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Upgrades or replaces the converter section for 55-amp Parallax/Magnetek, WFCO, or Parallax RV power centers. Works with Parallax/Magnetek model 6355, WFCO model 8955, and Parallax models 7355, 7155, and 8355.
Features:
Specs:
Alternate Instructions
California residents: click here
I watched all videos I could find before attempting this job. After finishing I plug into 110 volt outlet my lithium battery was at 25% charge ( I had relocated the white cap over the lithium indicator as directed in video) my battery is blue tooth the green indicator light on the distribution panel was on no blinking. Battery showed 13.5 volts charging amps at 6.The battery is a 300ah showed that rate the 55 amp charger would take 94 hrs does this sound right?
Charged my 300 aH LiPO4 battery like a champ and then appropriately dropped to trickle charge levels. Very satisfied.
This was a direct replacement for the panel which came with the airstream but had the added feature of allowing me to charge Lithium Battery.
I bought this so that I could charge a lithium battery instead of lead acid. Several years ago, I bought a PD4655 as an upgrade from a WFCO-8955PEC and it worked well, so I am hoping for the same result this time (although I wish there was just a simple upgrade fix as the parts are very similar between PD4655 and PD4655V, or at least a recycle option). The metal case has to be removed (4 small screws; likewise would be cool if there was a recycle option as I don't have a use for the case). You also have to move the jumper to the lithium side instead of the wizard side on the motherboard, but that's a simple lift and move of the jumper to one pin over. Just received today and look forward to a relatively straightforward install this weekend. Received a day earlier than expected, so happy with that too.
I purchased this replacement converter from etrailer.com to convert my travel trailer from lead acid to lithium batteries. Though I'm not an electrician, it was a fairly easy install with the help of the included instructions. The unit is easily changeable from FLA to lithium, and visa versa, simply by moving a little jumper on the board. I used it on several long Rv trips during the summer of 2025 and it worked perfectly. Also, many thanks to etrailer.com for steering me toward this part, away from a different part this I was originally looking at.
I called the etrailer on line # to make a change in my order for a converter. I explained the issue and Sienna took action to cancel my original order and place a new order. Sienna also took the time to verify exactly what was in my order. Once verified my order was immediately shipped and I received the right converter in two days
Purchased this unit and it was a lifesaver. My camper was fuses and was overcharging the battery which killed two batteries. Figured the unit in my camper was bad so ordered one from here. Delivery was fast and came with detailed instructions. Took less than an hour to replace the whole unit. Plug camper in turned everything on and all is well. Will definitely come here again for any of my RV needs
The PD product replaced the original Airstream (20 yrs old) Converter/charger. Install was fairly easy except the old 12 wires sizes did not fit into the new PCB clamps without a lot of force. Also, delivery was a day late even though I paid for rapid service (I live in downeast Maine - nothing comes on time). Powered up and it worked first try. Happy with PD's product!
Seems to be a better upgraded replacement as I went to Lithium LifePO4 batteries. Easy install except bracket didn't line uo to existing holes so I had to modify bit, nothing hard.
Our power distribution panel came on Friday just as you said it would. It is already installed and working properly. Thank you! We will shop with you again.
Perfect replacement. Now my batteries c harge!
Jim
8/26/2025
excellent. I dont even think about it, so that must mean it is working flawless. We were on our winter 5 month trip using it every day.
This was an easy install for upgrade to lithium batteries.
Perfect replacement and was an upgrade.
The controller arrived two days after the order was placed. Packaging was excellent. Had it installed the day after it arrived. Directions were clear making the install very doable. Took about an hour and a half. The previous controller failed while we were travelling. The new one works perfectly. We can now use our small travel trailer with no worries. Progressive Dynamics produces quality products. Etrailer is very professional and effective. Highly recommend both of them.
I called in for product support and received none. I was referred to the Manufacturer which wasnt a walk in the park.
Works great for both lead acid and my upgrade to lithium. Exact swap to the old wiring. Very nice fit
When the charger on the original converter failed I wanted to replace it with a USA made converter. I am glad I did. The Progressive converter fit perfectly and is built much more solid. It has performed perfectly in the year we have been using it.
Brooke M.
2/13/2025
Im glad to hear you are so happy with this panel! Are you fixing up the RV for an upcoming trip?
I would like to thank etrailer.com for my RV converter. It was very easy to find on their web page had all the information I needed to order it and install it.The directions were easy to figure out and had it in and running in about an hour
Thank you
Ansley J, did an outstanding job finding the proper converter I needed and placing my order. It arrived on time and it was very easy to install. I plugged in my RV and the converter started charging my lithium batteries. I highly recommend this converter and etrailer for outstanding customer service.
Great service easy finding the replacem ent.
The converter matched up perfectly
Slipped right in and was very easy to install... definitely can't beat the price....way better than any other quote that I received
Brooke M.
5/9/2025
We mean business, that's for sure ;)
Warning! On recent (2021 and later) models of trailers this is not a drop-in replacement. The newer WFCO 8955s are no longer installed in a metal box, they are using molded plastic boxes now. The PD4655's box does not fit where the old converter electronics go. Since I do not want to replace the entire electrical panel I'm having to remove the PD4655's electronics from the metal box and figure out some way to safely mount it inside the plastic cavity.
Heather A.
10/10/2024
You are correct, the WFCO 8955 is in a molded plastic box. You will need to remove the new converter core assembly from provided enclosure, by removing (4) screws securing converter to enclosure and slide converter out. Discard the metal enclosure and screws as they are not used when replacing this model converter. Then you can replace the unit inside your original box.
Like usual, etrailer.com did an awesome job. My items always come quicker than what they say it will. That's why I always come back.
Product worked great, no issues. Fast and easy installation.
Replaced 12 year old converter section of Parallax 7355 Power Center. Positive lead wire from PD converter to existing DC circuit board barely long enough. Had intended to use the PD DC circuit board that came with the converter, but didn't because the wiring of the Parallax board was quite different (i.e., PD board had screw-down attachment of positive circuit leads, whereas the Parallax had pigtails soldered to the board that came from a compartment in the rear of the power center (which I would have had to completely remove in order to see what was really going on)). PD's installation instructions were barely adequate (for example, installation of the new DC board was barely mentioned - and its installation instructions were included in the de-installation instructions for the Parallax converter!). The Phillip's heads on the 4 machine screws that came with the unit stripped out with just manual screwdriver effort.
Overall, though, it worked the first time I plugged in shore power, and also when I ran my generator. I will need to use it for a season to tell if it charges my new house batteries better than the old Parallax.
On the positive side, etrailer's web site was easy to use and the product came in its original, un-opened packaging in a timely fashion during the busy pre-Christmas season. I also like the amount of information etrailer provides on the products it distributes.
Info for this part was:
At etrailer we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time.
Lazer S.
11/18/2025
Hi John! It sounds like you may need to switch the converter to Lithium mode. You should be seeing around 14.2 to 14.6 volts to actually charge the battery. The 13.5 would really only maintain the battery. Check out the link I have included as it will show the switch. What brand and model did you replace?
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