The modules are Sunwise 22 V, 40 W modules. The model number of the
modules is SW-S40P SWT. The are wired in series for a 24 V nominal
system. That would be an mppt voltage of 44 V on a system that
directs batteries to absorb at 29.4 volts. I'm not sure what the NOCT
voltage would be, but it would seem like it would be an ok fit?
I think you are on the right track with the MPPT charging graph. The
CC likely allows pulses of full charge to hit when the batteries are
at their maximum set point voltage.
Would a very short pulse of high voltage be a problem of a VRLA
battery? Could any significant gassing take place?
Thanks,
Drake
At 06:04 PM 5/19/2015, you wrote:
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
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Jarmo Venalainen | Schneider Electric | Xantrex
Brand | CANADA | Sales Application Engineer
Phone: +604-422-2528 | Tech Support: 800-670-0707 | Mobile:
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Email:
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| Site: www.Xantrex.com | Address: 3700 Gilmore Way, Burnaby, BC V5G4M1
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*** 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,
<mailto:jarmo.venalai...@schneider-electric.com>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
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