Solar Boost in Net Metering [RE-wrenches]

[Travis Creswell, Ozark Solar]

Jon,

That's a good point about the batteries being full reducing the benefit of
MPPT in net metering.  Here is an interesting idea.  What about using eleven
2 volt cells in a 24 volt system?  This would bring the system voltage down
increasing the benefits of MPPT.  You could adjust the set points on the SW
to compensate for the missing 2 volts and still have batteries fully charged
waiting for a power outage.  I didn't think it out much, but I you still get
the idea.

I'd like to set up a something on my array side (vs. the common - of the
system) and use it to count the array's amp hour production.  A Tri-Metric
or similar would be nice and I believe it would be more accurate than the
C40 DVM and for the most part, pretty inexpensive.  What would really be
nice would be something that would take voltage into account and give daily
watt hours.  Yes, you could do this with a data logger but it will require
combining two channels and would a lot more expensive than a customer would
want to pay.  It seems that this would be a great product in this day of net
metering systems gaining popularity.

Thanks
Travis  
----------
>From: "Jeffrey Wolfe, Global Resources" <global at sover.net>
>To: "'RE-wrenches at topica.com'" <RE-wrenches at topica.com>
>Subject: RE: Solar Boost in Net Metering [RE-wrenches]
>Date: Tue, Aug 15, 2000, 9:28 PM
>

>Jon,
>
>Both the Solar Boost that we use on our mobile setup and the Fire Wind and 
>Rain that we are destroying in our basement are hooked up to net meter. The 
>only tricky part is just like on the C-40's or others. Make sure the 
>controller does not go into shutoff due to voltage. I was told by Trace to 
>keep the voltage differential (between the Inverter and the charge 
>controller) at .5V for 12V system, 1V for a 24V system and 1.5V for a 48 V 
>system, due to "measurement errors" (i.e. to make up for Trace's bad 
>meters).
>
>The power boost and the voltage conversion have nothing to do with the net 
>metering otherwise. Of course, we do not see the larger boost, since we are 
>operating at "battery full" levels, but we are still seeing an 
>(unscientifically measured) approximately 10 - 15% boost with the SB50. (No 
>boost, probably deficiet, with the FWR)
>
>Jeff
>
>Jeffery D. Wolfe, P.E.
>Global Resource Options, LLP
>A Woman-Owned Vermont Limited Liability Partnership
>4 Kibling Hill Road
>P.O. Box 51
>Strafford, VT 05072
>802/765-4632
>802/765-9983 (Fax)
>global at sover.net
>www.globalresourceoptions.com

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