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
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