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.venalai...@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 <r...@solarray.com> To: RE-wrenches <re-wrenches@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-boun...@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.venalai...@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 ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. ______________________________________________________________________ _______________________________________________ List sponsored by Redwood Alliance List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
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