Community Forums

wredman · 05-12-2017, 08:28 AM

here is a Trojan size30 12v compared to a good GC2 6v

twinboat · 05-12-2017, 09:00 AM

Quote:

Originally Posted by wredman

here is a Trojan size30 12v compared to a good GC2 6v

Did you notice that the 12 volt battery is good for 600 50% DOD cycles and the 6 volt battery is good for 1200 50% DOD cycles ?

Any true deep cycle battery, I've researched is good for at least 1000 50% DOD cycles.

Dual purpose batteries typically have half as many cycles as true deep cycle, so you need to do your homework, when buying.

In this case if, they were close in price, my $ would go to a pair of 6 volt batteries. They should last me twice as long.

wredman · 05-12-2017, 10:01 AM

I know, was trying to find comparable size weight.

Just a few parameters, L/W/H/weight/cost, there are not may completely similar conversion options between 6v and 12v.

I just called my golf cart dealer, they have the t-105 for 125$ and the t-1275 for 185$

My installation in the coach is height limited, length is nearly unlimited and width has some room. Any taller than I have already with my likely G24 will be even more of an issue to check and fill the water.

xrated · 05-12-2017, 10:17 AM

I just bought and installed a pair of the Trojan T105 batteries in my Toy Hauler. It came with one 12v Interstate group 24 battery (RV/marine) and the capacity of that battery left me wanting. I also had to buy a new battery box, because now I have two batteries instead of one.....Duh! Otherwise, if I would have had two of the 12V batteries, I wouldn't have had to replace the battery box, as they are that close in size. The T105's have a 225 A.H. rating using the 20 hr. criteria and that is going to double (actually a bit more than double) by available A.H. for the trailer. Weight (62 lbs each) wasn't a problem for me, as the Toy Hauler actually need a bit more weight up front because of the loading of stuff in the garage in the back of the T.H. I'm 100% happy so far and looking forward to actually having a 12V system that is usable beyond a few hours or so.

Scottybdivin · 05-13-2017, 07:42 AM

Quote:

Originally Posted by wredman

I know, was trying to find comparable size weight.

Just a few parameters, L/W/H/weight/cost, there are not may completely similar conversion options between 6v and 12v.

I just called my golf cart dealer, they have the t-105 for 125$ and the t-1275 for 185$

My installation in the coach is height limited, length is nearly unlimited and width has some room. Any taller than I have already with my likely G24 will be even more of an issue to check and fill the water.

I had the same height issues when I increase my bank to 8 T-105's. It was recommended on this forum, so I bought the Pro Fill Watering System. One of the best purchases I have made. Makes checking and filling a 2 min job, and they are always filled to the correct level.

theoldwizard · 05-13-2017, 08:41 AM

Quote:

Originally Posted by Scottybdivin

If you look at Trojan's spec sheet, you will notice that the Ah / lb ratio is almost identical across all batteries.

EXCELLENT POINT. A good quick way to compare a battery's capacity (assuming they are the same technology) is to simply compare weights.

theoldwizard · 05-13-2017, 08:46 AM

Quote:

Originally Posted by xrated

I also had to buy a new battery box, because now I have two batteries instead of one.

NOCO makes a battery box that holds two 6V golf cart batteries.

rdrv831 · 05-13-2017, 09:28 AM

Here is something to consider as well. With parallel batteries there is the potential for uneven current flow. Using a bus bar to connect parallel sets is what I use to keep current as even as possible.

My 2cents

Two 6 Volt 200 Amp hour batteries in series:
200 Amp hours @ 12 Volts.
One battery interconnection.
Even current flow through both batteries.
Six cells to check.

Two 12 Volt 100 Amp hour batteries in parallel:
200 Amp hours @ 12 Volts.
Two battery interconnections.
Possible uneven current flow through both batteries, can be reduced by using proper wiring technique.
Twelve cells to check.

twinboat · 05-13-2017, 03:16 PM

Many boondockers and most DP MHs use parallel battery banks, whether in 6 volt series/parallel configurations, or straight parellel.

The cure is to lay out your wiring so that the positive and negetive cables are all the same lenght or place the positive cable on one battery and the negative cable on the other battery. That way the draw has to come from both paralled batteries.

Keeps things balanced.

Roger G · 05-13-2017, 03:52 PM

T-1275 for the 12v cart batteries and T-145 for the 6v in the MH.

Mr_D · 05-13-2017, 04:03 PM

Quote:

Originally Posted by Roger G

A few weeks ago I would have agreed with this statement but I recently ordered 6 12 volt Trojans for my 72v neighborhood cart and while I was ordering I went ahead and ordered 4 6 volt Trojans for the motor home. The 12 volts were only four dollars more per battery. That was one painful check to write but when they came in, they gave me 10% off the quoted price since it was such a big order so I essentially got one battery for free.

Go order 4 or 6 8D Lifeline AGM's at somewhere around $500 each plus shipping or for a bigger shock go lithium!

Mr_D · 05-13-2017, 04:07 PM

Quote:

Originally Posted by twinboat

Are your 8D batteries actual true DEEP Cycle ? Most 8D batteries are dual purpose.

Actually they're AGM's and, as such, are also used as starting batteries too although not in my rig as I have 4 12V 925 CCA starting batteries. Some of the Country Coaches came with two 8-D AGM's for starting (1750 CCA), in fact my printout says that's what it came with.

Roger G · 05-13-2017, 04:08 PM

Quote:

Originally Posted by Mr_D

Go order 4 or 6 8D Lifeline AGM's at somewhere around $500 each plus shipping or for a bigger shock go lithium!

Yea, had made up my mind to put Trojan AGMs on the MH but decided it would just be cheaper to trade for a new MH with new batteries in it in a couple of years!

Mr_D · 05-13-2017, 04:11 PM

Quote:

Originally Posted by wrapperman

Thanks for clarifying my response. It got me thinking, which is sometimes scary. I should have stated I am referring to wet cell batteries.
I bought 2 Trojans T1275 batteries. They fit the battery holder perfect.
Neither am I an expert.
Though I do have a few electric forklifts a my business. They have 18 batteries in each forklift that are connected in series and I must equalize them on a regular basis. My battery specialist says you really can't "desulfurize" a battery because once it produces sulfate crystals on the plates, the sulfate crystals are a stable compound.
Equalizing the batteries brings up the state of charge slowly so they all reach the highest possible charge without damage. So my battery person says.
If I am in error of this statement I always like to be corrected so I won't be telling others anything wrong.

The voltage during equalization is above the normal charge voltage so they come up to full charge quicker. In fact the electrolyte will boil which is why they want the caps loosened or removed.