dockmasterdave wrote:
If I replace with either 1 or 2 group 27 real deep cycle batteries, does it hurt them to not be cycled deeply?
Batteries come in several types
Starting(Like you have in your car) really do not like a deep cycle, but man can they put out AMPS when the starter calls for them.
Multi-Use or Marine/Deep cycle,, Nearly as good at starting, and do no mind a "Medium" cycle (Say 75% soc) but do not really like DEEP CYCLE (50% or less State of charge)
DEEP CYCLE: Not nearly as good at high amp loads (But read on) but do not mind 50% soc at all, so long as they get filled back up soon.
IF you have room for TWO Group 27's (around 190-200 amp hours total capacity) Why not go with a pair of GC-2 in series, (220-250 depending on the sub model, 220 and 230 being most common)
These are TRUE deep cycle, flooded wet cell (normally, though you can get AGM if you wish) bit heavy so they will increase your weight. but with a decent converter and occasional (like monthly) check of the water level and a bit of distilled as needed... 7-10 years is not uncommon (mine went nine with abuse) what is abuse, Like 10-20% State of charge or lights would not light.
OH, why are the GC-2's so popular I mean they do make a 12 volt battery with a 230 amp hour rating (a 4D).. Cost. they make so many of them that the per-unit cost is lower.