Originally Posted by mbbear
I'd like to join Ellpea's question - what is the advantage of two 6v as oppos two 12v? I know I want two batteries because I will be doing a lot of boondocking
, but I don't ha e a clue which system is better. I will also have at least 100 watts of solar
for charging. Thanks
Six volt batteries weigh more than 12 volt batteries because there is more lead in them. They are designed and constructed to provide more power over more hours and years. So if you take care of your batteries (don't drain them below 50%, keep charged all year, add water as needed, use a charge wizard if you use your converter for charging)
they will last years longer. If you don't take care of your batteries buy cheaper 12 volt batteries and replace them every year or two. Many folks with well cared for 6 volt batteries report 10 years or more dependability. Most cared for 12 volt batteries give up around year six.
Any lead-acid battery
will provide more energy in warm temperatures. (The rate of chemical reactions in batteries decreases in cooler temperatures, meaning less power available) If you do much cool weather camping placing the batteries in a heated space will result in more available energy. That's one reason cars have a harder time starting in cold weather. Cold viscous lubricant is another.
That said, my factory 12 volt deep cycle provides plenty of energy coupled with a 100 watt solar panel
. I can go for 3-7 days with no sun depending on how much the furnace
runs. With 4 hours of daily sun stays can be weeks long. In a few years when my battery
dies I might go with 6 volt Trojans, or maybe Lithium Ion if prices come down. Right now I don't see a good reason to upgrade. The extra weight
of two batteries figures into the equation too. Li-ion is much lighter in weight
and can be safely drained far lower than lead acid.