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Old 10-13-2011, 08:26 PM   #15
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Question Powermax 7455??

Quote:
Originally Posted by Olie View Post
I recently replaced two 4 year old blue tops with D27's. My feeling is my Powermax 7455 converter fried them. Does anyone know if the Powermax 7455 is a 3 stage charger?

Also, as the D27 is a wet cell I'll have to vent the battery compartment. I planed to cut about a 3"x 4" hole in each battery compartment door and install a stainless steel grill over the hole. I have not been able to find a grill here in SE Texas. Does anyone know where I might find one?
Olie,

Parallax 7455?

If this is the converter you have, then yes it will overcharge your batteries if left plugged after the batt's have gotten a full charge.

It ruined ours on the dealer lot when left on for 24hrs.

The battery box's on the Classic are vented.

I switched to an IOTA DLS 55 IQ4, very easy install on the Classic,
Highly recommend it for AGM's, especially the Optima's.

Bob
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Old 10-13-2011, 09:57 PM   #16
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AGM issues..........

WOW.......input and ideas abound.....for a novice like me however, result is a bit more confusion then clarity. Did hear back form the mother ship/Jackson OH that they use lifelines for AGM installs and no additional charger modifications.......specifically,

""Can I use Gel Cell or AGM batteries with my Parallax converter/charger?

Applies to all models.

There are many people using Gel Cell and AGM batteries with our converters/chargers. We do recommend that the battery manufacturers specifications be checked to ensure that the batteries chosen have "float voltage" requirements consistent with the converter output float voltage which is 13.2 - 14.1 VDC.

Our AGM batteries meet these requirements they will work fine with the converter.

Thank you,

Airstream Customer Support Team ""

Thanks to all for your input........on/streamon with the "adventure".
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Old 10-13-2011, 10:01 PM   #17
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Hmmmmmm....I'm not so sure about that....if they are still using th Parallax converter. I don't think too much of it.
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Old 10-14-2011, 05:15 AM   #18
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Thumbs down P-lax

Quote:
Originally Posted by dznf0g View Post
Hmmmmmm....I'm not so sure about that....if they are still using th Parallax converter. I don't think too much of it.

streamon,

What brand/model converter do you have?


I'm a little more than dzn...the P-lax is junk!

Our dealer left the P-lax 7455 plugged in for 24hrs at pre-delivery and it cooked the Interstates. I had to go to the Interstate distributor to have them pro-rated, (not a stocked item at AS drlr),
Even with careful monitoring two years later another pair were junk.

Went to the IOTA and Lifelines, no problems since.

Bob
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Old 10-14-2011, 07:43 AM   #19
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Quote:
Originally Posted by streamon View Post
WOW.......input and ideas abound.....for a novice like me however, result is a bit more confusion then clarity. Did hear back form the mother ship/Jackson OH that they use lifelines for AGM installs and no additional charger modifications.......specifically,

""Can I use Gel Cell or AGM batteries with my Parallax converter/charger?

Applies to all models.

There are many people using Gel Cell and AGM batteries with our converters/chargers. We do recommend that the battery manufacturers specifications be checked to ensure that the batteries chosen have "float voltage" requirements consistent with the converter output float voltage which is 13.2 - 14.1 VDC.

Our AGM batteries meet these requirements they will work fine with the converter.

Thank you,

Airstream Customer Support Team ""

Thanks to all for your input........on/streamon with the "adventure".
I'm afraid that the 'Mother Ship' is a bit behind the curve on this topic. First, I don't know of any manufacturer that still makes 'gel cells', as they are simply liquid lead acid batteries with a gelling agent added to the acid. They are very susceptible to improper charging and once the gel delaminates from the plates, they exhibit a reduced charging capacity from these 'hot spots. They are also not very good in vibrational uses, like bumping down the road in a trailer.

Next, float voltage is fairly specific for each battery brand and is usually specified in their charging requirements. Float voltage IS NOT a range between '13.2-14.1 VDC'. Lifelines require a specific float voltage of 13.2VDC. If you float them beyond this number, you will cook them! And the Lifeline requirement for bulk/absorption charging is 14.2 VDC.

The P/lax converter is a single stage unit that emits a constant voltage, this is why if you leave it connected to your batteries, they will fry! Don't believe me, try it for an extended period and see what happens. Thee are many examples of that experience posted in these forums.

Use of the Parallax unit by Airstream is another cost-driven decision, not one of quality. That is obvious when there are far superior units available for proper battery charging!!
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Old 10-14-2011, 07:50 AM   #20
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You may want to consider the Universal brand as an alternative to Lifeline. They are a little cheaper and depending who you talk to as good if not better than Lifeline. Available from Randy at Best Converter in Boise who also ships for free. They are Chinese which is a turn off for some folks.
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Old 10-14-2011, 08:29 AM   #21
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When doing the reno of my 65 Safari I installed a Progressive Dynamics 9245 converter and 3 group 27 Lifelines. Very happy with the arrangement. Can go 4 to 5 days boondocking before gen. is used.
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Old 10-14-2011, 11:17 AM   #22
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Quote:
Originally Posted by Lumatic View Post
You may want to consider the Universal brand as an alternative to Lifeline. They are a little cheaper and depending who you talk to as good if not better than Lifeline. Available from Randy at Best Converter in Boise who also ships for free. They are Chinese which is a turn off for some folks.
I've seen both opened, and the Universal is not as well constructed as the Lifeline, especially in the area of plate separators and insulators.

DON'T COMPLAIN ABOUT THE ECONOMY, LOSS OF U.S. JOBS AND THE GENERAL STATE OF WELL BEING IN THIS COUNTRY IF YOU WILLINGLY BUY A CHINESE PRODUCT THAT IS 'A LITTLE CHEAPER' WHEN A BETTER, U.S. MADE PRODUCT EXISTS !!!! KEEP SENDING THOSE U.S JOBS AND DOLLARS OUT OF THE COUNTRY AND YOU WILL BE OUT OF A JOB SOON TOO.
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Old 10-14-2011, 11:45 AM   #23
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Agree, but it is becoming increasingly difficult to determine origin of products. We need increased enforcement/info on labeling for everything including food, so that we can be informed consumers.
Just because it has a familiar brand name, does not mean it is North America made.
Dave

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I've seen both opened, and the Universal is not as well constructed as the Lifeline, especially in the area of plate separators and insulators.

DON'T COMPLAIN ABOUT THE ECONOMY, LOSS OF U.S. JOBS AND THE GENERAL STATE OF WELL BEING IN THIS COUNTRY IF YOU WILLINGLY BUY A CHINESE PRODUCT THAT IS 'A LITTLE CHEAPER' WHEN A BETTER, U.S. MADE PRODUCT EXISTS !!!! KEEP SENDING THOSE U.S JOBS AND DOLLARS OUT OF THE COUNTRY AND YOU WILL BE OUT OF A JOB SOON TOO.
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Old 10-14-2011, 12:00 PM   #24
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The tag on the converter reads Powermax Series 7400 Model 7455. Is this the same as a Parallax?

I have two plastic battery boxes under the couch which are sealed to the inside.The access doors outside are solid with no vent holes. The doors are not sealed with a gasket or anything so the boxes are not perfictly sealed to the outside. Are you saying this is enough ventilation?
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Old 10-14-2011, 12:37 PM   #25
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Quote:
Originally Posted by Olie View Post
The tag on the converter reads Powermax Series 7400 Model 7455. Is this the same as a Parallax?

I have two plastic battery boxes under the couch which are sealed to the inside.The access doors outside are solid with no vent holes. The doors are not sealed with a gasket or anything so the boxes are not perfictly sealed to the outside. Are you saying this is enough ventilation?
Do you not have vents in the lower door FRAME? Mine are rectangular, about 1" long. There are 2 in each battery door frame.

Yes, I believe that is the same Parallax 7455 that was in my unit.
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Old 10-14-2011, 01:49 PM   #26
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Battery Door Vents

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Originally Posted by dznf0g View Post
Do you not have vents in the lower door FRAME? Mine are rectangular, about 1" long. There are 2 in each battery door frame.

Yes, I believe that is the same Parallax 7455 that was in my unit.


I don't find any vents anywhere. The doors would be an obvious place to have them but there are none.

Are your vents part of the door or are they a small grill that can be removed? If they can be replaced I could probably order them from AS.
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Old 10-14-2011, 05:01 PM   #27
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they are a notch in the door frame. wasps have no trouble getting in :-)
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Old 10-14-2011, 05:15 PM   #28
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It is true the Parallax 7455 voltage output (13.8 - 14.0) is too high for the recommended float charge of Lifeline AGM batteries (13.2 - 13.4).

But referring to my Airstream Owner's Manual, when plugged into shore power you may put the battery disconnect switch in the "store" (off) position to isolate the batteries from the converter. In this position the batteries will not be drained and the converter will not charge the batteries.

So when plugged into shore power you can use the converter as intended to provide all power to the trailer without damaging the batteries. I would think switching the battery disconnect to "store" should be added to your campground setup checklist.

doug k
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