ratcheting cyclometers [RE-wrenches]

[Kirk Herander, VSE]

Hi Doug,

Are you saying that this should work with both a "standard" (non-detent) and
a ratcheted (detent) meter, or just a ratcheted version? I presume its only
the ratcheted version.

And if there is a power failure and no sun, the battery kwh to the critical
loads will be measured on the meter, inflating pure solar KWH measured,
correct?

Kirk

> -----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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