Two 6 volt vs two 12 volt run time
I was just informed that two 6 volt batteries would run the residential refrigerator many times longer than two 12 volt batteries. I wonder if this is just hype?
Forum Discussion
A deep cycle battery will also start and engine as ours have 810 cold starting amps each as listed on the manufacturer's label right on the top of each of our 12 volt group 31 deep cycle marine batteries. Our diesel truck has 2 large batteries for starting the diesel engine and their 2 battery cold starting amps are just a fraction of what the 5 deep cycle batteries will deliver thru the #2 gauge cables from the RV.
Standard vehicle starting batteries make very poor long draw from batteries as they are designed to give a high amperage shot duration amps unlike deep cycle batteries which have much thicker plates but fewer inside the lead/acid batteries. See one of each broken apart and it's obvious! Having Less plates means less plate surface but thicker plates gives a much longer useful working life but also less cold starting amps but still plenty to start an engine normally. Just will not give that instant short high RPM spin that some older worn engines may want to have to start them in the very cold temps.
My system design on each pf my trucks also includes the ability to jumper the RV batteries to the engine starter circuit + junction block in the case of the truck batteries failed or get run down somehow or even get shorted out inside. Just disconnect the cable to the shorted out battery and jumper the RV batteries cable connection under the truck hood at the alternator + junction block, start the engine, and be on your way!
Give it some thought!
Standard vehicle starting batteries make very poor long draw from batteries as they are designed to give a high amperage shot duration amps unlike deep cycle batteries which have much thicker plates but fewer inside the lead/acid batteries. See one of each broken apart and it's obvious! Having Less plates means less plate surface but thicker plates gives a much longer useful working life but also less cold starting amps but still plenty to start an engine normally. Just will not give that instant short high RPM spin that some older worn engines may want to have to start them in the very cold temps.
My system design on each pf my trucks also includes the ability to jumper the RV batteries to the engine starter circuit + junction block in the case of the truck batteries failed or get run down somehow or even get shorted out inside. Just disconnect the cable to the shorted out battery and jumper the RV batteries cable connection under the truck hood at the alternator + junction block, start the engine, and be on your way!
Give it some thought!
