PV Installation Three Phase Guidance

[SourceSolar]

Why not use SMA tripower inverter 3 phase, one inverter, one generation meter about 2700 quid cheaper than 3 sunnyboy 3000 one installation no need to notify dno.

 

[Nickyrox]

That sounds good to me mate.
I gave the UK supplier a call today and they couldn't give me too much on technical advice.
Told me to call back on monday when the tech guy is in.
Does this inverter takes in three phases from 3 different arrays then has 3 ac phases coming out of it? So I take it I would be using a 3 phase meter.
So if all my phases don't go above 16a and the arrays don't generate more than 3.6 kw each, does it mean would accept a normal G83 application.
Thanks again.

 

[SourceSolar]

Hey there Nicky
For an installation to connect under G83 it must be below 16a per single phase so three phases 48 A 48* 230= 11300 W or 11.3 kWp happy days here is link to the data sheets for this inverter I apologise if I'm not supposed to make links to products or companies on this forum. I don't work for SMA by the way just think you could lower your costs, time installing and hassle by using one inverter.
http://www.sma-iberica.com/en/products/solar-inverters/sunny-tripower.htm

 

[SourceSolar]

Sorry bit sloppy on first post "no need to notify dno." need to notify just not in advance as only one inverter or SSEG as the DNO likes to call them. Always worth a quick call just to see if the network is up to it though. Although the bloke in my neck of the woods said it sounded like i knew more about it than he did

.

 

[Nickyrox]

Hi Mark,
when you said you used a small 3 phase board do you mean a four way one or is there a smaller sort?
Did you site this additional board next to the existing one?
I take it you wired the new board to a tripple pole isolator in the existing one.
Cheers for your help
Nick

 

[Nickyrox]

Sourcesolar,
I spoke to the supplier in this country for SMA Inverters,and tried to order a tripower version but he told me he could get hold of one but said they hadn't been approved in this country yet. I have ordered 3x inverters instead now.
Just tying to get all sorted out for the job because time is ticking.

 

[TedM]

All 4 models in the SMA Tripower range have G83 certification:

17000TL-10, 15000TL-10, 12000TL-10, 10000TL-10

http://download.sma.de/smaprosa/dateien/1807/G83-1-1_STP10-17TL-10-ZEN104711.pdf

 

[Markc]

Hi Mark,
when you said you used a small 3 phase board do you mean a four way one or is there a smaller sort?
Did you site this additional board next to the existing one?
I take it you wired the new board to a tripple pole isolator in the existing one.
Cheers for your help
Nick

Yes four way board, yes next to existing main DB and yes connected via one TP MCB @ 63A. (only to allow use of remaining spare ways of DB we fitted.

 

[Jeffmo65]

If I have a 3 phase inverter fed from a 3 phase mccb and a 1phase inverter fed from a single way in a 1 phase cu , how would i connect the meters . L1 from inverter 3 ph to supply side of L1 meter , L2 to supply side of L2 meter , L3 to supply side of L3 meter . now can I connect L1 from single phase inverter to supply side of previous L1 meter . This may sound strange question but just a bit worried about possible backfeeding issue or cut out fuses blowing . Presumably i can link all neutrals together as they are common via isolators . To be honest i worry about the neutral issue moreso , and need my pesimistic think before act brain putting at ease

 

[Jeffmo65]

By the way the inverters are fronius ig plus 150 and fronius ( single phase )IG plus 100

 

[Cider]

Presuming they are seperate installations even if at the same property they will need seperate meters and seperate notification to dno.

 

[Jeffmo65]

Hi there , yes i understand about DNO and all that but this is 1 customer install just 2 inverters 1x single and 1x 3 phase thanks but my question was hoping for a little more technical feedback thanks

 

[Jeffmo65]

surely someone has come across this before and could enliten me a little further. A post script to this seperate note if you have 2 inverters as my previous or single phgase single phase , 3 phase 3 phase would they be able to sync propoerly if on same meters . Presumably you can switch them at leasure or is it like a 2 key nuclear missile that you have to switch at exact same time . cheers Solar heads . HELP

 

[SourceSolar]

Why must you use a 3ph and and single phase inverter on the same installation why not one larger 3ph unit?

 

[Earthstore]

If you install on a 3 phase supply, let's say a farm, you would have one meter and one Mpan number, hence one generation meter.
However, as you system is domestic, at a guess, the phase's would be split over different properties, therefore, three separate incoming meters and 3 MPAN numbers, so it would require 3 generation meters, the downside of that would be the properties where the meters are would have the gain of the electricity, and not the landlord, he could still claim the FIT and export though if your system sized was calculated correctly.
Adding another system on a separate inverter makes things rather complicated, it depends how the 3 phase system is connected in as above,
Does the landlord really need all this power? Or will most of it be exported anyway? Will he be fitting an Export meter? What size are the systems planned to be?
Remember, the DNO like to balance load and supply equally over 3 phases, as this is how their transformers work best back at the sub stations.
Hope this helps