C40's and SW's [RE-wrenches]

[Bill Brooks]

Eric,

I believe several of the posts mentioned that sell voltage must be lower
than the charge controller float and bulk voltages to work properly.

Something that has not been mentioned that you point out here is that if you
are using the Grid Usage Timer to sell power, the sell voltage is not
temperature compensated--it is a constant.

However, if you are in sell mode with the Grid Usage Timer turned off (start
and stop times identical), then the SW will go to float charge setting and
remain there--this is a temperature compensated setting.

So to sum up:

1. Turn Grid Usage Timer Off (that is default)
2. Turn Bulk Charge Timer to 0:00 (default is 2:00)
3. Leave Float voltage setting at the default of 53.6 Volts
4. Set your backup charge controller to at least 1 Volt higher (54.6V)
   (and confirm that the setting is accurate)
5. Make sure all equipment has temperature compensation probes and the are
attached to the battery such that they are reading as close to the same
temperature as possible.

Bill.

-----Original Message-----
From: Eric Smiley [mailto:Eric_Smiley at bcit.ca]
Sent: Wednesday, February 05, 2003 3:29 PM
To: RE-wrenches at topica.com
Subject: RE: C40's and SW's [RE-wrenches]



I didn't see any mention of the SW Sell Voltage in the posts, which has
to be less than the C40 bulk and float voltages, but greater than the SW
float voltage.

However, (I believe it was Bill that pointed this out to me) the Sell
Voltage is not temperature compensated.

Eric Smiley
Project Leader
Photovoltaic Energy Applied Research, Technology Centre
British Columbia Institute of Technology
Burnaby Campus

NE25 - 3700 Willingdon Avenue
Burnaby, British Columbia
Canada V5G 3H2

phone: 604.432.8657    fax: 604.436.0286
esmiley at bcit.ca             www.tc.bcit.ca

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