Camping in the Cold--Some AH Figures
So camping off grid for four days--arrive Monday go home Friday temps : Night 0C/32F , Day 7C/44F-ish (Annual Rathtrevor provincial park late January episode to start the year off) Park gen hours 9-1...
Forum Discussion
I am not seeing the significantly faster loss of voltage with my middle aged TPPL AGM at lower temperatures.
This morning, my AGM battery got down to 46F by sunrise, At sunrise my monitor indicated I took 48AH of its 'new' 90Ah capacity from it and was still 12.2x volts under a 0.3 amp load before sunrise.
I am used to seeing similar morning voltages for Ah removed in 60 +F over night temperatures, and I do notice my battery is aging, but what makes me notice it is NOt overnight voltage held under load for Ah removed, but Amps required to attain near instant absorption voltage when depleted are half of what it required when new.
Also, amps take longer to taper to 0.4 or less at absorption voltage, meaning on solar I better get to Vabs earlier in the day and that requires alternator or 'other' charging sources, or less overnight usage, which I rarely ration.
You had a chance to collect any Data on your group 27 UPG AGM yet BFL13?
This morning, my AGM battery got down to 46F by sunrise, At sunrise my monitor indicated I took 48AH of its 'new' 90Ah capacity from it and was still 12.2x volts under a 0.3 amp load before sunrise.
I am used to seeing similar morning voltages for Ah removed in 60 +F over night temperatures, and I do notice my battery is aging, but what makes me notice it is NOt overnight voltage held under load for Ah removed, but Amps required to attain near instant absorption voltage when depleted are half of what it required when new.
Also, amps take longer to taper to 0.4 or less at absorption voltage, meaning on solar I better get to Vabs earlier in the day and that requires alternator or 'other' charging sources, or less overnight usage, which I rarely ration.
You had a chance to collect any Data on your group 27 UPG AGM yet BFL13?
