Quote:
Originally Posted by johnbryanpeters
Let's look at Trojan's AGM specs, to pick something. Let's also look at WFCO and Progressive Dynamics converters. - Both are OK on bulk voltage level, but WFCO spends little or no time there.
- Both are about a volt low on absorption voltage level, leading to longer charging times.
- Both are about half a volt low on float level, not sure of the impact, if any, of that.
Both will charge without damaging the batteries, neither optimally in terms of getting batteries fully charged in the least time, which is what we're looking for in an RV.
They're not designed, nor can they be adjusted, to AGM requirements.
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Well we are agreed that WFCO makes a less than optimal charger... and Progressive makes some very good ones but my point was that all 3 stage chargers are safe for AGM's and that remains true. The Progressives will take slightly longer than a perfect charger for the particular brand battery at hand,,, and the WFCO's can take quite a bit longer.
I'd also note that if you use the Deka/EastPenn AGM's...the charging parameters are much more like the Progressives program. My guess is that it is similar with other more conventional brand agm deep cycles but I haven't checked.
The real culprit in a lot of AGM battery failures is not the charging parameters but the operating temperature. If you're gonna be operating batts in spaces that regularl get above 90 degrees...you're gonna lose some life if you don't have a temperature compensating charger. Batt's will lose about 5-10% of cycle life if charged at .3V over max. recommended voltage....and a LOT more life if regularly charged at more than that. (.7v over effectively destroys them) and as you can see...as the temperature goes up...even units bulking out at 14.2 can be too much. You can also see that a 13.2V float is a lot safer than 13.4 in hot weather float situations.
The Deka AGM chart here is for that brand but voltage parameter temp adjustments would need to be made on any mfrs formulation.
Those in Fl or Arizona might want to think twice about AGM's vs. wet cells for long term plug in use or float. IMO...wet cells and a pro-fill system will keep the maintenance easy and the life long.