isn't going to work for me. Do I need to be looking at alternative inverters or something else?

Thanks

[jimseng]

I should add, I'm not actually interested in exporting to the grid, I think I can find ways of using the energy, even when my batteries are full. But <3.6kw inverter isn't going to cut it for me.

[Thorfun]

If your inverter of choice already has certification then it should be pretty straightforward. Ours was solaredge so it was easy. 
 

but I went through this quite a while ago so can’t really remember! 
 

I think I posted about my G99 application on here though so might be some information in there if you can find it. 

[jimseng]

The Victron Multiplus has certification for G99 but I don't believe it has for the G100 part. That is the bit I need guidance with. Is it just a case of choosing a different inverter which satisfies the G100 requirements?

[Dillsue]

2 minutes ago, jimseng said:

The Victron Multiplus has certification for G99 but I don't believe it has for the G100 part. That is the bit I need guidance with. Is it just a case of choosing a different inverter which satisfies the G100 requirements?

Yes. If you want to implement export limitation you need an inverter with G100 certification. I think someone posted on here recently about Multiplus not having a G100 cert but it may have been a specific model?? You can do export limitation external to the PV inverter but it's a specialist field likely with special price.

 

Have you spoken to your DNO about what export limit they are likely to allow? We have consent for 7.4kw so we could use a 7kw inverter and wouldn't need to bother with G100, we actually use 2 x 3.68kw. Fair chance a 7kw inverter will accept your 10kw of panels particularly if they aren't all facing the same direction.

[jimseng]

Quote

Have you spoken to your DNO about what export limit they are likely to allow?

It seems to be a chicken and egg situation. I spoke to the DNO and they said I need to submit a G99 application for them to consider. I think I'll send one off and see what comes back.

 

[Johnnyt]

I asked for a budget request with Scottish Power details of reply below.

I got 9kW export limitation but no G100 as I used my existing solaredge 6kW inverter and fitted a new 3kW inverter. 

This is fed by a 14.8kWp array with3 X solaredge dc coupled energy banks totalling 29.1kWh.

It was a breeze.

 

Thank you for your recent email enquiry requesting a budget quote for possible generation installation at your property. 

Unfortunately, we are unable to provide available capacity for a site.  You would need to submit a budget request for the load details you are looking to install. 

We would then raise a connections case and our Design & Planning Team would then be able to carry out network availability for the required load details.

You do not need to submit an application at this time but, in order to raise a budget request, please provide:  

• Applicant and site contact details (please provide contact name, address and telephone number)
• Location Plan (Geographical location of site)
• Generation (export) details

If you have any other questions, please do not hesitate to reply to this email or call us on the number below.  Our office hours are 08:30-16:45, Monday to Friday.

Regards,
James Dey
SP Energy Networks Contact Team
320 St Vincent Street
Glasgow
G2 5AD

[jimseng]

Quote

I got 9kW export limitation but no G100 as I used my existing solaredge 6kW inverter and fitted a new 3kW inverter. 

So are you running the two inverters together? 

[Johnnyt]

I am,

 

The 6kW inverter generally charges the batteries from PV and mains overnight.

The 3kW inverters generally serves the house load.

 

Both export excess AC when batteries full surplus from house load.

 

The excess AC from 3KW can, at times, also charge batteries via any headroom from the 6kW inverter.

 

Sound complicated but it works well. If I have confused matters, I could supply data logs.

 

[Johnnyt]

I have 4.25 kW of panels feeding into 3kw inverter and circa 10kW array feeding  6kW inverter.

The excess generation over the inverter limits goes directly to the batteries in DC.

see screenshot

 

The 3kW inverter can actually deliver 3.2kW ac