[RE-wrenches] Fw: Xantrex C-40 Drifting

Tue May 19 15:04:10 PDT 2015

Hi:

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.

JARMO
_____________________________________________________________________________________ 

Jarmo Venalainen  |   Schneider Electric   |  Xantrex Brand  |   CANADA  | 
  Sales Application Engineer 
Phone: +604-422-2528  |   Tech Support: 800-670-0707  |   Mobile: 
+604-505-0291 
Email: jarmo.venalainen at schneider-electric.com  |   Site: www.Xantrex.com 
|   Address: 3700 Gilmore Way, Burnaby, BC V5G4M1 

*** Please consider the environment before printing this e-mail

From:
Ray Walters <ray at solarray.com>
To:
RE-wrenches <re-wrenches at lists.re-wrenches.org>, 
Date:
05/19/2015 11:00 AM
Subject:
Re: [RE-wrenches] Fw:  Xantrex C-40 Drifting
Sent by:
"RE-wrenches" <re-wrenches-bounces at lists.re-wrenches.org>

Hi Jarmo;

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.
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?

Thanks,
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer, 
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 5/19/2015 10:31 AM, Jarmo.Venalainen at schneider-electric.com wrote:
Hi: 

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. 

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

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