Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Replies 4 replies
  • Subscribers 34 subscribers
  • Views 807 views
  • Users 0 members are here
Options
You may also be interested in

EICR Coding of PV & EESS Poor Practice

Chriso

Evening all,

First time I've posted in a long time, first time on this new set up.

Did an EICR today that took in a small outbuilding with an old FIT PV system installed.  Since this installation another company has added a second inverter and a battery.

The outbuilding is supplied with a 2.5 SWA to a garage style distribution board with a 40A 30mA RCD main switch (AC type), personally think the sub main to this building should have been upgraded prior to the initial solar being installed.

The new inverter and battery is fed directly from the original system rotary isolator (via another isolator).  This is all supplied via a B16 MCB.  The PV inverter is rated at 4kW and the battery inverter is 3kW.

My thoughts are that obviously each inverter should be on it's own circuit, there is also the issue of the new inverter and battery now being connected to the FIT export meter.  But for me the big one is if the battery is full and the PV is in optimum conditions you could have a overload situation. There is the B16 MCB to potentially limit this and there apparently haven't been any incidences of nuisance tripping.

C2 or C3, what does everyone think?

Chriso 

Parents
  • 0

    Thanks for the responses, apologies for my delayed reply.

    I take the point about the distribution board and the rating of the RCD main switch, but with the B16 MCB in place I guess that should limit the loading.

    Battery has it's own independent inverter so I suspect it can charge from the grid as well as using any spare PV generation.  Being wired in with the initial solar installation I think you could in theory charge the battery from the grid and then resell at a later date running through the FIT generation meter, so I think there is potential for fraudulent use.

    The inverters appear to be working independently of each other, that's what made me think there was the possibility of overload in the right circumstances.

    It's obvious this hasn't been done diligently but I'm conscious of wording this appropriately on my report, I know the customer is going to challenge the company who installed the battery.  I think this company should have directed the customer to replacing the submain to the outbuilding and installing a new distribution board to allow for a new circuit for the battery.  

Reply
  • 0

    Thanks for the responses, apologies for my delayed reply.

    I take the point about the distribution board and the rating of the RCD main switch, but with the B16 MCB in place I guess that should limit the loading.

    Battery has it's own independent inverter so I suspect it can charge from the grid as well as using any spare PV generation.  Being wired in with the initial solar installation I think you could in theory charge the battery from the grid and then resell at a later date running through the FIT generation meter, so I think there is potential for fraudulent use.

    The inverters appear to be working independently of each other, that's what made me think there was the possibility of overload in the right circumstances.

    It's obvious this hasn't been done diligently but I'm conscious of wording this appropriately on my report, I know the customer is going to challenge the company who installed the battery.  I think this company should have directed the customer to replacing the submain to the outbuilding and installing a new distribution board to allow for a new circuit for the battery.  

Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines