Which Replacement Converter Section for Magnetek 6345

Updated 05/26/2026 | Published 05/19/2026

Question:

I currently have an aging B+W Power converter 6345. I believe it is also under the Magnetics brand. It looks like the Progressive Dynamics PD4645 will work. My question is, would the more powerful PD4655 work OK. It seems to have the same dimensions. Will the DC board work as well. They look the same. I believe my 45 Amp is marginal at best. Thanks for your input.

asked by: Terry R

Expert Reply:

Hey Terry, I know it's tempting to go up in amperage when replacing your converter section but the problem is that the wiring of your setup is probably not rated for the additional amperage so you would be going from a super easy and simple replacement with the part # PD4645V to having to go over the wiring and make sure everything could handle the additional amperage. What batteries do you have?

expert reply by: Jameson C

Terry R.

5/22/2026

I have lead Acid now. I would be using the same fuses on my current setup. That’s what is important. I just wondered if it would fit. It looks like it. Is the dc fuse board the same? I just like to have a little extra if I want To add a circuit later.

Mark T.

5/22/2026

@TerryR - The problem is not the individual circuit fuses. There is no "fuse" in the panel for the battery charge circuit so you must have battery charge-connection wiring rated for at least 55 amps. There's a good chance your older 45 amp unit does not have a large enough wire gauge to safely handle the 55 amps the larger unit puts out. That's why I stayed with the 45 amp unit. (I would have needed a new larger circuit breaker at the batteries and a larger gauge wire run between the power center and the batteries which is a big job on my rig)

Jameson C.

5/26/2026

@MarkT thanks for sharing that!

Stephen

5/23/2026

Hi Terry, I purchased and installed my 4600 series in 2023. I have a 19' Forest River travel trailer. The old unit buzzed like a swarm of bees and put off a lot of heat and cooked batteries like it was a chef. This was a snap to install. I am extremely pleased with my unit. I basically keep my trailer plugged into power 24/7, 365. I have had absolutely no trouble with this unit. Keeps the battery charged properly. I rate this unit 10 out of 10. Stephen