AGM Spiral Preset for Rolls VRLA AGM

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hastings asked May 19, '21

AGM Spiral Preset for Rolls VRLA AGM

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

The Victron 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?

The Rolls manual also gives 40A for the Charge Current. Should I change the default Preset 2 Charge Current of 100A to 8x40(320)A?

Thanks

AGM Battery

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Answer 1 · 2023-08-05T11:08:45Z

mikaeel answered · Aug 05, 2023 at 11:08 AM

how did you do it finally?

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Answer 2 · 2023-12-17T12:39:27Z

hastings answered · Dec 17, 2023 at 12:39 PM

@mikaeel

I did raise the absorb voltage to 58.8V.

Two years later I discovered the excellent Rolls support website. They respond within hours and gave me all the correct Multiplus Inverter/charger/SmartSolar settings to use specific to my battery bank.

The Victron Preset 2 (for Victron AGM batteries) was a poor choice due to the short Absorb times produced by Adaptive charge curve setting. It is now set to Charge Curve Fixed (amongst other changes to settings).

If you have Rolls batteries, don't make the mistake I made and try and set things up just using the Rolls battery user guide and this Victron forum excuse for product support. Go open a support ticket at Rolls without delay.

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