Incentives Program Monitoring Question [RE-wrenches]

[Kelly Keilwitz]

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Bob-O & Allen,

Currently, our grid-tied, battery-based customers who are selling their
green-tags (for OR & WA) monitor AC output (performance) with KWH meters.
Production to back-up loads and the main panel (grid) is logged. Grid energy
to charge the batteries is subtracted. Why can't these be used?

Also, I'd like to hear from Outback on the progress of their "smart shunt"
and if it could work for battery-based performance.

> Allan,
> How can performance be monitored for battery-based grid-tied systems?
>
> >How can performance be monitored for off-grid systems?
>
> Assuming that you want to pay a production incentive for both power
> sold back AND that consumed in the home, it's a bit of a nightmare.
> For the grid-tie, a detented analog or two register digital KW/H
> meter on the input/sell back wire(s) will eliminate recording of
> power bought from the grid and a second analog or single register
> meter on the inverter output to the loads read in conjunction with
> your "regular" utility meter should do it, ASSUMING that the whole
> house is sourced from the inverters. That is mostly not the case, as
> you know.
> For offgrid, I haven't got a clue. About the only way I can think of
> to do both would be by recording DC KW/H from the array and taking
> your best shot at guesstimating efficiency. 75% would be a good
> starting point, I think, given that array losses should be already
> accounted for.
> It's a booger anyway you look at it and "familiar to existing utility
> structures" is pretty much out the window.
> Good Luck!
> Bob-O
>
> >
> >Both types of systems, as well as batteryless grid-tied systems, are
> >expected to be included in the structure of the incentive package. It
will
> >probably be the utilities who will fund the incentive (although this has
yet
> >to be worked out) in return for allowing them to claim the Renewable
Energy
> >Credits of participating customer-owned RE systems toward the
state-mandated
> >Renewable Portfolio Standard. As such, any monitoring equipment and
methods
> >should be as familiar to existing utility structures as possible.
>
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