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Old 05-02-2017, 01:50 PM   #1
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Converter Charger Question

My 2005 Journey is equipped with a Parralax 7455T, 13.6VDC, 55 Amp converter charger that has seen better days. Output now barely keeps up with DC demands when plugged into shore power afnd has oittle or no capacity to charge house batteries. I've been limping along on the last few trips with an external trickle charger (2 amps) that help keep the house batteries up to snuff. Time to replace it with a new unit with multistage charging capacity.

My question is should I just stick with a 55 amp unit that meets the OEM spec or can I/should I consider a higher amp unit? Any particular preference on units?

PS: house batteries are new AGM deep cycle and I don't really need an inverter type unit.
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Old 05-02-2017, 02:21 PM   #2
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You need to see if the wiring to/from the converter is sized appropriately for a larger unit.
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Old 05-02-2017, 02:29 PM   #3
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I have a Progressive Dynamics 4655 coming in the mail to replace my Parallax battery cooker. It gets good reviews and is a drop-in replacement.
55 amps should be plenty. Unless you have unusually high loads that is all you'll need.
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Old 05-02-2017, 02:33 PM   #4
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As mentioned, wire size, to the converter and and how many charging amps your batteries can handle.

AGMs are happy around 25% of AH capacity. With 200 AH of battery a 55 amp charger is all you want.

You can charge them at a higher rate but you need to keep an eye on the battery temp, while charging.

If you don't cycle them too deep, it won't matter what size charger you use. The charger will go into constant voltage mode and the amps will taper off.
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Old 05-02-2017, 02:34 PM   #5
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Our old '93 Airstream came with a 55 amp and when it died I put a 65 amp in and it worked great. I kept it plugged in all the time it was stored and we only go out maybe 2 months a year in total. The batteries were still holding well after 10 years, so I would guess it did the job. The wiring was never a problem.
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Old 05-02-2017, 03:55 PM   #6
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Thanks everybody. I should have mentioned I'll need a deck mount, enclosed & fan cooled unit. Parralax, WFCO & Powermax all have 55 amp replacement units with 3-4 stage charging.

PS: iooks like I have #8 wiring from the converter to the main bus.
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Old 05-02-2017, 04:28 PM   #7
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Originally Posted by dwfisk View Post
Thanks everybody. I should have mentioned I'll need a deck mount, enclosed & fan cooled unit. Parralax, WFCO & Powermax all have 55 amp replacement units with 3-4 stage charging.

PS: iooks like I have #8 wiring from the converter to the main bus.
If your not going inverter charger go to a progressive dynamics model with a charge wizard.
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Old 05-02-2017, 04:43 PM   #8
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Progressive Dynamics! By the way, I would check or replace the charger to battery wiring on an older unit. At least check the ground bolt connection to frame for corrosion. Replace w/ 2/0 wire. Might make for a big improvement.
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