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

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andyp asked Mar 10, '24

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.

Energy Meter

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Answer 1 · 2024-03-10T15:52:16Z

ejrossouw answered · Mar 10 at 03:52 PM

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

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Answer 2 · 2024-03-10T15:56:08Z

andyp answered · Mar 10 at 03:56 PM

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

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Answer 3 · 2024-03-10T16:07:31Z

andyp answered · Mar 10 at 04:07 PM

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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