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landyacht318's avatar
landyacht318
Explorer
May 29, 2016

Some battery temperature data during high amp recharge

Northstar group27 AGM battery. 90Ah capacity. 5:58AM 53Ah from full, 12.1v under 0.8 amp load 62.2f battery, 61.3f Ambient Apply Meanwell's 40 amps set to 14.9v( accounting for voltage drop on...
pianotuna's avatar
pianotuna
Nomad III
May 31, 2016
Look at the temperature of the battery. My guess is that with an initial low temperature (ratings are done at 77 f , 25 c) that affects the rate of charge. Then the jar warms up and gets "back on track".

landyacht318 wrote:

Started at 64.2f, now upto 70.1f

I am curious as to why the initial voltage yoyo occurs some times, and not others.

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