the owners manual for the WFCO states that the converter only goes to bulk when bat capacity is below 50%.
That's a marketing generalization that is close to meaningless. The following factors determine whether or not the WFCO converter will go into bulk mode:
- Size of the battery bank with respect to the converter size.
- Condition of the battery.
- Discharge level of the battery.
- Ambient temperature.
- Other DC loads running in the RV.
- Resistance of the wiring between the converter and battery.
Based on the forum posts from WFCO users it's a reasonable conclusion that very few ever go into bulk mode during their entire lifetime. Based on statistics, you should assume that yours won't.
