Re: OT kw/h meter....in line?

Posted by Andy Martin on November 18, 2004 at 15:42:26 from (64.219.39.195):

In Reply to: OT kw/h meter....in line? posted by ButchWI on November 18, 2004 at 15:20:01:

Best thing I can come up with is one of the sensors used in woodworking to turn on your dust collection system when you start a saw. It is basically a relay that you plug the saw into, when you turn the saw on the current flow ot the saw energizes the relay and that switch is used to start a vacuum. Instead of starting a vacuum, you plug an old 110v clock into it and in the morning you can tell how many hours the heater has been on overnight. KWH computation is elementary from there, ignoring inrush current into the heater you'd be close.

I've been wondering how to do this for years to monitor stock tank heaters. An inline ammeter which will also record KWH is about $1,500 and I don't want to kmow that bad.

With your question, I called an EE and we figured this method out. I think the vacuum triggers are $15 or so. You are supposed to plug each tool in you rshop into one and whichever tool gets energized starts the vacuum.

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