ratcheting cyclometers [RE-wrenches]

[Doug Pratt]

-----Original Message-----
From: Kelly Keilwitz [mailto:kelly at whidbeysunwind.com] 

<snip>
But, is it possible to distinguish between grid feed and PV feed to the
subpanel? <snip>


Simple. Using a standard 240v utility meter, wire the 120v leg from the
SW output to the subpanel so that power passing to the subpanel spins
the meter forward. Wire the other 120v leg so that power passing from
the main panel to the SW input spins the meter backwards. 

If the SW is simply passing utility power straight thru to the subpanel,
you'll have no meter action. The two currents cancel each other out. If
the SW is pushing solar power to the subpanel, the meter spins forward.
If the SW is pushing solar power to the subpanel *and* the utility, the
meter spins forward faster. 

This ought to still work just fine with a ratcheted meter so that night
time battery charging isn't deducted. 

*Caution*, I must admit I haven't DONE this, but I can't see any problem
with it. We run meters forward and backward like this all the time. If
I'm missing something obvious, I'm sure we'll all hear about it. :-)

Cheers,
Doug Pratt

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