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B

Berneray

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Evening guys......

Dies any one know if we need DNO approval or a site inspection for a 12kwp system on a house with a three phase supply...I don't know if its an urban legend or not but someone told me you don't...

Any adviced greatly accepted...

thanks
 
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S

screwdriver

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  • #2
Depends on the DNO and inverter choice, if you are fitting 3 16amp capped singlephase g83 inverters then no you don't. if you fit a three phase inverter then you need to prove it is unable to output more than 16amps per phase and is also G83 type tested. Which may mean installing less panels!!

If you are unable to meet these requirements then you need to apply for G59/2 approval with the local DNO, of which some will wish to witness and some won't. If they have witnessed any of your work before then you may be fine without a site visit although you will need to send in proof of inverter settings after the system has been commissioned. UKPN don't currently ask for witness testing on the smaller systems in our experience.

Hope that makes sense!
 
S

sedgy34

  • Thread Starter Thread Starter
  • #3
Speak to your DNO they will advise on there network at the property get your customers mpan number too
 
E

Earthstore

  • Thread Starter Thread Starter
  • #4
You should be able to do this under G83 if it is split over the 3 phases, and no more than 16A /3.68KW per phase.
Why install 12KW? If you stay below 10, the customer would be on a higher FIT rate.
I have heard of people claiming 3x4kwp FIT payment although I am not convinced that this is correct.
 
You should be able to do this under G83 if it is split over the 3 phases, and no more than 16A /3.68KW per phase.
Why install 12KW? If you stay below 10, the customer would be on a higher FIT rate.
I have heard of people claiming 3x4kwp FIT payment although I am not convinced that this is correct.
I'm sure that can't be right if there is only 1 MPAN/supply as this is what the FIT is paid on, not the phases.
 
B

Berneray

  • Thread Starter Thread Starter
  • #6
Thanks for the info guys.....we need to install a 12kwp to get to Band D......its a 300 year old mansion with single glazed windows and an old oil fired boiler....the panels are going on a stable roof.

Spoke to DNO who were really helpful. We can have an 11kwp system (3 times 3.61kwp) and still use a G83 application. Any higher need a G59. JUst need to see if a 11kwp working for Band D.

They told us we can go ahead and install then submit the G83 after testing. Have I picked them up right....

Any info is greatly appreciated.
 

Worcester

-
Mentor
Arms
at 11kWp post install would be for 3 phase, if it isn't then you will need DNO approval to connect anything > 3.68kWp (3.68x3 = 11.04 ~ 11kW)

So reading your OP, which says three pahse, that's why you are OK.
 
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