Battery price question...
It's time to replace the single 12V we have on our trailer. We do boondock from time to time so I have been reading a lot on these forums about 6V vs 12V. My question here is, where are these inexpe...
Forum Discussion
Gdetrailer wrote:
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The big downside to parallel operation is not "everything" is "shared", due to manufacturing and material tolerances the batteries will never "share" the current load 100% equally, resulting in one battery discharging or recharging at a different rate. You can get them close but in the end one battery will be slightly weaker and that weaker one will ultimately kill the other battery by over discharging and undercharging.
The 12V batteries due to thinner and lighter plates are also NOT designed for very deep draw downs, typically rated at only 50% DOD but for max LIFE only 20% of their capacity should be used..
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Variances between 12 volt batteries is corrected by doing a balanced connection, connecting the house + connection to the + terminal of one battery and the - house connection to the - terminal of the other battery, then running equal length connections between batteries:
I use 2 AGM batteries made by Northstar and they are rated for 400 cycles at 80% DOD and the cycle count goes up from there with lower DOD.
