Upgrading converter

Thermoguy wrote:
I apologize for hijacking this thread. I am interested in a possible converter upgrade as well.

First, I have a WFCO WF-8935 - 30AMP, not 55AMP. Trying to decide if I have a battery charging problem or battery problem. I have 2 2year old 6V Duracell batteries. When I put them on an external charger, they charge right up, but aren't holding the charge for long. Using the installed WFCO charger, they never seem to get to full charge status. This is a new problem as I just installed the batteries after winter storage a couple weeks ago. We are getting ready for memorial day weekend and turns out I booked the wrong site with no power or water, not sure how I missed that. But, we have a generator and can top off the batteries, just don't want to do that every day or even try to get away without using the gen if I can.

Question 1. How do I test to see if the converter is working correctly and charging the batteries? I feel like I'm not putting my leads in the right place, only ever getting a little over 12v DC.

Question 2 if I replace the converter, what is a good substitute? Will the PD 4635WV slide right in? Is there a case to go larger? 45 or 55 AMP? If so, what else do you need to change?

Any other suggestions? Not a newby to RV's but have never had to mess with the electrical system other than switching to 6v and finding a disconnected ground which caused my electrical system to not work...

Thanks in advance for any advice. Just an FYI, not switching to LiIon, Not adding solar... etc. What I have works when it's working. We only boondock 3-4 times a year and the gen works fine to recharge the batteries when it works. We try to camp away from other people when we can.

8935 is a 35 amp converter. Probably a 30 amp RV that distributes 30 amps of 120vac.

Less than 13 volts on any converter is shot. May need to check fuses and such depending on where the test leads are connected. OK to remove and bench test. Probably not going back in anyway.

The most direct replacement would be the PowerMax MBA 35 amp.
https://powermaxconverters.com/product/pm3-mba/