They suggested e bay!!
Or one of these. Mount it in a spare way if you have a consumer unit.
They are what is inside a "Metermaid". Nothing else!
Use one of these, a blanking strip to make it one way and a couple of glands, make your own, if the marina wants it outside the boat
Before fitting one of the alternative DIY meter solutions, check with the marina. Our marina will only permit metered electricity using the Metermaid devices. Previously allowed one alternative but after some reports (elsewhere) of failures which “could cause a fire”, now it is Metermaid or pay daily fee.
And they don't want to specify the type, install it, and verify function? Certainly they don't want slip owners messing with 240V wiring.
All a bit vague, is this a knee jerk reaction or ulterior motive on the part of the marina. Whilst I fully appreciate the concerns associated with DIY units, of any description, I would suggest that any any safety concerns cannot be resolved just by insisting on unit XXXX. I have, not so long ago, tested two Metermaid units which were positively lethal with ingress of moisture, lack of earth continuity and evidence of overheating both in the plugs/sockets and internally in the units when they were cut open after being condemned. If the marina wants to invoke H&S then they could place the onus on the berth holder to provide prove of compliance. i.e. PAT test. Or provide on site permanent metering, see below.
I am not claiming to be a technical expert. Just pointed out need to speak to marina before buying/making an alternative solution as some/many marinas do not permit alternatives. If an electrical expert you could try negotiating with them - good luck.
