question

andyp avatar image
andyp asked

vm-3p75ct on 100A Grid Supply when charging. Will it work?

Hi, I'm looking at changing my ET112 for a vm-3p75ct. It's an ESS setup with 2 MPIIs in parallel.


I have a 100A grid supply. Most of the time the batteries are supplying energy so the vm-3p75ct would be measuring near 0A. So all would be good.


However, I have a 4 hour cheap rate energy window at night and regularly pull near 100A. This is with 2 EV chargers, ESS battery charging, washing machine, tumble dryer and dish washer. The EV chargers have load limiting so they throttle back to not exceed 100A.


So will the vm-3p75ct just report 75A to the Cerbo but just work? It will only be charging at this time in Winter or charging with a low SoC limit in summer so it won't be trying to control the grid power in or out.

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3 Answers
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ejrossouw answered ·

@andyp No. Current rating aside the clamp will not fit over a 25mm2 incoming tail.

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andyp answered ·

Thanks for the answer. That's a show stopper straight away!



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andyp answered ·

In case it helps anyone else, I've just measured my 25mm2 tails and they are 11.1mm.


The CT is a Kemet C/CT-0810 which has an ID of 10mm.



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