Best Converter Upgrade For WFCO 8935 With Lithium Batteries

Updated 03/19/2026 | Published 03/12/2026

Products Featured in This Question

Replacement Section for AC/DC Power Distribution Panel - 35 Amp

(110)

$283.00

Question:

Hello! I have a 2022 travel trailer with the WFCO WF-8935-AD power center. I have switched to Lifep04 batteries, and while I was able to get the unit to detect and use the lithium charging profile, the charge output is extremely poor - averaging 8-10 amps as viewed through my Victron shunt. I cannot seem to find what the max charge output for lithium is for the Progressive Dynamics PD4635V replacement converter charger is, if it will appreciably improve my charging output - or if I need to look at some other separate way to charge my batteries. I would only look to replace the current converter for faster charging. thank you!

asked by: Jason D

Expert Reply:

Hello Jason, thanks for reaching out. The low charge rate you are seeing is pretty typical with the WFCO WF-8935-AD when used with lithium batteries. The Progressive Dynamics replacement section # PD4635V is a much better match for a lithium setup. It is a 35 amp converter and in lithium mode it charges at about 14.6 volts, which allows it to deliver close to its full output when the batteries are low. That means you can see a significant increase in charging speed compared to the WFCO unit.

The PD4635V is designed as a direct replacement for the WFCO 8935 power center section, so installation is straightforward and keeps your existing distribution panel in place.

What kind of camper do you have? Any cool trips planned for this season?

expert reply by: Jesse M

Steve H.

3/17/2026

Amp meter show current draw. If batteries are only drawing X amps that’s what they’re drawing at that voltage, not what charger is capable of. just because the power supply has the amperage capacity , doesn’t mean you’re using all of it. As battery voltage comes up it will draw less amps as voltage equalizes. the way to charge a battery faster is at higher input voltage but I would guess the battery management in the battery is regulating how fast it can safely charge based on battery's internal temperature

Mitch

3/17/2026

In my 2003 camper, I replaced my old Trojan lead acid batteries with new LiFePO4 batteries. I needed to purchase this plug and play (kinda) power section to obtain the correct charge voltage for the new LiFePO4 batteries (14.6v). Old charger was charging at 13.6V max, if I recall correctly. New batteries would have never fully charged at this lower charge voltage. This replacement charger produces 14.6V constantly and does not go to a “float” voltage like the conventional Non-LiFePo4 chargers. The BMS (battery management system) within the new batteries control the charging amperage and will stop taking any charge current once they are 100% charged. I also use solar charging and will go weeks and sometimes months without shore power. I have learned however, that you must fully charge the LiFePo4 batteries regularly (weekly if possible), by whatever means (shore power or solar, or gen) or cell balance becomes an issue and these new LiFePO4 batteries will start to do some funky things and give false Status of charge reporting within the App.

Jesse M.

3/18/2026

@Mitch Thanks for sharing that, Mitch. Sounds like you’ve got your setup dialed in and you’re getting the most out of those LiFePO4 batteries. That’s a great tip on keeping them fully topped off regularly too, a lot of folks don’t realize how important that is for balance and accurate readings. This is great real-world feedback. Appreciate you taking the time to pass that along.