[RE-wrenches] Morningstar PWM

[Starlight Solar Power Systems]

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 <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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