Replacement Lithium Compatible Converter for a WFCO 8735

Updated 09/25/2025 | Published 09/24/2025

Question:

Hello. I currently have a WFCO 8735 converter in my travel trailer. I am looking at upgrading to something that is lithium ready. Can you please tell me which model I need to upgrade to? Thanks in advance

asked by: Lance C

Expert Reply:

Hey Lance, thanks for the information! I don't have just a lithium compatible replacement converter for your WFCO 8735. The best solution I have is the Progressive Dynamics Mini Panel item # PD4045KA. This 45 amp panel will replace everything you currently have and is a similar size so the install won't be too difficult.

How big of a lithium battery setup are you planning on going with and what kind of trailer do you have?

You can add this information and any other questions you have where it says Reply to Jerred H and I'll be happy to answer them.

expert reply by: Jerred H

Progressive Dynamics 4000 Series
(click to enlarge)

Lance R.

9/25/2025

Hi Jerred. First, thanks for replying. I have a 2017 KZ Escape 180G camper. Last year i swapped out the standard battery for 2 6-volt golf cart batteries for a total of 240 amp hours, which in reality is only 120 considering they are lead acid. Still, a step up from the single 12v. We are planning on doing a lot more dry camping starting with next year, so we need to step up our game even though we will have a generator along. Looking at a minimum of a 300ah battery. The battery I'm looking at is a Vatrer 300ah. I'm still poking around for more information, but why wouldn't the WFCO WF-8735-AD work as a converter upgrade? I do see your suggestion is 45 amp whereas the WFCO is only 35. Out of curiosity, the photos of the Progressive show the 12v wires coming out of the unit are NOT color coded. Is there a reason for that?

Jerred H.

9/25/2025

@LanceR You're welcome! We do not carry Vatrer batteries. Our 300 amp hour option would be the Go Power Sun Cycle Advanced Lithium RV Battery item # GP26QR. Comparable features and performance so I am not going to steer you away from the Vatrer. The WFCO WF-8735-AD looks like it would work as an upgrade. We carry Progressive Dynamics, which is higher quality and better for lithium batteries. The item # PD4045KA is going to charge a whole lot faster and be quieter. Battery longevity is better with Progressive Dynamics converters as well. You're definitely going to get you pay for with this purchase. They're not color coded because RV's do not have a universal color coding standard. The item # PD4045KA is designed to replace a few different brands so you'll want to go off of the functions of the wires when installing.