12.0V is about a 20% state of charge
Originally Posted by ependydad
The kid yesterday when I dropped it off said it was reading 12.0volts when he put a voltmeter on it and told me to not have high hopes.
Unfortunately today, he was with a different customer as the kid I got today wasn't extremely helpful- he plugged in a portable machine, it did it's thing and he said it was showing good.
So that's where I'm at.
I did measure the compartment/battery box. Strangely, there's a huge amount of storage space down there, but only a small inset for a battery (12"x7" and maybe 10" tall).
... bad and damaging to let any 12V battery get that low. Did you charge it fully
overnite and THEN let it rest for at least 24 hours before that measurement was taken???
If so...replace it. If not..DO THAT first then just check your own voltage with a multimeter...DO NOT MEASURE UNLESS THE BATTERY has been off charge and disconnected for 24 hours
12.6-12.7V ....fine and dandy
12.4-12.5V....lost some capacity and aging.
12.3....or less...time to get a new one.
NOW...note that you have DP dual purpose marine max group24 battery. This is capable off storing around 75-80 amp hours of which you can USE half while out camping and without "shore power". That is NOT much. I would want at least double that to do overnite camping as 35-40 amp hours won't support much electrical use.
Note also that marine max makes a DC24 (deepcycle) which is a true deep cycle. You won't get more amp hours but you will get more cycles before death!
To get more amp hours you need to add another group 24, or replace the existing with a larger pair of 12V or 6V batteries...more if you want to boondock a lot.
Hope this helps a bit and lets you play more movies!
Edit...Herk just beat me to the punch & he has it all right. I just note that while a single group 24 in great shape COULD power your furnace all nite...it would not do that and your lights or TV etc. without getting below the 50% threshold where damage gets done to battery life.