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Old 10-09-2024, 06:00 PM   #1
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WFCO converter died

My 2021 WFCO 8735 35 amp converter died in my Grand Design and I'm trying to figure out what to replace it with.

My research is telling me that they do not last long, hit or miss, so looking to perhaps go with a different manufacture.

Hoping for something that will fit in the same hole as this one.
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Old 10-10-2024, 05:54 AM   #2
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I would recommend a Progressive Dynamics converter as a replacement. Here is an example of a replacement model for the WFCO #8935.
https://www.progressivedyn.com/pd4600-converter/
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Old 10-10-2024, 08:24 AM   #3
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Quote:
Originally Posted by WhiteGiraffe View Post
My 2021 WFCO 8735 35 amp converter died in my Grand Design and I'm trying to figure out what to replace it with.

My research is telling me that they do not last long, hit or miss, so looking to perhaps go with a different manufacture.

Hoping for something that will fit in the same hole as this one.
I'll second the Progresive dynamics, and I think the one that was recomended was Li capable also which I think is important if you have to replace your converter just incase you want to switch to Li in the future.
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Old 10-10-2024, 03:51 PM   #4
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I will 3rd the PD converters. I replaced the WFCO in our brand new ORV 24RLS before it ever left the driveway.
Your batteries will thank you
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Old 10-10-2024, 05:17 PM   #5
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Looks like the PD 4135K is a direct replacement for my WFCO and it has the lithium battery capability.
I think that is the one I will go with.
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Old 10-17-2024, 04:19 AM   #6
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I added the Charge Wizard Pendant to my PD.
I'm using the Lead Acid charger. PD9260C (1000W) can use PD92201 Converter Status Remote Pendant to set charge mode.

The converter will drop to 13.2v storage mode after 1-2 days. This allows me to run off of solar at 13.6v. It uses top 30% LiFePO4 capacity while dropping to 13.2v at night.
I added another circuit breaker for the converter. It's a handy on/off switch. Converters periodic boost mode tripped CB when using electric heater on the same circuit.
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Old 10-17-2024, 09:46 AM   #7
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As a follow up on this post i ended up talking to Progressive Dynamics tech support and they advised me that model PD4135KW2BV was the correct replacement for my model so that is what I purchased.
I installed it yesterday and the process went pretty well considering the small space between the bed and wall that I had to work in. I labeled all my wires coming from the camper wiring before I started.
It was all straight forward switching them out and it all worked out perfect. Everything works again as it should. The only issue I had is the reverse battery polarity wire was internal on the WFCO model so I wasn't sure where to land it from the new one.
I called tech support and he told me to just tie it off and not use it........not too sure about that answer, but for now that is what I did.
I think I could tie it into any positive 12 volt wire and it should work as it is supposed to.


I'll research more on this.
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Old 10-17-2024, 12:48 PM   #8
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Lithium mode: When the OUTPUT MODE SWITCH is
in the ‘ON’ position, the converter is designed to provide
a constant nominal voltage output of 14.6 VDC.


Wow, that is so bad. 14.6v will shut down some batteries internal BMS.
Also will over charge the battery and reduce life span. At 13.6v they are about 92% charged. I boost charge, via solar, to 14.2v too overcome wire resistance, then float to 13.6v.
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Old 10-17-2024, 03:31 PM   #9
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Quote:
Originally Posted by WhiteGiraffe View Post
It was all straight forward switching them out and it all worked out perfect. Everything works again as it should. The only issue I had is the reverse battery polarity wire was internal on the WFCO model so I wasn't sure where to land it from the new one.
I called tech support and he told me to just tie it off and not use it........not too sure about that answer, but for now that is what I did.
I think I could tie it into any positive 12 volt wire and it should work as it is supposed to.


I'll research more on this.
I think that wire may be the wire to your battery. On the WFCO board the positive from the converter lands on a lug that feeds all the 12V fuses. The battery wire lands on a different lug and feeds the 12V circuit via a pair of reverse polarity fuses.

The thinking is that if you hook up your battery backwards, the reverse polarity fuses will blow and protect the converter and the 12V circuits in the trailer. The reverse polarity fuses are built into the new converter so the ones on the circuit panel are redundant.

I'm thinking that you won't get any battery power when the converter is off if you don't hook that wire in.
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Old 10-21-2024, 07:48 PM   #10
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Quote:
Originally Posted by TacomaJoe View Post
I think that wire may be the wire to your battery. On the WFCO board the positive from the converter lands on a lug that feeds all the 12V fuses. The battery wire lands on a different lug and feeds the 12V circuit via a pair of reverse polarity fuses.

The thinking is that if you hook up your battery backwards, the reverse polarity fuses will blow and protect the converter and the 12V circuits in the trailer. The reverse polarity fuses are built into the new converter so the ones on the circuit panel are redundant.

I'm thinking that you won't get any battery power when the converter is off if you don't hook that wire in.
Nice explanation
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