B2B with gel? (1 Viewer)

Oct 30, 2016
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Colchester
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On 3rd van so not a total newbie....
We have 246ah of gel, and although a lot of solar, this time of year it struggles, we tend to only stay on sites for a day or two, and then normally about at hour to the next stop.
Normally B2Bs are tales about with lithium, which we will probably get at some point, but can we use b2b on gels? Whilst driving we only get about 6a going to the battery - about 2% an hour.
If so, what size b2b should we go for?
 

grasscutter

LIFE MEMBER
Oct 11, 2009
2,487
8,951
East Wittering. West Sussex.
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Hymer Exsis i588
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Started in 1980
My Victron B To B puts out 30amp to my lithiums.
There are different charging profiles that can be selected.
A quick google on Victron gel batteries show that their max charge input is 30amp so I would have thought it would be beneficial to you if it’s set to the correct profile.
Greater minds than mine will be along shortlyđź‘Ť
 
Apr 27, 2016
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Manchester
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Since the 80s
For 246Ah of gel batteries, the C/10 charge rate is 246/10 = 24.6A, and the C/5 charge rate is 246/5 = 49.2A. A 30A B2B would be not much more than the C/10 rate, which is the optimum for best battery life. The C/5 rate is a good compromise between slightly reduced battery life and reasonably fast charge rate, and a 60A B2B is more than that, so probably not a good idea. Of all the battery types, gels are the least tolerant of excessive fast charging. Some B2Bs have a selectable setting, I think one of the Renogy B2Bs can do 45A.
 

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