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

[Joel Davidson]

I use these initial settings to get systems with sealed batteries up and
running:
C40 Bulk 57
C40 Float 56
SW Bulk 56
SW Float 54
I don't bother with tenths of volts any more because meter tolerances are
plus/minus 2% to 5%. I usually have to fine tune the C40 Float. I had to
change my C40 Float setting to 57 volts after 4 years to get my system to
act like it did when the setting was 56 volts. In 1998, I started with 0.4
volt difference between C40 and SW float. A few years ago, I changed to 0.8
volt difference. Now, less than 1 volt difference does not give current a
good "downhill" flow from the PV array through the C40 and SW and into the
grid. A good rule of thumb is to set the Float difference as wide as
possible to avoid costly call-backs. Also offer customers an service call
option to perform annual field maintenance. (Do any former GIs remember
FITCAL?)

Graham Owen wrote:

> Dear Colleagues,
>
> I need some Wrench assistance with a PV service call, for the Xantrex
> Power Module system (or power panel for that matter), you have to set
> the C40 charge controllers and the SW inverter so that the inverter can
> sell PV power to the grid without the controllers restricting current
> into the inverter in the first place. I am trying to determine which set
> of values works the best.
>
> Are these good figures?
>
> C40  bulk   56.0
>      float   55.0
>
> inverter bulk  54.0
>        float   53.2
>
> Thanks in advance!
>
> Graham
>
> P.S. Joel, I am working on finding your CPUC answers, I was working out
> of town today.
>
> - - - -
> To send a message: RE-wrenches at topica.com
>
> Archive of previous messages: http://www.topica.com/lists/RE-wrenches/
>
> List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm
>
> Check out participant bios: www.mrsharkey.com/wrenches/index.html
>
> Hosted by Home Power magazine
>
> Moderator: michael.welch at homepower.com
>

- - - -
To send a message: RE-wrenches at topica.com

Archive of previous messages: http://www.topica.com/lists/RE-wrenches/

List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm

Check out participant bios: www.mrsharkey.com/wrenches/index.html

Hosted by Home Power magazine

Moderator: michael.welch at homepower.com

==^================================================================
This email was sent to: michael_welch at sbcglobal.net

EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9.bWljaGFl
Or send an email to: RE-wrenches-unsubscribe at topica.com

TOPICA - Start your own email discussion group. FREE!
http://www.topica.com/partner/tag02/create/index2.html
==^================================================================