Blue Sky Sun Charger 30 bulk mode charging voltage

1 Posts
May 5, 2015 10:05 pm
Blue Sky Sun Charger 30 bulk mode charging voltage

Hi all,

I recently installed a small solar system in my RV consisting of a 105W solar panel mounted on the roof, a Blue Sky Sun Charger 30 controller with remote temperature sensing and two 6v golf cart batteries connected in series. The display on the controller showed a voltage of 12.2v. Both LEDs were on, indicating bulk charging mode as I would have expected given the voltage. Even with the unobstructive sun high in the sky, the display never went higher than 12.5v and 0.5 amps. Is that normal? I would expect to see a charging voltage around 14v in those conditions. If that's not right, where can I start looking to troubleshoot the issue? I measured the panel at about 20v open circuit.

47 Posts
May 7, 2015 04:51 pm
Re: Blue Sky Sun Charger 30 bulk mode charging voltage

Brad, I'm curious how low the voltage on the battery bank was without the charge controller on it.  Since it is a PWM charge controller, it basically opens the connection from the panel to the battery.  If the battery voltage was very low, it will pull the output down as it is charging it up.  Have you seen any difference today, as it gets another day of charging?

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