[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: “...and goes right back to that voltage in the morning.”
>
>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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