Wonder if my WFCO is starting to go bonkers. Yesterday it went into 14.4v charging mode. I can hear my fans get louder and then confirm voltage with a small voltage display. No biggie. Today i heard my fan turn loud. Voltage display showed 14.4 which is not normal since it just ran a 14.4v mode yesterday. Only lasted 10 seconds. Then again right now it just went to 14.4 again. Been stuck there a few mins. I dont have any batteries hooked up. Isnt the 14.4 mode a timed dealio? On a schedule?

wopachop wrote:Wonder if my WFCO is starting to go bonkers. Yesterday it went into 14.4v charging mode. I can hear my fans get louder and then confirm voltage with a small voltage display. No biggie. Today i heard my fan turn loud. Voltage display showed 14.4 which is not normal since it just ran a 14.4v mode yesterday. Only lasted 10 seconds. Then again right now it just went to 14.4 again. Been stuck there a few mins. I dont have any batteries hooked up. Isnt the 14.4 mode a timed dealio? On a schedule?What you have there is a Unicorn... A WFCO that actually changes modes... There are quite a few of us that would like to study this rare specimum. It is so rare that most of us thought it could not possibly exist.

Good point!!! It must be because i have no batteries attached?

I've caught my WFCO reading >14 from time to time. Still on first battery that came with a now 5 year old unit. Average about 4 months a year use. On shore power mostly.

Whats makes the WFCO jump to 14.4? | Good Sam Community

Huntindog
Explorer
Jun 27, 2021
wopachop wrote:
Wonder if my WFCO is starting to go bonkers. Yesterday it went into 14.4v charging mode. I can hear my fans get louder and then confirm voltage with a small voltage display. No biggie.

Today i heard my fan turn loud. Voltage display showed 14.4 which is not normal since it just ran a 14.4v mode yesterday. Only lasted 10 seconds.

Then again right now it just went to 14.4 again. Been stuck there a few mins. I dont have any batteries hooked up.

Isnt the 14.4 mode a timed dealio? On a schedule?

What you have there is a Unicorn... A WFCO that actually changes modes... There are quite a few of us that would like to study this rare specimum. It is so rare that most of us thought it could not possibly exist.
wopachop
Explorer
Jun 27, 2021
Good point!!! It must be because i have no batteries attached?
wopachop
Explorer
Jun 27, 2021
pianotuna
Nomad III
Jun 27, 2021
Get an accumulator.
dhull
Explorer II
Jun 27, 2021

I've caught my WFCO reading >14 from time to time. Still on first battery that came with a now 5 year old unit. Average about 4 months a year use. On shore power mostly.
Dutch_12078
Explorer II
Jun 27, 2021
On my PowerMax Boondocker converter/charger, 14.7 volts is "boost" mode...
noteven
Explorer III
Jun 27, 2021
My last late model camper had a WFCO. The batteries could be at 12.2v and no bulk charge on shore power.

Fortunately the Zamp kit would completely charge the batteries properly, eventually.

My PD converter chargers in 2 other rigs work properly.
wanderingaimles
Explorer
Jun 27, 2021
MY winnie goes over 14 volts daily for an hour or so, then drops back to about 13.7.
This is going by what my renogy mppt is showing me, prior to installing it, I didn't think it was ever going above 14.
joshuajim
Explorer II
Jun 27, 2021
The only thing that makes a WFCO go to 14.4 is MAGIC!
road-runner
Explorer III
Jun 28, 2021
I can't speak for every WFCO converter. The one I observed worked as follows.
- Converter startup, (AC power applied)
- Converter attempts to supply 13.6 volts at its output.
- At 7 seconds after startup, if output voltage is 13.2 or less, boost mode is entered
- Boost mode continues for 4 hours

The wimpy wiring in most RVs makes it impossible for a low battery to pull the converter output down to 13.2. The converter isn't defective. It's that the converter design and RV design are not compatible.