Incentives Program Monitoring Question [RE-wrenches]

[Matt Tritt]

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  Right. How could efficiency possibly be measured and compensated 
monitarily in an off-grid, battery-based system? The only reasonable method 
has to be an up front payback for a percentage of total installation costs 
and/or for actual kWh consumed, not generated by the energy source.

  Matt T
  ----- Original Message ----- 
  From: "Bob-O Schultze, Electron Connection" <econnect at snowcrest.net>
  To: <RE-wrenches at topica.com>
  Sent: Wednesday, November 10, 2004 11:48 AM
  Subject: Re: Incentives Program Monitoring Question [RE-wrenches]




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  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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