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Old 01-10-2007, 10:27 PM   #29
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Originally Posted by 85Sovereign
Looks like I'm gonna get the oppurtunity to buy 2 new batteries along with my new converter and meter. I'm gonna try and fit the size 31's in my trailer.

Greg
Greg, no way you'll stuff 31's in your battery compartments, even with Vasaline and a shoehorn. They are just to long. Lifeline 31's under the couch is another story though. I'd stick with a couple new grp. 27's in your current boxes.
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Old 01-10-2007, 11:13 PM   #30
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I really admire Greg's determination but I'm afraid it's fruitless with an Airstream Trailer without serious modifications but it can be done and I have a hunch he is on a mission... We deal with the ultimate battery set-ups every day and the battery bank is very limited in Airstream trailers. A pair of Group 27 is about 210 AH, give or take. There is just no room left over for weight carrying capacity on the tongue.
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Old 01-11-2007, 06:16 AM   #31
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Based on the measurements I took, I think they will fit. But, the top posts on the 31's will have to me changed to a shorter one. The rep at the battery store advised that he can remove the top posts and replace them with a much shorter one. I did try to stuff a 31 in last night. The width was good as well as the height execpt for the top posts. But could not tell on the length. I'll get the posts changed today and let you know if it is a good fit.

Greg
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Old 01-12-2007, 08:47 PM   #32
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Give us an update on that Greg when you can. I honestly didn't think you would have success stuffing 31s in the 85 Sov. battery compartments but I'd like to be wrong in this case so people can follow suit. There's a few more AH to be had but not to much. I know your scrounging for every possible AH available. I still think it will be a chore to get them in and out to check the water but you have the ball now as I don't have any 31's in the warehouse right now to try it. 31s are just not a popular size.
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Old 01-12-2007, 10:06 PM   #33
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Well, I borrowed a size 31 from the battery store. It has the finished height my Trojan's will have after the top posts are cut off and rewelded to be shorter. And, it fit like a glove!! The 31 has about the same width and height as the 27s'. Don't get me wrong, there was hardly any room left in that battery box. But still, the 31's will fit and the door to the battery box would even close shut. I went back to the battery store today to get the real Trojan batteries, but because of the ice storm that hit OKC today, they were closed. So, it will be next tuesday at the earliest, before I can comment on the actual install.

Greg
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Old 01-13-2007, 11:52 AM   #34
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While most 27's and 31's may have the same width and heigth, I have found numerous differences in their lengths and that is why I previously stated that a 31 would not fit your compartment (lengthwise). I guess your compartment must be slightly longer than mine.
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Old 01-13-2007, 12:45 PM   #35
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I don't know if my boxes are any bigger. That size 31 took up every bit of the box and then some. I was able to close the door to the battery box compartment. But, about .25"s' of the battery came to rest on the lip of the frame work behind the door. The door and the battery did not touch after the door was closed.

By adding these 31's have I added to much weight to the tounge?

Greg
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Old 01-21-2007, 07:53 PM   #36
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Well, I finally got everything installed, including the trimetric meter. Randy, at Best converter was very helpful with any questions I had. After everything was installed I used the new meter to measure any draw from my batteries with everything turned off. The new meter only read .2 amps. I firgure this is an acceptable measurement of loss from the 2 new batteries (31's). I was also able to measure the amperage draw of various electrical devices in the TT. If your going to replace your old Univolt I recommend getting the Trimetric meter as well. It is a handy tool. Thanks again to Randy.

Greg
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Old 01-22-2007, 08:24 AM   #37
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Greg, since your battery is not sitting level in the compartment because it is sitting on the front ledge, keep an eye on it to make sure that it doesn't crack the front lip or the back of the battery box where the battery makes contact.
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Old 01-22-2007, 02:58 PM   #38
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Roger that. I installed some 3/4" shimms under the battery boxes to help support them. I checked with the battery store about the batteries sitting on that lip. They advised that it should not hurt them. There only concern was that the battery case could rub on the back of the battery box door. Like you, I was concerned that there might be some kind of structual failure of the battery case iteself from not resting flat. But, I will keep an eye on that water level.

Is the .2 amps that my meter is regestering an acceptable amount to be drawn from the batteries when everything except the meter is turned off?

Greg
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Old 01-22-2007, 09:54 PM   #39
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Phantom draw

I'll let someone else on the forum try this one since I can't seem to pull up my source of phantom loads. I was thinking that the refrigerator draws .33 or so amps per hour. Any radio with a display or your LPG detector might be drawing that .2 amps.
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Old 01-23-2007, 09:49 AM   #40
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Well, I have everything turned off, including the fridge. Would the Trimetric meter pull the .2 amps?

Greg
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Old 01-23-2007, 10:49 AM   #41
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Greg, The meter itself draws .31 when the display is on. If you turn it off, it drops to .15-.16. Thats not much and obviously it has to power itself but I'd keep searching for a parasitic load if you are seeing .2. That is 200 mA with the 500 amp shunt The only other thing on the installation is to make sure the G1 and G2 connections are tight on the shunt.
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Old 01-23-2007, 02:54 PM   #42
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I guess the sure way to check for a parasitic load is to pull the fuses out one at a time and see if I can isolate the mystery load.

Randy, You advise that the meter draws .31 when it is on. Is this the ".2 amps" I'm reading because my meter is on? What would be the best way to measure any mystery load if everything, including the meter is turned off?

Is the .2 amps an acceptable amout of loss if I can't track down the loss?

Greg
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