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

[sunwise]

Hey Graham,

Those numbers will certainly work.  I usually like upping the bulk but
leaving the floats lower (where you have them is fine IMHO).  The C40
should only be regulating during power outages and the Trace should only
bulk following such an event, and it is usually good to hit some higher
voltages if the battery saw some discharged during an outage.

If you are in a cold environment, make sure both the CC and the inverter
are temperature compensated and if no TC on the CC, then none of the
Trace (and keep the battery temp constant?).  I'd raise the bulks to 60
for the CC and 59 for the Trace, leaving the floats where you have them.
You'd want to lower this if you have frequent shorter power outages.  If
power outages are rare, I tell my clients with Grid-tied SWs to
occasionally cycle power on AC1 to deliberately initiate a bulk charge
from the Trace, although I usually lower the absorption to one hour from
the default of two.

I'd be interested in hearing other thoughts on this subject, and what
about the settings for similar systems with MPPT CCs?  What's the best
settings to maximize PPT?

Kurt Nelson
SOLutions

-----Original Message-----
From: Graham Owen [mailto:graham at solarexpert.com] 
Sent: Monday, February 03, 2003 11:01 PM
To: RE-wrenches at topica.com
Subject: C40's and SW's [RE-wrenches]

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.

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