My measurements lead me to conclude that, with lithium batteries, voltage is a rather poor indication of state of charge. The voltmeter which is part of my control panel displays voltage to 0.1 volts. The (new and improved) graph of voltage vs. consumed amp-hours for RELiON RB100 batteries shows that a 50% drop in state of charge results in a voltage drop of only 0.2 volts, so a 50% drop in SOC would hardly be noticeable without a battery monitor.
I wonder if I will be able to mount the monitor in a good spot. I have seen others mount it beside their control panel, commenting that it was the most difficult part of the install. I'll post an update when I tackle the job in the spring.
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"Little Toot" (2017 Forester 2391 TS)
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