BoonHauler wrote:
KATOOM wrote:
What I'm replacing are two older group 27 Kirkland batteries. The only info they have, besides cranking amps, is 115 min reserve. Nothing pertaining to amps hr.
KATOON:
Those batteries were not a deep cycling battery. CCA (Cold Cranking Amp) are listed on 'Starting' batteries like you have under the hood in a vehicle and most likely the reason they've failed on you.
Whether you go with a 6 or 12 volt battery make sure it's a true 'Deep Cycle' battery sometimes refered to as 'golf cart' batteries.
...
CCA is also listed on dual-purpose "Marine/RV" batteries, which are somewhere in between "starting" and true deep-cycle batteries in terms of longevity.
There's no doubt that true deep cycle batteries, like golf carts, have the largest number of deep discharge cycles. But unless you have a lot of them in parallel, the FLA versions will also exhibit more voltage drop under heavy inverter loads than FLA Marine/RV type batteries with the same Ah.
It's a problem of balance. People with occasional high inverter loads and little space or weight constraints might prefer Marine/RV batteries.
