LY, I had such wacky weather while Fly fishing on the Madison (all time new cold record temp set for Sept 11th) that with that battery being exposed to 17F near dawn, pipes frozen on a 3 season TT in mid Sept until 12:30 in the afternoon, that that morning's reading could have been a fluke or an outlier (liar?).
I'd wasted the Solar 30 and turned it to junk the day before in horizontal rain for my solar panel system.
I think with warm weather, the batteries chemistry is more receptive to recharging and taking a huge sum of amps, versus trying to jam them in there at 17 F or below freezing. The initial surge was high, but it dropped off quickly. Who knows? The Mega Watt sat outside all night in those temps too, maybe the caps inside it don't do well at those temps at start up, and they need to warm up too?
I just don't know, not enough EE knowledge on all the variables... I just try to give all the variables that I can and let the pro's here make sense of it all.
Pretty sure there was less than 85% in there. I ran the heater and fan the night before, for a couple or a few hours, that's good for 5 amps an hour suckage.
If you have something capable of sucking all those amps in the form of that AGM, and you do decide to step up to a Mega Watt... maybe the S400 model one is the model you'd like to consider.
After 2 days of travel and 1050 miles, and connected to the 7 pin, with a 170 amp output alternator on the 2013 Diesel VW TDI Touareg, yesterday, I was lucky to get the Mega Watt at 15.1 V to out put 7 amps when first plugged in and withing 10 minutes, it's output was 4.5 amps. That's before equalization. Still need to EQ it to a full 16.0V after 11 days of happy camping and fishing.
