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Old 03-10-2010, 11:41 PM   #43
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Two 6 volt batteries is better then two 12 volt batteries but its not always practical because Airstream and most travel trailer manufactures don't give you the option.
I define better in terms of expected discharge cycles, not unlikely failures.
We test them. Folks, the world doesn't end if you develop a bad 6 volt battery. It just means you were unlucky. Always split aces and eights.
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Old 03-11-2010, 12:05 AM   #44
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Two 6 volt batteries is better then two 12 volt batteries but its not always practical because Airstream and most travel trailer manufactures don't give you the option.
I define better in terms of expected discharge cycles, not unlikely failures.
We test them. Folks, the world doesn't end if you develop a bad 6 volt battery. It just means you were unlucky. Always split aces and eights.
That would be: Two 6 volt batteries ARE better than two 12 volt batteries ...

No facts presented to support this assertion ...
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Old 03-11-2010, 12:07 AM   #45
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SO ... lose 1, 6 volt, system hosed ... lose 1, 12 volt, system "probably hosed" ... would that be an accurate summary?
Bob
Bob, I've only had one experience losing a battery. At the time I had two 12v Interstates. When the one battery shorted I was plugged into shore power and the cheap one-stage Parallax installed by Airstream tried it's damnedest to charge sensing low voltage. I'm not sure how long it took, but it was hours, not days, before I found a toasted smoking charger (under the bed!). I had one dead 12v Interstate, BUT yes I still had another good 12v Interstate. It sits in the garage on a BatteryMinder unused, but it might still be OK (haven't had a need for it yet).

Now I'm running with an IOTA-55 3-stage charger with built in IQ4 and two 6v U.S. Battery's.

Here's the fried Parallax, blown up Interstate and the battery box mess.
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Old 03-11-2010, 12:14 AM   #46
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That would be: Two 6 volt batteries ARE better than two 12 volt batteries ...

No facts presented to support this assertion ...
No assertion intended, just opinion. I guess I should have prefaced "In my opinion" and thank you for pointing that out.
I would be thankful to read your opinion to the contrary too.
In edit, I see my grammer was off too. Forgive me for that.
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Old 03-11-2010, 12:33 AM   #47
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Originally Posted by newroswell View Post
Bob, I've only had one experience losing a battery. At the time I had two 12v Interstates. When the one battery shorted I was plugged into shore power and the cheap one-stage Parallax installed by Airstream tried it's damnedest to charge sensing low voltage. I'm not sure how long it took, but it was hours, not days, before I found a toasted smoking charger (under the bed!). I had one dead 12v Interstate, BUT yes I still had another good 12v Interstate. It sits in the garage on a BatteryMinder unused, but it might still be OK (haven't had a need for it yet).

Now I'm running with an IOTA-55 3-stage charger with built in IQ4 and two 6v U.S. Battery's.

Here's the fried Parallax, blown up Interstate and the battery box mess.
SO ... you lost a 12 volt battery and a charger and now you run a 6 volt system. WHY did the 12 volt fail? Why WON'T the 6 volt fail? Anecdotal evidence is NOT comprehensive fact. Systematic analysis is ... This is devolving into a 6v vs 12 v thread.
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Old 03-11-2010, 12:49 AM   #48
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Anecdotal evidence is NOT comprehensive fact. Systematic analysis is ...
My search button isn't working. Can you just post the link to your "Systematic analysis"?
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Old 03-11-2010, 12:53 AM   #49
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My search button isn't working. Can you just post the link to your "Systematic analysis"?
Your baiting me ... say what you really mean ...
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Old 03-11-2010, 12:59 AM   #50
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Your baiting me ... say what you really mean ...
That's YOU'RE but I don't think he is baiting. Just wanting your opinion.
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Old 03-11-2010, 01:43 AM   #51
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That's YOU'RE but I don't think he is baiting. Just wanting your opinion.
HAH! Thank you! you're correct! YOU'RE! My opinion doesn't mean anything ... facts and data points do. We need real information to further our RV power systems and not emotional buzz words or pr hype.
I see you sell converters ... interesting.
Bob
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Old 03-11-2010, 02:09 AM   #52
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I agree we need more facts. You are welcome to help point us to them.
Yes, we sell converters and it IS interesting to us. Has been for 8 years. If you need help, I'd be glad to assist but please understand that we don't have the facts, just a little experience connecting wires together to see what happens.
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Old 03-11-2010, 05:39 AM   #53
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Think of all the golf carts in the world. They're used outside in cold weather and scorching heat from the time the sun comes up - to dark, carrying ungrateful golfers, up and down hills. Then they're put away for a charge overnight only to start the whole thing again at sunrise, EVERY day of the week. Golf cart battery's have evolved to serve this type of environment and they hope to grow up to serve in an RV where life is easy for them.
I also believe 6v batteries are built heavier duty to withstand commercial use!
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Old 03-11-2010, 07:24 AM   #54
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ok, first some cool ones for both sides!

my take on this is that both sides are correct in some circumstances. i think we'd both agree that golf cart batteries are built to be abused because that is the nature of their use. nobody likes to service a dead golf cart driven with folks with clubs! 12v deep cycle batteries are customarily used by folks with more concern to not suck the life from their battery.

in a jam, a 12v battery (maybe not the exact replacement) can be easily replaced, a 6v could be a different story. if one 6v dies, both batteries should be replaces anyway and in a pinch, a 12v could be swapped in.

one bad cell in one of two 6v's leave you in the same position as a bad cell in a 12v. in both cases you have less that 12v and the battery converter will not be happy.

two 12v's = four 6v's in the sense that if one cell fails the other 'bank' can still service you.

for me, simple is better. i don't boondock but i have lost power for a number of hours. if longevity of 12v power was so critical, i'd just bring extra batteries so i did not need to count every last amp used. ........ but that is just me.

as i see it, there are about 3 major groups of needs:
always hooked up to elec.
short term bookdock
long term boondock
each group has different needs.

as others have done, i'd like to add a switch to select one or both battery banks with the corresponding unit to independently charge each battery.

just do what you think suits you best
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Old 03-11-2010, 07:43 AM   #55
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..well said, Ricky, each approach has its use..and fans/detractors... I fall in groups 1 & 2: shore power & short term...

..I like my one 12v at this point in time because I don't have massive boondock AH requirements, and I don't have time/money/inclination to relocate the battery from its original location in rear compartment and there's no space to add a second back there (with attendant weight issues)...

..design-wise, if I ever relocate and bump up to 2-6's (I wouldn't worry much about failure, just like I don't worry much about my 1-12 failing, I use an intelligent converter and VoltMinder) I would definitely move them up over the axle in a vented box as the fulcrum effect extended back there is insane...not a great design, imho...
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Old 03-11-2010, 09:13 AM   #56
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You are way more experienced than me and I bow to your expertise ... but how does your statement invalidate my statement? Just askin' ...
My statement only attempts to validate Murphy's corollary, which was demonstrated in a later post by another forum member (the one with the smouldering crater where a battery used to be, and a burned out converter).
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