WFCO WF-8955 amps in absorption mode
I have a WFCO-8955 (55 amp) that absolutely will not go into bulk mode even though it’s a 3 stage converter. Not sure if it’s inadequate wiring or an inadequate converter. It’s always 13.6-13.8 no mat...
Forum Discussion
Bobbo wrote:
When my PD4645 goes into boost mode, I read 14.4 volts AT THE CONVERTER. At the same time, I read 13.(something) AT THE BATTERY. The battery voltage slowly rises to the 14.4v level. When it reaches 14.4v, the PD drops to 13.6v for bulk charging.
So, even if the converter/charger is putting out 14.4v, depending on where you read the voltage, you may or may not read 14.4v. (However, I agree that the WFCO is infamous for never going into boost mode.)
I have a 500AH battery bank and when the PD converters (2) in parallel are stuffing 100A into a 50% charged bank the battery voltage is in the 13 ish range and the 2/0 welding cable to the charger doesn't have much drop, the PD output voltage doesn't get to 14.4 volts, holds at less than 14V till the charging current drops below the combined max 100A. The PD output voltage is determined by the lower of the voltage needed to stuff the rated max current into the battery bank or 14.4V. if it reaches max current before the charger output hits it's 14.4V it will stay at the lower voltage until battery charges enough and internal resistance increases enough that 14.4V is needed at the output to hold current.
The PD output is current limited to rated amps AND voltage limited to a max of 14.4V in boost mode.
