Battery Choice Opinion Please UPDATE
Updated 26 April ---------- Thinking of getting one of these to replace an old pair of wet 6s, where the price here is similar to new 6s. Not sure if it is suitable for RV use doing 50-90s some...
Forum Discussion
The battery checked out ok for camping. It is rated at 250AH and spec is 95% at about 18C for inside the RV so call it 237ish.
I used about 30AH a day from it at under 20 amp draws, with no charging from solar or alternator during that time. The spec resting voltage vs SOC graph is vague, but here is what I got using the Trimetric. (Start Full 13.04v --Voltages were near resting--under an amp draw.
12.9 down 15AH,12.7 down 32 to 38, 12.6 down 56.6AH, 12.5 down 82AH, then had to use multi-meter to get two decimal places for voltage since "12.4" is somewhere near 50% SOC on the graph (I think).
12.46 down 98AH
12.43 down 104
12.40 down 112
12.36 down 120 (so 50% of 237ish)
12.30 down 130--ends--plugged solar back in and alternator for the drive home.
The spec voltage/SOC graph for this 6GFM250 AGM is the same as for my 12v 100AH AGMs for which I have the link here--so you can see how difficult it is to specify from the graph where 50% is :( If anybody has a clue how to read that for real life work, please post that info! Thanks.
Scroll down to graph on the right.
http://www.wegosolar.com/products.php?product=SKR%252d125AGM-Stark-AGM-12V-Solar-Battery-Sealed-125A
I used about 30AH a day from it at under 20 amp draws, with no charging from solar or alternator during that time. The spec resting voltage vs SOC graph is vague, but here is what I got using the Trimetric. (Start Full 13.04v --Voltages were near resting--under an amp draw.
12.9 down 15AH,12.7 down 32 to 38, 12.6 down 56.6AH, 12.5 down 82AH, then had to use multi-meter to get two decimal places for voltage since "12.4" is somewhere near 50% SOC on the graph (I think).
12.46 down 98AH
12.43 down 104
12.40 down 112
12.36 down 120 (so 50% of 237ish)
12.30 down 130--ends--plugged solar back in and alternator for the drive home.
The spec voltage/SOC graph for this 6GFM250 AGM is the same as for my 12v 100AH AGMs for which I have the link here--so you can see how difficult it is to specify from the graph where 50% is :( If anybody has a clue how to read that for real life work, please post that info! Thanks.
Scroll down to graph on the right.
http://www.wegosolar.com/products.php?product=SKR%252d125AGM-Stark-AGM-12V-Solar-Battery-Sealed-125A
