Deka DC31DT battery? Deep Cycle?

DiskDoctr wrote:
Now I'm REALLY having trouble reconciling the "20 amp hour rate" of the GC2 vs Group 31 :h

Seems to me you're going to great effort to confuse yourself :R ... neither of these batteries you've mentioned are AGM but rather conventional flooded. As I already mentioned that Group 31 DC31DT Duracell branded battery is actually a Deka manufactured by East Penn and is the exact same battery sold by East Penn here in Canada as an RV Care Traveler's Choice battery, 20 HR rated @ 105 AH, 210 AH for a pair wired in parallel. GC-2 Duracells are likewise East Penn Dekas, also sold here in Canada as the RV Care Traveler's Choice PS2000, 20 HR rated @ 215 AH each and therefore 215 AH for a pair wired in series.



Between these 2 choices I wouldn't be worrying about a mere 5 AH difference but rather which ones (Group 31 or GC-2) would best fit where you intend to locate them on the trailer. Secondly, if your intention is to regularly deep cycle these batteries then you'd probably be better served with a pair of GC-2s which are designed for this purpose. Alternately, if you anticipate deep cycling your batteries only occasionally but do expect them to regularly tolerate heavy inverter load then you're probably better off with a pair of Group 31s as they're more likely to suffer less voltage drop under heavy load than will a pair of GC-2s.