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Re:No, you can’t save £30 per year by switching off your “st... by roter on Wednesday April 27, 2022 @09:31AM (#31179607)
How much is the draw of all those ammeters? i.e. the "burden". I'm having trouble finding what that would be for a typical household plug ammeter without avoiding all the "power meters are great" spam sites. I assume it is very small.
Re:No, you can’t save £30 per year by switching off your “st... by vetinari on Wednesday April 27, 2022 @09:50AM (#31179874)
I'm using Shelly EM at the entry (for the entire phase), relays with PM at some sockets with interesting devices and shelly plugs at some sockets that need to be easily serviceable (think behind kitchen cabinets, for the built-ins).

The consumption of each of them is below 1W.

Re:No, you can’t save £30 per year by switching off your “st... by xyzzy123 on Wednesday April 27, 2022 @10:54AM (#31180652)
Nobody is missing 50w any more because that goes on their BOM as a bigger power brick. I can see this stuff where someone missed an incandescent or hasn't replaced a device in 10 years but really stuff has moved on and cost optimisation is relentless.
Re:No, you can’t save £30 per year by switching off your “st... by disiplus on Wednesday April 27, 2022 @09:50AM (#31179869)
i had access to industrial power meters designed to 120A 400V so that is what i used, but the typical household here would not go over 4-7 kw and you can buy cheap digital meters from AliExpress with display and so on they can measure up to 4kw i believe.