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Originally Posted by RJ82much
...A series connection of batteries will increase the voltage (A trick to start old 6 volt construction equipment was to apply 12 volts to the starter, with the 6 volt battery disconnected!) without affecting the capacity.
A parallel connection will increase the capacity (per the above reference). Apparently, you have made a very wise choice in your conversion to 12 volts. Now, how do you make your propane hold out for more than a couple nights in cold temperatures?
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What you say is true, but I think you have reached the wrong conclusion by not looking at the details. What you want in either case are true deep-cycle batteries that are built to take deep discharges without damaging the battery. Given that, take a look at the specs on deep-cycle batteries, such as those put out by Trojan --
http://www.trojanbattery.com/Products/d ... RV_000.pdf
Note that using double the capacity of their 12-volt deep-cycle battery is still typically less than the capacity of a single 6-volt deep-cycle battery. For example, two type 27 12-volt deep cycle batteries would provide 400 minutes at 25 amps while one type T125 6-volt battery (two in series) would provide 488 minutes at 25 amps. Similar conclusions can be drawn using the amp-hour capacity calculations at the 20-hour rate.