[RE-wrenches] Morningstar PWM
Drake
drake.chamberlin at redwoodalliance.org
Fri Sep 11 08:41:20 PDT 2015
The batteries are good. We are going to try some
custom settings. This CC works a bit differently
than most, and the problem may be in the duty
cycle, IE, how much time the pulses are on vs off.
At 04:36 PM 9/10/2015, you wrote:
>Drake,
>
>Quote: â...and goes right back to that voltage in the morning.â
>
>How quickly does the battery voltage rise to
>29.1 in the morning? If the batteries are
>sulfated heavily, you may see a very fast rise
>in voltage but you will also see a loss of
>capacity. Batteries in the early stage of
>sulfation may have a difficult time reaching the
>constant voltage setpoint and remain in bulk charge continuously.
>
>What is the size of the PV array and battery
>bank? If the array is too small for the bank,
>this is the time of year (less sun hours per
>day) that we start to receive complaints about
>the battery not getting charged.
>
>Larry Crutcher
>Starlight Solar Power Systems
>
>On Sep 9, 2015, at 5:06 PM, Drake
><<mailto:drake.chamberlin at redwoodalliance.org>drake.chamberlin at redwoodalliance.org>
>wrote:
>
>Hello Wrenches,
>
>I have a Morningstar PWM 45 that doesn't drop
>out of absorb. It is set with dip switches to
>absorb at 29.2 V and stays constant around 29.1.
>It has stayed at 29.1 for several hours
>straight, and goes right back to that voltage in
>the morning. Tech support says the controller is
>working correctly. Have any of you seen this, or
>conversely have you seen the Morningstar drop
>into float after a reasonable amount of time?
>
>Thanks,
>
>Drake
>
>
>Drake Chamberlin
>Athens Electric LLC
>OH License 44810
>CO License 3773
>NABCEP Certified Solar PV
>740-448-7328
><http://athens-electric.com/>http://athens-electric.com/
>
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