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16mm tails 100A fuse - EV & ESS

vantech

Hi all,

Just looking for a quick sense check.

I currently have job with a 100A DNO fuse with 25mm meter tails feeding the main consumer unit. I’m planning to install an additional external consumer unit via a Henley block to supply:

  • 7kW EV charger
  • 5kW battery storage system (charging) plus 5kW backup circuit (discharge capability) - total 10kW. 

Due to routing constraints, installing 25mm tails to the external CU will be very difficult, so I’m considering using 16mm² tails instead.

The maximum potential simultaneous load on these tails would be approximately 74A (5kW charge + 5kW discharge + 7kW EV). The EV has a 60A load curtailment so the maximum is likely never going to be this high, and the backup circuit on the ESS is supplying sockets (excluding kitchen) and lights, so unlikely ever going to be more than 2-3kW. 

Given that the load is effectively limited by the connected equipment, would 16mm² tails be acceptable on a 100A supply in this scenario, or would 25mm tails be required?

Appreciate any guidance or references to regs / best practice.

Thanks.

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  • 0

    Further thoughts

    Most people with house batteries and ev charger want to avoid the car discharging the batteries, how will this be achieved. Probably a bit easier with ac coupled battery and the right ev charger.

  • 0 in reply to Alan B

    Hi, 

    The EV can charge basis off peak tariffs (cheaper rates) as can the ESS (eg Octopus have API support). You can also discharge from the ESS into the EV by setting the max charge demand on some EVs to match the output of the ESS (to prevent grid pull). 

    It’s all very configurable. 

  • 0 in reply to vantech

    Yes all very configurable, difficult to get operating correctly especially if Octopus intelligent go is involved and there are charging slots when the battery is charging the house.

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