Do I Need to Replace the Fuse Panel When Installing a PD4655V for Lithium Batteries?

Updated 06/10/2026 | Published 06/09/2026

Question:

I am replacing the parralax power center 7155 converter to the PD4655V. I am installing lithium iron phosphate battery and was wondering if I need to replace the fuse panel that has the wizard button on it that comes with the PD4655V or not for a lithium setup. Do I need to replace that? It doesnt matter if I need to or not im just wondering if I needed to or if the lithium setup doesnt require it then I can omit that from the install. I appreciate your time and response.

asked by: Nick

Converter Charger Information
(click to enlarge)

Expert Reply:

Hello Nick,

Thanks for writing in.

Yes, you do need to replace the fuse panel section that comes with the # PD4655V, even when you're installing lithium batteries.

The fuse board isn't just there for the Charge Wizard button. The replacement assembly included with the # PD4655V contains the converter electronics and the circuitry that allows the Charge Wizard and lithium charging functions to communicate with the converter (I attached an image showing the wire connecting the 2). When Progressive Dynamics designed the # PD4655V as a replacement for the Parallax 7155, they intended for the entire replacement section to be installed as a unit rather than reusing the original Parallax fuse panel components.

The good news is that once it's installed, you can use the Charge Wizard button to place the converter into Lithium Mode when charging your LiFePO4 battery bank. The converter will then provide the proper charging profile for lithium batteries. If you leave the original Parallax fuse panel section in place, you may not have access to all of the functionality that makes the # PD4655V lithium compatible.

Since you're already doing the upgrade and have the new assembly, I'd go ahead and install the complete # PD4655V replacement section as Progressive Dynamics intended. That way you'll know everything is wired correctly and you'll get the full benefit of the lithium charging features.

What kind of RV is this in, and what adventure are you looking most forward to this summer?

expert reply by: Kate F

Converter and Fuse Panel
(click to enlarge)

Nick

6/10/2026

This is actually for my dad's rv, im just trying to help him decide which unit he needs. I appreciate your help. Additionally, how many input watts does this unit use for lithium?

Kate F.

6/10/2026

@Nick My pleasure Nick! The # PD4655V is a great choice because it will work with both traditional lead-acid batteries and LiFePO4 batteries. If your dad decides to go lithium now or down the road, the converter has a built-in lithium charging mode, so he's covered either way. As far as power consumption goes, the # PD4655V can put out up to 55 amps of charging current. At full output in lithium mode, you're looking at roughly 800 watts going to the battery bank. Since the converter isn't 100% efficient, it'll pull a little more than that from shore power. The actual amount it draws will vary depending on how low the batteries are and how hard the converter is working to recharge them. The good news is that it won't sit there drawing maximum power all the time. As the batteries charge up, the converter automatically tapers the charging current, so power consumption drops off as the batteries get closer to full.