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Open Roads Forum  >  Tech Issues

 > WFCO 55 amp converter operation

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samandtheduck

On The Canada/US Border

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Posted: 09/19/22 04:50pm Link  |  Quote  |  Print  |  Notify Moderator

I have had issues with bad connections and bad batteries in my motorhome and have them all resolved except knowing how this converter should work. It charges a new set of batteries to about 13.6V with no load. When I put a load (2 fantastic fans and a 12V TV) on the batteries the voltage slowly drops to about 12.65V and seems to stay there. If I shut the converter off it drops even further so it is doing something. When the load is shut off it takes about 20 mins for the voltage to get to 13.4V. I think over a longer period it will get to 13.6V. I have a friend who has a progressive dynamics converter and he says when he puts a load on the batteries the voltage drops from 13.3V to 13.2V and never goes lower. Do I have a bad converter or does this type just act like a trickle charger?

JBarca

Radnor, Ohio, USA

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Posted: 09/19/22 06:54pm Link  |  Quote  |  Print  |  Notify Moderator

samandtheduck wrote:

I have had issues with bad connections and bad batteries in my motorhome and have them all resolved except knowing how this converter should work. It charges a new set of batteries to about 13.6V with no load. When I put a load (2 fantastic fans and a 12V TV) on the batteries the voltage slowly drops to about 12.65V and seems to stay there. If I shut the converter off it drops even further so it is doing something. When the load is shut off it takes about 20 mins for the voltage to get to 13.4V. I think over a longer period it will get to 13.6V. I have a friend who has a progressive dynamics converter and he says when he puts a load on the batteries the voltage drops from 13.3V to 13.2V and never goes lower. Do I have a bad converter or does this type just act like a trickle charger?


From my experience with the WFCO's

If your battery voltage drops (as measured at the battery) to 12.65 VDC when the power converter is running, from what I have seen, your converter is bad. With the converter plugged in and connected to the battery, the WFCO should be in float mode (13.25 volts), standard charge (13.65 volts) or boost (14.4 volts) It will switch between those 3 modes pending how drawn down the battery is. Anything down into 12 VDC range, the converter is not working right unless maybe you are over the 55 amp power rating. Which in this case does not sound like you are.

12.7 VDC with the battery at rest (left idle for 8 hours etc) and no loads on the battery, is 100% state of charge for the battery. Your 12.65 volt is the battery at full charge for all practical purposes. The converter is not lifting the voltage up where it should be.

Make sure you do not have some fuse etc between the battery and the converter blown etc, if the volts go back up from 12.65 to 13 plus with no load, then there are no blown fuses etc, just the converter is not working right.

If you have a WFCO 8955 converter, Progressive Dynamics makes a drop in converter that will tie into the existing DC fuses etc of the WFCO
https://www.progressivedyn.com/pd4600-converter/

If you go to Best Converter dot com, they sell the PD converter tweaked for that company to not need the metal case and it have the plastic clips to hold the converter in place. If you get the Wildkat PD 4655L it has the ability to jumper switch to a future lithium battery if you are on lead acid now. https://www.bestconverter.com/4600-series-Upgrade-Kits_c_133.html

They also offer the Wildkat PD 4655 MBA which is for lead acid and not able to upgrade later.


Call Best Converter and ask for Randy. He knows his stuff and I have always had positive outcomes dealing with his company. They are an authorized PD dealer. Some on Amazon are not and those off shore clones will not be warranted.

Hope this helps

John

* This post was edited 09/20/22 07:43am by JBarca *


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CA Traveler

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Posted: 09/19/22 07:02pm Link  |  Quote  |  Print  |  Notify Moderator

WFCO is known to be a very poor charger, basically just a single voltage. Replace it with a good 3 stage charger. For a discharged battery the Bulk stage raises the voltage up to 14.6V, absorb maintains that voltage until the amps start to drop and then float maintains 13.4V. And it maintains that voltage with a load less than it's maximum rating. It can take hours to charge a battery from 85% SOC to 100% SOC because the battery amp draw is very low. This is for flooded batteries, car, AGM, deep cycle.

Note: It's also possible that your charger to battery wiring is unbdersized.


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Bob


time2roll

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Posted: 09/19/22 07:07pm Link  |  Quote  |  Print  |  Notify Moderator

12.65 is a bad converter. Best to swap into a PD or PM.


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pianotuna

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Posted: 09/19/22 08:56pm Link  |  Quote  |  Print  |  Notify Moderator

Replace.

If you intend on using an inverter, consider an inverter/charger.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

BarabooBob

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Posted: 09/19/22 09:06pm Link  |  Quote  |  Print  |  Notify Moderator

The only problem with your WFCO converter is that it is a WFCO. I have only owned 2 TT's but they both came with WFCO converters and neither one worked when new. I changed them out for a Progressive Dynamics.


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ewarnerusa

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Posted: 09/20/22 09:11am Link  |  Quote  |  Print  |  Notify Moderator

samandtheduck wrote:

I have had issues with bad connections and bad batteries in my motorhome and have them all resolved except knowing how this converter should work. It charges a new set of batteries to about 13.6V with no load. When I put a load (2 fantastic fans and a 12V TV) on the batteries the voltage slowly drops to about 12.65V and seems to stay there. If I shut the converter off it drops even further so it is doing something. When the load is shut off it takes about 20 mins for the voltage to get to 13.4V. I think over a longer period it will get to 13.6V. I have a friend who has a progressive dynamics converter and he says when he puts a load on the batteries the voltage drops from 13.3V to 13.2V and never goes lower. Do I have a bad converter or does this type just act like a trickle charger?


Sounds like a bad converter or connection issue. I have the WFCO 55 in my camper and when I switch it on it immediately jumps to 13.6V. I can put all manner of minor 12V loads on it and it won't budge from 13.6V. Minor loads meaning whatever OEM 12V equipment in the camper you want - water pump, lights (all LED in my case), exhaust fans, furnace, etc. I acknowledge that my batteries are usually at a decent SOC so I'm not talking about what happens when my batteries are quite low when turning the converter on.


Aspen Trail 2710BH | 280 watts of solar | 2x 6V GC batteries | 100% LED lighting | 1500W PSW inverter | MicroAir on air con | Yamaha 2400 gen

samandtheduck

On The Canada/US Border

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Joined: 10/24/2004

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Posted: 09/20/22 07:20pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the replies. Batteries were at 13.5 today and I ran some 12V loads and the voltage dropped to 13.1 and I assume would have continued down. I watched it slowly come up to 13.8V and now it is at 13.5V. Not sure what is going on but I have ordered a PD9260 to replace it. I have had one trailer with a single stage converter and one where the converter died and replaced them both with Progressive Dynamics and have had no problems.

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