Re: Watt Meter to consumer board?

[Jerry Avins <jya@xxxxxxxx>]

Declan McEvoy wrote:
> Here's a very interesting product capable of data logging and 220 VAC @50 hz
> and is cheap too. However it seems like it is designed to monitor one
> appliance only rather than Whole House.
>
> https://www.doubleed.com/secure.html

I wouldn't advocate using it with a shunt, but it ought to be easy
enough to add a current transformer. To wind your own, determine the
needed full-scale secondary voltage -- it will be millivolts at most --
and figure .25V/turn/in^2 of core. Make the turns ratio whatever you
need. You can assemble the core around the mains conductor is a single
primary turn will do (and it should).

Jerry
--
Engineering is the art of making what you want from things you can get.
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