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Old 03-23-2015, 10:18 AM   #15
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Dennis,

If you have the deck mount unit from P/Lax, then the PD-9260 from Progressive Dynamics would be a good choice.

If you have the combo power center, then you need the PD-4655, which is a direct replacement.


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Old 04-14-2015, 07:10 PM   #16
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Trojan vs Lifeline Dimensions

Quote:
Originally Posted by BoldAdventure View Post
Is the battery box the same size on the 30 as it is the 27? Because Trojan Batteries 31xhs fit with the same modification as the 27's for 260ahs

31XHS | Trojan Battery Company

Photographic proof


But you did say Lifeline, maybe they're bigger. Not to dispute you.
I am a bit confused, because when I compare the Trojan 31XHS with the Lifeline GPL-31XT, the dimensions of the Lifeline are actually marginally smaller than the Trojan.





This gives me hope that I could fit two GPL-31XTs in my 2012 27FB factory battery box, with a little modification of the lip, as BoldAdventure pointed out.

Has anyone had any success fitting a pair of GPL31XTs in their factory box?
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Old 04-14-2015, 09:13 PM   #17
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They should fit. They are a bit shorter and a bit wider than the GPL-27T. I would still look into mounting them in a transverse orientation and compare the final position of the positive terminals relative to the edge of the battery box.

I never have requests for any Lifeline larger than the 27s at 100 amp/hours. The GPL-31T is not worth the extra expense for a mere 5 amp/hours of capacity.

If you look at the pricing in terms of dollars per amp-hour or $/amp-hour:

• GPL-27T @100A/H is $3.50/amp-hour (200 A/H per pair)
• GPL-31XT @125A/H is $3.44/amp-hour (250 A/H per pair)
• GPL-6CT @300A/H is $2.80/amp-hour (priced for a pair, as these are 6VDC)

This is why I sell more of the GPL-6CT than any other Lifeline product. They are also almost 100% mounted inside the trailers, reducing tongue weight as they are placed significantly rearward toward the axles by up to 3 feet.

One other thing. I would SIGNIFICANTLY increase the size of the parallel cables shown in the photo, and place the positive output cable on battery #1 and the negative output cable on battery #2 for complete, even charging and discharging of both batteries.

The purpose of these cables is to join a pair of batteries together as one unit. Do you think the solid metal connecting bus found inside a battery that joins the plates is as small as 6AWG???? I use a minimum of 1/0AWG for simple systems and as large as 4/0AWG for inverter systems, especially for series connections in 6VDC battery banks.
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Old 04-25-2015, 10:20 PM   #18
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Lew, the Optima D31M (75 AH) will fit the Classic battery boxes. The first set (4) I bought lasted seven years with the stock Airstream converter. I found replacements on line for $208 each. Airstream is now using the Parallax 4455TC Paramode with TempAssure in their Classic solar systems. I had to replace mine with the newer one after a power surge fried the old one. I agree that the factory solar system is marginal at best. I would be interested in your upgrade if you would PM me.
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Old 04-29-2015, 01:25 PM   #19
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Just replaced the single stage converter on my 2012 28' FC yesterday with PD4655. Manual says it will take two hours. Took me 1:45 so very straightforward. Only thing that took a little extra time was having to re-route the battery cables from the back of the DC compartment to the top as the connections on the new DC board have to come in from the top. I don't quite understand from a design point of view why they couldn't just keep the DC connection on the same place on the board. A couple of more pictures of the finished wiring would have been helpful.
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Old 04-29-2015, 01:50 PM   #20
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If you pull the entire unit out you can loosen the clamps on the battery cables and pull a little more slack in there. That would put you right at 2 hours...��
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Old 04-29-2015, 04:16 PM   #21
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That's what I did but had to re-feed the cables through the top of the enclosure. If I attempted to feed them from the opening in back the cables would have to traverse the front of the board and would cover 1-2 fuse locations. Like I said, I don't know why they changed the lug locations on the new DC board. The enclosure did not have any hole locations so I had create a 1/2" hole to accept the new clamp assembly.
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Old 05-03-2015, 02:03 PM   #22
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Quote:
Originally Posted by lewster View Post
They should fit. They are a bit shorter and a bit wider than the GPL-27T. I would still look into mounting them in a transverse orientation and compare the final position of the positive terminals relative to the edge of the battery box..
Sure enough, two Lifeline GPL-31XT batteries fit horizontally in the stock box, just like you thought, with only about an eighth of an inch in between to spare. I did have to cut off the lip of the box under the hinge side to fit them in, which was no problem at all. Excellent advice -- thank you for the ideas, Lewster and BoldAdventure. Now I'm rocking 250 amps and the wife's very happy!

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Old 05-03-2015, 06:53 PM   #23
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Nice job! The only thing I would change is the arrangement of your output terminals.

It's always best to draw all of the positives from battery #1 and all of the negatives from battery #2. Thus will insure complete and even charge/discharge of the batteries.

I would also beef up the parallel connections between the batteries. For 125 A/H capacity, I would go no smaller than 1/0 and preferably 2/0.


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Old 05-05-2015, 11:35 AM   #24
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Nice battery upgrade Meddle,

I just acquired a 2012 27' FB International as well and the original batteries are as good as dead, probably due to being left completely discharged.

If I purchase the two Lifeline GPL-31XT batteries as you have, are there any other modifications that need to be done? I'm completely uneducated on the topic of charging.

Thanks
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Old 05-05-2015, 11:59 AM   #25
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YES!

You need to change the converter to a smart 3 stage unit like the Progressive Dynamics PD 4655 or you will kill your expensive new Lifelines in short order!


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Old 05-05-2015, 12:29 PM   #26
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I have a 2001 Classic Excella with 2 battery boxes opening to the front that house two group 27 batteries. These pretty much take up all the available space. So far my batteries are in good shape but going on their 5th year so I may be looking to replace before too long. What is the largest Lifeline that would fit in the space I have and would they give improved service enough to justify the added cost ???

Thanks all in advance. See ya on the road sometime
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Old 05-06-2015, 07:21 AM   #27
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I replaced my Parallax Converter with a Progressive Dynamics PD9260: 60 Amp Converter based on a recommendation from Lew. The swap out took about an hour and the new converter seems a lot quieter than the old one. When my batteries are worn out, I will replace them with Lifelines.

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Old 05-06-2015, 08:43 AM   #28
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Thanks Lewster. Sounds like the todo list is getting longer :-)

Lifeline batteries, new converter, and solar panels. Now if only I could find someone in Boulder, CO who can help me with all that...
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