I understand that with a Classic controller, Whizbang Jr., and flooded lead-acid batteries:
1. As Bulk charging proceeds, battery voltage increases, until...
2. the battery voltage reaches the Absorb voltage setpoint, at which point...
3. the charging stage transitions to Absorb, voltage is held at that setpoint, and...
4. charging current decreases until it falls below the End Amps setpoint, at which point...
5. the charging stage transitions to Float.
I have three questions:
1. The rule of thumb for setting End Amps is 2% of the bank's c/20 rate. In my case, with a 48 volt bank of 8, 6 volt, 370 ah batteries, this would be around 7.4 amps. But the actual behavior of my system is that Absorb amps level off around 10.5 amps, at which point the battery temp starts to rise. So I've set End Amps at 11. What does this behavior tell me about the health (or sickness!) of my batteries?
2. How much time does the Bulk charging voltage need to be at or above the Absorb setpoint in order for the charge phase to transition to Absorb?
3. How long does Absorb amps need to be below the End Amps setpoint in order for the charge phase to transision to Float?
Thank you.
You have the same question in two different spots on the forums .
I answered you here
http://midniteftp.com/forum/index.php?topic=4190.new#new
Larry