new PD9245 question on paralleling batteries

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stuartmacnb

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Feb 4, 2013
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i finaly got my new new PD9245, installed, and my battery was down to about 5 volts,  as the trailer has had power issues all winter.  i would like to add a second battery to the stock single. 

my question on what is a better set up.  several 6v's or just adding another 12v, and if so will simply paralleling them be all i have to do?

can the 9200 series inverter handle charging multiple battery's
 
You will wind up with more amp/hours with 4 six volt batteries as opposed to 2 twelve volt batteries, but by adding a second 12 volt, you would still be doubling what you have. Normally it is wiser to replace batteries all at the same time so they are all in the same condition, and while the PD charger will take a little longer to charge up the multiple batteries, it will work just fine.
 
To add to Water Dog's info; it is never wise to mix and match batteries.
You should use all 12V or all 6V in your battery bank.
Bob
 
The first thing I would do is scrap that battery that has drained to 5-volts.  It's unlikely that you can revive it to any degree, and you certainly don't want to pair it with a NEW battery unless it tests A-Okay.

I would think the weight of 4 six volt batteries would be prohibitive in the average trailer environment. YMMV
 
A common question.

Some numbers.  For a true deep cycle battery you can use safely about half it's capacity before serious damage sets in, For starting types, INCLUDING Marine/Deep cycle, you should avoid goign that low, keep if closer to 3/4 or more if possible,  Damage means a serious reduction in battery life, MOST starting batteries at 10 volts, are toast.

DEEP CYCLE.... Well I've seen them recover from 10 volts (NOTE that is WAY TOO Discharged).

The numbers below reflect total battey capacity, does not matter what type. Numbers are n earlly identical for all makes and models EXCEPT OPTIMA which you multiply by zero point six (60%) as.. Well Optima batteries are 40 percent wasted space.

Group 24, around 75 amp hours at the 20 hour rate (All figures are 20 hour rate)
Group 27, Just under 100,  Group 29 just over 100
Group 31, 130
GC-2 (six volt golf car, you need 2 in series) 220-230 (NOTE: These ARE deep cycle)
8-D 250

In addition to this, the single most popular battery size in 12 volt rechargable lead acid "Auto type" batteries is teh GC-2, used by golf cars from coast to coast. This is changing as some golf cars now use 12 volt batteries, but,,,, The six is still most common, this means the per-unit construction cost is lower  Making them the best bang for your buck.
 
Your batteries must be the same age and manufacturer or they will default to the lesser.
Good info http://www.windsun.com/Batteries/Battery_FAQ.htm

Oh and I have a single 150 AH Lifeline AGM, sufficient for our needs, so 6 V 12V no real difference.
 
Multiple 12v are simply wired in parallel. 6v or wired in series in pairs, and if you have more than one pair, each pair is wired in parallel just as if the pair was a single 12v battery.

A pair of 6V golf cart batteries is the least expensive way to get a quality deep cycle battery bank with about 230 amp-hours of power storage. A pair of Group 29 or 30 12v deep cycles would provide about the same amount of power, but chances are you would have to pay a substantial price premium because they are not a commonly available size and type.
 
Hi Ho:  What Gary said!!  I'm sure you realize that there is a difference between marine/deep cycle batteries and real deep cycle batteries (like golf cart batteries), which is what you really want.  The most cost effective solution I know is Costco or Sams Club for gold cart batteries.  If you have room (including height) for two of those 6 volt batteries in series that would be my solution.
 

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