Originally Posted by FrankMor
I turned the converter off because I was thinking that it was stuck putting out 14.4 volts since the fan was running all the time. On our motor home, the fan only ran when it was putting out 14.4. I always leave TT plugged in at home, just like we did the MH.
My converter does not have the cutout for the reverse polarity fuses, looking under the edge where they show in WFCO books they are not there, there is a heat sink there. I am going to check voltages, then unhook the ground cable to check the battery voltage. I will take a photo of the converter and try to upload it.
The way the converter works, it supplies the DC needs of the coach FIRST and anything left goes to the battery. If you are using a high draw (or a few low draw) DC items, the time the converter stays in BULK can be quite long (several hours or more).
Try turning off as much DC items as you can if the battery is low. Also in a motor home you have more than one deep cycle battery that needs to be filled.
As the batteries fill to about 50% capacity, the converter will finally switch from BULK (14.4 Vdc) to ABSORBSION (13.6 Vdc) and remain there till the batteries are nearly full provided the camper demand is low.
NOTE: the converter cooling fan will run in both BULK and ABSORBSION.
From the manual (Bold and Underline mine):
All WFCO power converters are automatic three-stage switching power supplies. The converter senses which mode it needs to be in by checking the RV system voltage.
The three modes/stages of operation include:
mode/Normal operation Nominal battery charge and supplies power to appliances Bulk mode/Charge mode Fast battery charge and supplies power to appliances Float mode/Trickle charge Trickle battery charge during storage Absorption Mode: During this mode, the converter output is in the 13.6 Vdc range. This is the normal operation mode. This mode provides the 12 Vdc and current required by the 12 Vdc RV appliances, as well as slow charging the battery.
Mode: When the converter senses that the RV system voltage is less than 13.2 Vdc (equivalent to less than 50% of battery charge) the converter will automatically go into the “Bulk mode.” In this mode, the output voltage of the converter will switch to 14.4 Vdc for a maximum of four hours. If the converter cycles between “Absorption and Bulk mode,” there could be a shorted battery cell or other issues. If the output voltage drops below 13.2 Vdc, the converter automatically changes to a “Bulk mode” 14.4 Vdc (unless the converter is in overload condition). There are two signs of an overloaded converter: Low output voltage, and full converter fold back or shutdown. In both cases, the converter will automatically turn ON, once the complete load is removed. For low output condition, removing the extra (over the current rating) load will be sufficient. If it is impractical to remove all the load, resetting the main breaker will have the same effect.
Mode: If the RV is not being used for approximately 48 hours, with a “no load” condition and the shore power is plugged in, the converter will automatically go in to the “Float mode.”
In this mode, the converter is charging the battery with a trickle voltage of 13.2 Vdc. When the converter senses a demand (by turning on lights), the converter automatically returns to the “Absorption mode” 13.6 Vdc.