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Old 02-17-2011, 08:12 PM   #1
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WFCO Converter Battery Charging

Our trailer has the WFCO 8955 Converter/Charger. It a 3-stage charger with bulk, absorption, and float modes; 14.4V, 13.6V, and 13.2V respectively. The manual says that it will go into Bulk mode charge if it senses that the battery voltage falls below 12.2V (Approx 40 to 50% discharge) We boondock quite a bit and have seen our voltage drop below 12.2 on occasion (as measured by a Voltminder hooked into the charger buss). When the battery gets low, we plug the shore power into our EU2000i. I have NEVER seen our 8955 go into Bulk mode. How about you?
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Old 02-17-2011, 08:27 PM   #2
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How far below 12.2 does it drop? It could be similar to a trucks RPM gauge which is about 300 RPM off.
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Old 02-17-2011, 09:17 PM   #3
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I have never seen 14.4 unless I have my battery charger hooked up.

I never let my battery get below 75% capacity (easy to do with the TM-2025 to help monitor capacity) without firing up the Yamaha to get it back above 85% so the WFCO never goes into bulk.
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Old 02-17-2011, 10:51 PM   #4
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I also have a WFCO converter and was told by alot of people it is almost impossible to get them to charge in bulk mode and if it does go in to high charge mode it wont stay there long. Something about the battery current and size of wire going to the batts from the converter being to small causing to much voltage drop.
If you figure it out let me know also.
Thanks
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Old 02-18-2011, 07:17 AM   #5
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That may very well be true, although my 10 amp stand alone charger will crank up to 14.4 volts to cram in the last 5% of capacity to top off when I am using the stand alone charger to restore my house batteries. Those wires are smaller than the ones from the WFCO.
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Old 02-18-2011, 08:33 AM   #6
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Quote:
Originally Posted by acadianbob View Post
have NEVER seen our 8955 go into Bulk mode. How about you?
So it's not just me.... same here never seen it. I thought maybe I blinked
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Old 02-19-2011, 08:19 AM   #7
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I have the same experience, which is why I use a stand alone charger. If my batteries are getting down to around 50% and I plug into shore power, the trailer's charger will take a couple of days to recharge the batteries.
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Old 02-19-2011, 09:31 AM   #8
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Well, I guess, when DW is done using her hair dryer etc in the morning, I'll disconnect the shore power from the generator and hook up the direct charger. Something else to haul along . . . .
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Old 02-20-2011, 12:29 AM   #9
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If by "direct charger" you mean straight from the generator, you need to be careful as the generator will not stop charging until you turn it off and it can therefore easily overcharge and ruin your battery. That is why I use a stand alone automatic 3-stage charger. It will shut off when the batteries are charged. Good luck.
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Old 03-01-2011, 08:36 PM   #10
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Anybody have advice on battery chargers? Compacter, lighter, safer, reasonable price?

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