Do Canceling Meter Legs Work? (Was Re: ratcheting cyclometers) [RE-wrenches]
Christopher Freitas --- OutBack Power
cfreitas at outbackpower.com
Tue Jan 20 12:58:07 PST 2004
This trick of using a 240 VAC meter for a 120 VAC system with the input
and output flowing through the two legs in opposite directions does work
- I did it years ago on some of the first grid-tie SW systems - but I
remember using the type of meters which included a neutral tap - which
must have been the "5 jaw" type. I think there might be a way to wire
into the little 120/240 jumper on the back of the regular 4 wire type
meters - but I am not sure...
You also can do this trick with a current sense transformer as well by
passing both input and output conductors through the same "hole" in
opposite directions. So using a meter with a seperate CT would be
another option.
Basically - a mechanical kwh meter is an analog multiplier. Think of it
as having a tiny motor which spins based on voltage applied and the
amount of current flowing through the meter. There is actually a slight
error when spinning the meter backwards as the drag of the bearing is
calibrated out in the normal direction - so the KWH meters read slightly
low when selling power back to the utility - figures!
Christopher Freitas
OutBack Power Systems, Inc.
cfreitas @ outbackpower.com
www.outbackpower.com
Arlington WA USA
Tel 360 435 6030
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