PD4655 Charging Graph
I have been reading quite a bit about different converters and charge rates, specifically some claims that PD's seem to drop off earlier than other brands. That is not what I have noticed on my setup,...
Forum Discussion
Nice job! Your PD is holding regulation for about 105 min. That's the best I've seen. Perhaps PD fixed their problems? Perhaps not.
Bottom line, it's all about resistance. The lower the resistance, the more likely the PD will perform. There's a couple of reasons your charge looks good.
1. You have AGM batteries. Battery resistance is half that of typical LA battery. Perhaps 10 mohm lower.
2. You have low line resistance of about 0.4V/55A = 7.3 mohm. That's really low! Your typical cabling could have over 20 mohm resistance.
A typical install has at least 10 mohm more resistance. At 55A, this increase in resistance raises the converter output voltage by: 55A * 10 mohm = 0.55V. After 6 minutes of charging, the PD will now operate at 13.49V + 0.55V = 14.04V. Other PD's couldn't hold regulation at that voltage.
How industrious do you feel? Can you add 10 mohm more line resistance and repeat test? That should verify PD fixed the constant current mode of operation.
Bottom line, it's all about resistance. The lower the resistance, the more likely the PD will perform. There's a couple of reasons your charge looks good.
1. You have AGM batteries. Battery resistance is half that of typical LA battery. Perhaps 10 mohm lower.
2. You have low line resistance of about 0.4V/55A = 7.3 mohm. That's really low! Your typical cabling could have over 20 mohm resistance.
A typical install has at least 10 mohm more resistance. At 55A, this increase in resistance raises the converter output voltage by: 55A * 10 mohm = 0.55V. After 6 minutes of charging, the PD will now operate at 13.49V + 0.55V = 14.04V. Other PD's couldn't hold regulation at that voltage.
How industrious do you feel? Can you add 10 mohm more line resistance and repeat test? That should verify PD fixed the constant current mode of operation.
