NC6 Question

Blakes77

What value do you enter for these? for a 5KW hybrid is it 5,5,5 ?

10-10-20

https://www.boards.ie/discussion/2058419841/nc6-question

No, you take it exactly as it is off the inverter's spec sheet for the first, the solar generation capacity in kVA for the second and the storage in kVA for the third. You thinking it's 5 in all cases makes me think that the commissioning sparks isn't filling in this form as they should. 🤔😁

graememk

https://www.boards.ie/discussion/comment/123643941#Comment_123643941

I think its worded very poorly.

What is actually is storage kVA? Is it what the inverter can pull from storage, then its 5.
Water analogy again, I may have a 10,000 litre tank, but it still only can do 5 litres a minute from the tap…

Generation kVA.. is what the inverter can output.. still 5 - sure there could be more panels, than 5kW but

Blakes77

Yes thats what I mean, storage kva makes no sense unless it was a separate AC coupled battery inverter ? I thought if you put 5 and 5 do they add that together and say right you need an NC7. Btw you can fill in the NC6 yourself and submit it yourself but you do need a RECI to complete the grid setting verification. The form can also be completed online.

10-10-20

https://www.boards.ie/discussion/comment/123644609#Comment_123644609

It's all electrical semantics.

It says "installed behind each inverter" so I read that to require the solar and battery capacity sizing. Solar normally specified in kW of course, and battery capacity specified in kWh! The conversion from each at a pF of 1.0 (unless specified otherwise), so it's just a straight-swap for kW and kWh to kVA.

So 7.5kW of solar panels at a pF of 1.0 = 7.5kVA. etc.

graememk

https://www.boards.ie/discussion/comment/123644893#Comment_123644893

kW to kVA I can deal with. Id still just stick 5 down 😂 as that's all that can be generated.

Storage.. 5 kVA too as there's no conversion. If you wanted to try

If I had 2 15kWh batteries, that could do 200 amps DC each.. at 50 v that's 20kVA!

bunderoon

I've an Safe Electric certified electrician coming tomorrow to install a subboard at garage for lights and sockets. He said he wont do the NC6 form for my DIY solar as its not his own work and that I should contact solar companies - who I think wont even entertain this.

I've done a tidy DIY job. Based in Mayo. Hopefully tomorrow when he sees what I have done he may change his mind.

If he doesnt, does anyone from Mayo know someone who would certify it? I can share pics any any other details if needed.

Thanks in advance.

blinking

https://www.boards.ie/discussion/comment/123736900#Comment_123736900

No one will certify someone else's work, especially as connecting an inverter is legally an electrician only job.

bunderoon

https://www.boards.ie/discussion/comment/123736908#Comment_123736908

I haven't connected the inverter to the subCU. The DC side is done. But not the AC. So the inverter is not just islanded but also won't produce as it can't sense the mains as there is no path to it yet.

Buffman

https://www.boards.ie/discussion/comment/123737030#Comment_123737030

Have you specifically asked him to connect up the inverter AC side as part of the other main job and he's refused the work?

bunderoon

Yeah, I have. Hoping when he sees it he'll see it's not some dodgy DIY setup.

Electricians are few and far between in my area so will settle for the subCU install at worst case. I think its that he just doesn't have experience in Solar and probably just doesn't know its an AC switch connection to a 100ma RCBOnand safety tests. The inverter is 1 year old, was installed by the Active'x' company and it was removed due to the owner wanting a hybrid instead after the storm. So I bought it second hand on adverts. 4kw solis

Buffman

Ye, a lot of sparks unfamiliar with it think solar is some sort of voodoo magic and will shy away from it.

Tell him exactly what's required when he's looking at it, presumably you've all cables ran and he just needs to install and connect RCBO.

Tell him it's the same as doing an immersion, actually easier as you don't need a 4 core cable!

Tell him you only need him to fill in the rec section of the NC6 and you fill in the rest.

The good thing about a used inverter is no setting up required, it will just work away like it was in the last house with the presumably correct settings.

bunderoon

Exactly. Thanks for the comments. That's the plan, so hopefully he'll change his mind.

In subCU, 25A RCBO for internal sockets, 25A for outside sockets that will be about 30m away from subCU. 4sq cable swa for outside ones. 6A MCB for internal lights. A 100A breaker. 25A 100ma RCabao for inverter. And free slots for any future upgrades (have a field with space for more panels). 10sq swa to connect subCU to house. 40A MCB for house side CU to 10sq SWA.

2 strings. Roof is 5 x 550w at about 17degrees and 4 x 550w at 90 degrees. We get loads of wind so not chancing any angles on the front facing. All mounted on 44mm unistrut.

Buffman

Looks well, seeing as you're specifically getting in the REC to wire up that CU entirely, I can't see him having any logical reason to not complete the PV circuit as that would be leaving an incomplete job.

Hope it goes ok for you. 👍🏻

10-10-20

It's mounted on a flammable surface, that's a significant no-no.

graememk

https://www.boards.ie/discussion/comment/123737790#Comment_123737790

Although not the hardest to fix, I think I got something like "non asbestos fire board" or something in my local hardware store when i was getting stuff ready for my solar install in the farmyard

10-10-20

https://www.boards.ie/discussion/comment/123737830#Comment_123737830

It's an easy fix, sure. Fire-rated cement board will do it.

https://www.tilemerchant.ie/12mm-fire-rated-cement-backer-board-244x122cm.html?srsltid=AfmBOopDbBTM1Yfg8sZk1_Y7Q7VBFeZ92KZ94mN1pYDqEav-MvQ_1Cru

graememk

https://www.boards.ie/discussion/comment/123737840#Comment_123737840

that was my other option, the stuff i used is only 1/4" thick, much easier to handle. -Its mounted on a stone wall, so battened it out with laths and long concrete screws, got a hold of a couple of good stones in the wall, then 3/4" ply then the fireboard. - thats why i was prepping the mount rather than the solar installers