dickreid1 wrote:
My previous experience was that having the extra capacity to keep the coach heater going all night when boondocking would be worth the $400 expense.
I'm scratching my head over your statement above about the coach heater requiring 6V batteries to go all night ... also kindof perplexed as to why Ron thought he had to go to 6V batteries in the first place in light of his willing to pay AGM money. :h
If your PC motorhomes had room for a couple of 12V Group 27 or Group 29 or Group 31 12V batteries, and if either/both of you were willing to lay out the cash for AGM batteries, then a whole different 12V battery world opens to you. That world is the deep cycle world - in which there our plenty of true deep cycle 12V AGM battery makers and models available.
My take on 95+% of all the "6V versus 12V" forum discussions usually boils down to - after several pages of words - what is getting compared is 6V true deep cycle (i.e. "Golf Cart") wet cell batteries to 12V wanna-be deep cycle (i.e. "Marine/Starting") wet cell batteries. The reason for this comparison being that 12V true deep cycle wet cell batteries are as rare as Chickens' Teeth to find, leaving 6V true deep cycle wet cell batteries of the commonly and cheaply available Golf Cart type as the final battery of choice for folks who didn't want to spend AGM money.
Wanting deep cycle 6V AGM batteries over deep cycle 12V AGM batteries I don't get at all - especially of one had room for the 12 volters in the first place and so didn't need to spend money to make room for 6V golf cart batteries. :h
Our two Group 29 true deep cycle 12 volt 100 amp hour AGM batteries easily power our propane furnace all night (it cycles - doesn't run continuously), plus another night, plus a non-steaming CPAP machine every night.
Also, the argument that one can get a lot more amp hours of battery power from a couple of 6V golf cart batteries than from a couple of any common group size 12V true deep cycle AGM battery doesn't hold a whole lot of water either, anymore. For example, here's a (heavy, hence with a lot of lead) 12V Group 31 true deep cycle AGM battery that stores 115 amp hours - so a pair of them would be 230 amp hours - right up there in the ballpark with a couple of the common size 6V golf cart batteries:
http://www.dcbattery.com/fullriver_dc115-12.html
