Amp Hour question

4aSong wrote:
When setting proper battery size and type the controller has a rated value field for the Amp Hours which I cannot locate on either of my 12 volt Interstate group 24 (HD-24-DP) batteries

75 amp hours each 150 total (Well 73 and 146)

Group 24 about 75 (73)
Group 27 Just below 100 (95)
Group 29 Just above 100(105)
Group 31 About 130
Size 4D 230
Pair of GC-2 Wired in series to make one BIG 12 volt..210-230 (See 4D)

You can use the Round number but there is a slight difference between one brand and another (As you can see the difference is very small).

In addition: GC-2 (And you can get a 4D this way) are DEEP CYCLE
Most of the batteries identified as GROUP XX above are MARINE/deep cycle starting batteries.. What is the difference?

A MARIN/deep cycle should be kept around 3/4 full at the minimum, that is out of every 100 amp hours of capacity only 25, perhaps 30 are usable before serious long term damage sets in

A true DEEP CYCLE like the GC2 you can to to half full without doing serious damage.

Next we get Floooded Wet Cell,,, Maintenace free, AGM

The flooded wet you can add DISTILLED water as needed to replenish that which is "Boiled" off (Itis not really boiling it is electrolysis)

The others you can not SOME (myself included) think this is an advantage for Flooded wet.

AGM may well have a lower INTERNAL resistance They can also be mountd without regard to "THIS SIDE UP" You can find small (GROUP ##) AGM in DEEP CYCLE types.. THEY ARE EXPENSIVE.

GC-2 is best bang for your buck (Baring one heck of a sale on AGM)