Electronics > Power/Renewable Energy/EV's

Islanding and regulations.

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ejeffrey:
I'm not familiar with the UK certification, but this claims to be a G98 certificate for some models of the victron multiplus ii:

https://www.victronenergy.com/upload/documents/Certificate-ESS-G98-1-2021-MultiPlus-II-48V-3k(GX)-48V-5k(GX)-24V-3k(GX).pdf

There are obviously a bunch of different part numbers, and not all of them are covered, but if you got a non-UK inverter and then can't get the certification that it meet UK requirements, that seems to be on you, not the regulations.

paulca:

--- Quote from: ejeffrey on March 30, 2023, 06:00:43 pm ---I'm not familiar with the UK certification, but this claims to be a G98 certificate for some models of the victron multiplus ii:

https://www.victronenergy.com/upload/documents/Certificate-ESS-G98-1-2021-MultiPlus-II-48V-3k(GX)-48V-5k(GX)-24V-3k(GX).pdf

There are obviously a bunch of different part numbers, and not all of them are covered, but if you got a non-UK inverter and then can't get the certification that it meet UK requirements, that seems to be on you, not the regulations.

--- End quote ---

It is a UK inverter.  It's only their latest and greatest they have, so far, rather tardily, retro-actively certified.  A lot remain in "Needs more information" status.

However.  More than one person has stated that their DNO accepted their system without the certificate, larger systems too.

The reg update was 2 years ago.  Victron just didn't pre-emptively certify.

It is likely that as they all share the same architecture and some are certified... and... it's so low output which is more likely to let out it's smoke than even cause a blip on the local grid, they will be more annoyed that I asked.

Looking at the inverter on the shelf, the only reason I'm not powering it up right now on a bench power supply is I've had 2 beers.  That's 2 more than the mains voltage limit for me.

I do intend to test it fully.  I believe that is at least afforded at my own risk with such a small prosumer grade unit.  No electrical circuits needs to be created or modified for that to occur.

Sounds plausible, no?

The other way I see it can be justified is... as intended... grid mains is only "shore power" for an otherwise islanded off-grid mobile home... it's just I forgot to put wheels on my garage.

paulca:
The DNO finally got back in touch.  In summary:

If it is hardwired to their network, ie.  installed on a circuit permenantly, they need to be notified under G98/NI. 

Additionally you need to be careful what you tell them, as they were very much ready to include the total throughput, including grid power of the invertor at 3.6kW and add the 1kW solar as additional 'generation capacity'.  That results in going over the G98/NI regulations and would require prior permission and much tighter regs and more paper work.

Thankfully however when I explained the system a bit more the sofetned and when I asked, "Does it make a difference if I do not hardwire it, but instead have it isolated from my AC except for a single plug socket which I can plug in to charge the batteries and help keep the inverter in phase just for safety... "  They responsed that would indeed make a difference and as far as they would be concerned it's a plug in battery charger or generator and do not require notification, no interest.

Excellent.  Just an earth rod and a coupled of MCB/RCDs.

kaz911:
I applied for 12 kW solar and 38 kWh battery - with Victron Quattro 10k on UK Single Phase 100A.

I used a "specialist" company for the application to the DNO - and I got approval within 2 weeks but with 5k5 export limit.  The approval is valid for 12 months (so you can install anytime and then notify about installation)

The Quattro is the older generation - so I have external Ziel anti-island device. Basically a control box with 2 "mains" relay's in it.

New "Quattros" and "mulitiplus" have the dual relays.  (A quattro is just a multiplus with 2 x AC inputs)

But the reason for the big application is you "reserve" capacity. The more of your neighbours gets solar and export, the less is available unless the DNO upgrades lines or trafo-stations. So I thought I'd make certain I could fill as much as possible - and then just modify upon installation completion. But until then no-one can claim from my pie... and as the people around have monster big houses compared to ours - they might catch on at some point.

/k

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