full_mosey wrote:
HiTech wrote:
Depending on how long it is applied, 14.4V into a charged AGM will accelerate outgassing and dry it out. Anything over the float voltage into a fully charged AGM will cause some extra gassing, though if the time is short it does not amount to much.
Jim
Could be.
Last Summer the Deka was in the van and charged with the MS SS-10. This year the pair of Optimas are in the van.
The SS-10 is a 2-stage, no float, controller. I'm thinking that the Amps are very low and there may not be enough power to cause outgassing when the batteries should be at float Voltage. At 3PM today, the IR gun showed the Optimas at 106.5F and 13.8V per the Turnigy.
We are between trips where the Optimas have no load and should be charged soon after daylight. Therefore, the Optimas are now being maintained at 13.8V by temp comp for nearly all day. Will they outgas? Don't know, but I would bet against it.
HTH;
John
What is the spec for float voltage for the Optimas? My guess would be that 13.8v is high for a float unless that is before temp compensation and the actual voltage at 106 degrees is much lower, and they are outgassing quite a bit. My experience is that above 90 degrees battery temp my AGMs outgas very very easily as they near being fully charged. I don't remember off the top of my head but I think float at 90 degrees for the Dekas is near 13.3v. Optimas are probably a bit higher than the East Penn batteries.
Jim
