progressive dynamics power converter Model PD6921 - Fiberglass RV


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Old 09-30-2020, 05:11 PM   #1
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Name: Susan
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progressive dynamics power converter Model PD6921

Hi folks - my new-to-me 1979 Trillium 4500 has a progressive dynamics power converter Model PD6921. I think that it has been damaged: see picture. The small square to the left of the plug (reads "green band means off/push on/pull off) seems broken to me. Anybody seen this before? Can it be fixed? Can I keep using this, or must it be replaced? Thanks!
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Old 09-30-2020, 05:35 PM   #2
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Originally Posted by SusanP View Post
Hi folks - my new-to-me 1979 Trillium 4500 has a progressive dynamics power converter Model PD6921. I think that it has been damaged: see picture. The small square to the left of the plug (reads "green band means off/push on/pull off) seems broken to me. Anybody seen this before? Can it be fixed? Can I keep using this, or must it be replaced? Thanks!


I suspect that is the 120V circuit breaker and the top has been broken off. The good news is that it can likely be replaced. UHaul used similar devices. These are similar to what are used on small airplanes. Search for 10 A push button reset circuit breaker on Amazon and compare pictures to see if compatible. You will have to take the cover off so make sure that you unplug everything.
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Old 09-30-2020, 05:59 PM   #3
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Hi Mike - thanks for commenting. There is a button on the right-hand side that reads "12 volt output," a min-breaker. It seems to work fine. Like you, I also think something has broken off the button on the left-hand side. I'll be sad if I have to replace the whole unit because of that!
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Old 09-30-2020, 06:41 PM   #4
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See this thread: https://www.fiberglassrv.com/forums/...ter-51997.html

It appears that it is a single stage charger.. if it is, and if it were me, I would surely replace it with a modern multi-stage charger / converter.. even if it was not broken.
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Old 09-30-2020, 07:46 PM   #5
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Trillium 4500 converter charger

(EDIT: I am surprised your converter works at all. Definitely don't use it to charge a battery.)

I have this same unit on my Trillium 4500. The problem with replacing the original converter with a modern one is that there is very little space in that location, less than 4" depth. I found one solution that fits, the Parallax 80D Distribution Panel with a separate converter charger such as a Progressive Dynamics PD9245C converter charger to be located in adjacent space.

Another option is to relocate everything to the adjacent space where the shore power cord is stored. This would give you the option of other converters. Either way, you would also want to upgrade to 30 amp shore power. This would also allow you to have at least two AC branch circuits instead of one, a great benefit if you run more than one high amperage AC appliance.

I plan to upgrade at some point, but meanwhile I have replaced the AC push button circuit breaker with a 15 amp push button circuit breaker. Why? Because it protects the (EDIT: the wiring for the) entire power load in this unit including:

- FOUR AC outlets (one on the converter, two others inside the camper, one in the fridge cabinet)
- The AC/DC transformer providing power to DC circuits (several lights)

I also replaced the DC push button circuit breaker with a 10 amp push button circuit breaker. Also replaced the toggle switch. Also replaced the transformer with a 15 amp 12 VDC power supply. I use a separate smart charger to charge the battery.
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Old 10-01-2020, 08:44 AM   #6
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IMO, those old power centers were garbage, and get worse with age. Start looking for a replacement. With my 1300, there was plenty of room. But others report limited space in the 4500. Time for research.

I went with a 30A system.
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Old 10-01-2020, 10:06 AM   #7
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Know what you need!

We also have an old 4500, and had the same problem.

Since we do NOT have air conditioning or onboard batteries, I just went to a local electronics supply store and bought the closest replacement piece that I could find. Works great and just cost a few bucks.

If you don't need it, I would not recommend upgrading. If you are going to install batteries and/or air conditioning, then it probably would be a good idea.
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Old 10-01-2020, 01:13 PM   #8
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The original PD6921 is strictly for your 12VDC lights. It is not a battery charger. If you try to use it for that you will boil your battery dry. In fact, if hooked up correctly, it only connects to the battery as an alternative 12VDC source, when no 120VDC is available.

My favorite replacement would be a Progressive Dynamics 4600:
https://www.progressivedyn.com/rv/po...r-4600-series/
This is meant as an upgrade for older power centers, but can be adapted to the hole for the PD6920, as in this post:
https://www.fiberglassrv.com/forums/...tml#post325467
I like the use of the cold air return duct cover.

It comes with a DC distribution/fuse board, (see picture) which you can plug in the . This would need some mounting hardware to make it a finished product like this:
https://www.progressivedyn.com/rv/ac...ibution-panel/
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