Rolls AGMs “S6-275AGM-RE

[RV8R]

So @HarryN asked me to post a bit about my Rolls AGM experience.

I have purchased 3 sets of;

Rolls AGMs “S6-275AGM-RE

For a couple of Van builds & also my Off Grid Cabin.

I have had great success with these 6v AGMs as a 2 battery bank in series to make up 12vdc @ 250Ah.

The systems I use them on are very basic & simple & very conservative in energy use & design.

For my Promaster Van, I charge them by DC2DC alternator & I use a Kisae 1250.

For my Off Grid Cabin, I charge them by 600W solar array & Victron 100 | 50.

Why not LFP ? Well at the time I purchased these AGMs I had a saying for LFP & that is they are great except for the 3Cs;

Cost ( no longer a factor )
Charge Complexity
Cold

 

[RV8R]

Here is some info on the Rolls;



Here is the Temperature Graph;




Reduced capacity, but will function @ -30C


Here is the manual;

https://rollsbattery.com/wp-content/uploads/2019/11/Rolls-Battery-User-Manual.pdf

Here is a note of my stored over the winter batteries;




Here is a photo of my Cabin Rolls;



Note; On the actual battery label max charge current is spec’s @ 87.5 amps ,,, where as Rolls’ performance specs state 75 amps. I have not researched this discrepancy. I cap my charging at 50 amps (as recommended).

 

[Bluedog225]

Those were very cool batteries. But if it gets down to -30 C, I cease to function.

 

[RV8R]

Those were very cool batteries. But if it gets down to -30 C, I cease to function.

,,, Ya my performance drops off drastically below 10 C

 

[HarryN]

Those were very cool batteries. But if it gets down to -30 C, I cease to function.

Yes, but that is when you need your electrical system to work the most - when you are barely able to function.