Jeff,
Something sounds amiss with your batteries. Longer cables will indeed incur a voltage drop under load, but I assume the voltages you listed were open circuit or lightly loaded. You mentioned the difference is larger after sitting longer. Is there perhaps a low current drain on one battery?
A 6 ft section of 4 gauge wire will see a voltage drop of 1.3 V when carrying about 900 A.
Any open circuit voltage south of 12.5 V is worth investigating.
Chris Zavatson
N91CZ
360std
On Tuesday, October 22, 2013 9:29 AM, Paul Miller <pjdmiller@gmail.com> wrote:
Option to monitor temp: place a small thermistor pad under the battery and monitor battery temps. It probably can be an input to an engine monitoring system so no need for a separate gauge. We have that setup on the certified plane.
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