Bob. Though I'm one of the big pushers of the six volt pairs here I'm going to disagree with your lecturer and go back to what I said in a prior post.. Up till recently.. I would have agreed with what you typed. Most 12 volt batteries were not "Deep Cycle" but "Marine/Deep Cycle" which is really a starting battery with delusions of grandeur far as I'm concerned
However there are new Golf cars coming out that run on a higher voltage, these use 12 volt batteries instead of six volt. so the battery industry has responded by making 12 volt DEEP CYCLE in sizes we can wrangle.
Actually there always have been 12 volt deep cycle batteries out there, Just not in handy sizes.. I recall one year I was Field Day chairman for our ham radio club and I decided we would do it on battery power
I visited a local battery re-builder, they used a fork lift to load the single 12 volt deep cycle battery (Same size as the one that powered the fork lift that loaded it) onto my U-Haul and I towed it up field day hill.
We did right good in the contest that year
I then towed it back, They forked it off the trailer, said we used about 10% of it's charge, and I returned the U-Haul
That was NOT a battery I'd care to install in my motor home however (Exceeds teh CCC of the rig)
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Home is where I park it!
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