Different question on wfco
I have a year old rv with 2 interstate cg2 232 amp hr batteries & had a 55 amp amp wfco converter. I called Randy @ best converters & asked about charging my batteries without running the generator al...
Forum Discussion
The 73 amps on 232AH Capacity would have the amps start to taper from constant 73 amps at about 70% SOC, so if the batteries were nearly at that already, as stated in the OP where accurate SOC is unsure, the Boondocker could well have settled on 13.6 during that first 15 minutes.
Here is another set of ugly graphs that show how increasing the charging rate lowers the SOC at which amps will start to taper. In this set, the amps taper at 14 amps, so with the Boondocker getting them to 14.6 first, the SOCs would be higher before tapering, but you get the idea. (which is where I got the WAG of 70% instead of 65%)
You see that 29 minutes from 50% SOC. So if you started at 65%, say, it would take less than 15 minutes to get there.
Also that 6ft of #4 at 73 amps will have some voltage drop, so the converter will think the batteries are higher in voltage than they are and trigger the drop to Absorption at 13.6v sooner.
Here is another set of ugly graphs that show how increasing the charging rate lowers the SOC at which amps will start to taper. In this set, the amps taper at 14 amps, so with the Boondocker getting them to 14.6 first, the SOCs would be higher before tapering, but you get the idea. (which is where I got the WAG of 70% instead of 65%)
You see that 29 minutes from 50% SOC. So if you started at 65%, say, it would take less than 15 minutes to get there.
Also that 6ft of #4 at 73 amps will have some voltage drop, so the converter will think the batteries are higher in voltage than they are and trigger the drop to Absorption at 13.6v sooner.
