question

hastings avatar image

Choosing / editing a battery preset for Rolls S12 series

I have 8x 12V Rolls S12 230AGM-RE in two 48V strings charged by 6x300W PV panels via EasySolar 48/5000.

The Victron Connect App factory Preset 2 seems fine except for the Absorb Voltage 14.4/57.6 whereas the Rolls user guide gives 14.7/58.8. (Float is same as the Victron Preset 2)

Should I edit the Preset 2 Absorb Voltage to 58.8 or use the Spiral AGM preset?

Is the higher Absorb setting necessary?

Is the Rolls S12 series a spiral AGM?

Thank you.

AGM Battery
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2 Answers
kevgermany avatar image
kevgermany answered ·

Best to go to user defined and set the Rolls specified values there.


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FRA avatar image
FRA answered ·

Rolls technical services says me that is mandatory to use 14.7v abs voltage and a fixed abs time with their formula 0.38*(capacity /charge current) in hours.

Or a end tail current of 2%, but only after one hour the tail current drop below 2% of capacity.


Rolls agm have a especially thick plates. More like spiral agm, but they are not spiral.


Common standard agm like victronenergy deep cycle have thinner plates respect to rolls agm.

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