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mr green

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Posts: 2
Reply with quote  #1 
I have a outback flexmax 60 and have 4 rolls batteries s55 models I had this system for one year now and now playing with settings and doing equalization .I did my first eq yesterday and looked up the rolls manual and set the eq as stated at 15.9 and did it for 2 hrs. now I see a chart in the rolls manual to set absorb time and I don't understand it at this time(to green I guess) I think right now it is set at 1 hr , I have two 260 watt panels and 4 rolls s55 and loose the sun at 4 pm in summer, but will be adding 2 more rolls batteries and two more 260 watts panels to catch after noon to evening sun    I also set my float at 14.2 and absorb and bulk to 15,5 for temperatue compensation as per rolls chart   I am currently have batteries outside at average -10c

Rick H Parker

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Posts: 770
Reply with quote  #2 
You sure the model number is S55 not S550? I cannot find a Rolls S55 anywhere.

The Equation for Roll's flooded lead acid batteries.

Where :
T = Absorption  Charge Time in hours.
C = 20 hr Rated Capacity (total battery bank)
I= Charging Current (Amps) 10% of total bank Ah or maximum charge current whichever is greater.

T=0.42 * C/I

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
mr green

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Posts: 2
Reply with quote  #3 
you are correct they are the s  550
Rick H Parker

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Reply with quote  #4 

20 hr rated capacity for the S550 is 428 Ah.
12 volt bank total Ah = 856Ah @ C20.
24 Volt bank total Ah = 428Ah @ C20.

Where :
T = Absorption  Charge Time in hours.
C = 20 hr Rated Capacity (total battery bank)
I= Charging Current (Amps) 10% of total bank Ah or maximum charge current whichever is greater.


T= 0.42 * C/I


If your battery bank is 12 volts and your charge controller is at least 85.6 amps, Absorption  Charge Time = 0.42 * 856Ah/85.6A = 4.2 hours. 
If your battery bank is 24 volts and your charge controller is at least 42.8 amps, Absorption  Charge Time = 0.42 * 428Ah/42.8A = 4.2 hours.

If your charge controller is less then 85.6 amps for a 12v bank or 42.8 for a 24v bank, your need to calculate Absorption  Charge Time using 10% of the charge controller's current rating for I.  

Rick H Parker


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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
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