Just when I thought I was ready to splash my boat for the season I made a disturbing discovery concerning one of the batteries in the 48 volt propulsion bank. The Dual Pro PS4 battery charger showed battery number four with a blinking green light where as all the others were steady after having been charged. This was a new development as for the past several weeks all the batteries had been charging normally on my visits. For some reason the charger thinks battery four is not yet fully charged. I disconnected the power from the charger to let the batteries sit overnight and make sure it would not fire up when I plugged the extension cord back on my return in the morning.
The next morning I went into the cockpit and threw the switch on the helm instrumentation panel that powers the individual battery meters. My suspicions were confirmed. Battery four is not being charged properly. BTW this battery is the most negative battery in the string. I found some corrosion on the negative terminal of the this battery and using a tester found that the internal resistance was 194 milli ohms. The last time I did the test it was 2.34 milli ohms.
Some photos are here:
http://biankablog.blogspot.com/2016/06/battery-anomaly-part-two-readings-and.html
So now I'm faced with a dilemma. The bank is eight years old. The other three 8A4D AGM batteries seem fine. Do I just buy a replacement battery which will now be much younger than the other batteries in the pack. Though I'm not sure I want to spring for four new batteries if the other three are still good. Any thoughts?
Posted by: biankablog@verizon.net
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