<font size=2 face="sans-serif">Hi:</font>
<br>
<br><font size=2 face="sans-serif">We haven't changed anything the in C40.
The essence of my idea was that perhaps the "trouble" systems
are the ones which have much higher module Voc versus battery Vfloat.</font>
<br>
<br><font size=2 face="sans-serif">JARMO<br>
</font><font size=3 color=#008000>_____________________________________________________________________________________</font><font size=3>
<br>
</font><font size=1 face="Arial"><b><br>
Jarmo Venalainen</b> | </font><font size=1 color=#008000 face="Arial"><b>
Schneider Electric </b></font><font size=1 face="Arial"><b> | Xantrex
Brand</b> | <b>CANADA</b> | <b>Sales Application
Engineer</b> <b><br>
Phone:</b> +604-422-2528 | <b>Tech Support:</b> 800-670-0707
| <b>Mobile:</b> +604-505-0291 <b><br>
Email:</b> </font><a href="mailto:jarmo.venalainen@schneider-electric.com"><font size=1 color=blue face="Arial"><u>jarmo.venalainen@schneider-electric.com</u></font></a><font size=1 face="Arial">
| <b>Site:</b></font><a href=http://www.xantrex.com/ target=_blank><font size=1 color=blue face="Arial"><u>
www.Xantrex.com</u></font></a><font size=1 face="Arial"> |
<b>Address:</b> 3700 Gilmore Way, Burnaby, BC V5G4M1 <br>
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<td><font size=1 color=#5f5f5f face="sans-serif">From:</font>
<td><font size=1 face="sans-serif">Ray Walters <ray@solarray.com></font>
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<td><font size=1 color=#5f5f5f face="sans-serif">To:</font>
<td><font size=1 face="sans-serif">RE-wrenches <re-wrenches@lists.re-wrenches.org>,
</font>
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<td><font size=1 color=#5f5f5f face="sans-serif">Date:</font>
<td><font size=1 face="sans-serif">05/19/2015 11:00 AM</font>
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<td><font size=1 color=#5f5f5f face="sans-serif">Subject:</font>
<td><font size=1 face="sans-serif">Re: [RE-wrenches] Fw: Xantrex
C-40 Drifting</font>
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<td><font size=1 color=#5f5f5f face="sans-serif">Sent by:</font>
<td><font size=1 face="sans-serif">"RE-wrenches" <re-wrenches-bounces@lists.re-wrenches.org></font></table>
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<hr noshade>
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<br>
<br><font size=3>Hi Jarmo;<br>
<br>
Early solar systems actually tried to use the principle of matching array
Vmpp to battery voltage in lieu of charge controllers. The
biggest issue is that when it is is hot the module voltage can drop below
the battery voltage needed, and when its cold the voltage will still be
too high. Batteries were either over charged or never reached
full charge depending on the conditions.<br>
I've used the C40 successfully for decades, so I'm wondering if the circuitry
changed recently, or if different tolerance components were substituted
that may be causing the drift?<br>
<br>
Thanks,</font>
<br><tt><font size=3>R.Ray Walters<br>
CTO, Solarray, Inc<br>
Nabcep Certified PV Installer, <br>
Licensed Master Electrician<br>
Solar Design Engineer<br>
303 505-8760</font></tt>
<br><font size=3>On 5/19/2015 10:31 AM, </font><a href="mailto:Jarmo.Venalainen@schneider-electric.com"><font size=3 color=blue><u>Jarmo.Venalainen@schneider-electric.com</u></font></a><font size=3>
wrote:</font>
<br><font size=2 face="sans-serif">Hi:</font><font size=3> <br>
</font><font size=2 face="sans-serif"><br>
I didn't know that there were systems out there where a PWM charge controller
such as the C-40 was producing an unhealthy, high battery voltage. Since
there are, I may have a possible explanation.</font><font size=3> <br>
</font><font size=2 face="sans-serif"><br>
The C-series and other PWM type charge controllers operate by PWM whereby
they very very quickly connect/disconnect the solar module to the battery
bank. The amount of time which the module is connected to the array
is the PWM on-period. These controllers do not have the ability to
"smooth out" the output voltage. All they can do is apply
the full module voltage OR not a</font>
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