profdant139 wrote:
My guess is that if you have lithium batteries, you don't have to worry about this phenomenon.
Bottom line -- if actual battery capacity is a moving target, then an amp/hour counter may provide a misleading over-estimate of the remaining juice. And if I have to indulge in guesswork, I can just whip out my cheap old-school multi-meter, measure the voltage, interpolate state of charge, and call it done!
Actually the problem does exist for Li. If pair of brand new Li batteries are compared when one sits of the shelf for 5 years and the other is in use for 5 years, the (never used) shelf unit may have pretty much the same capacity left as the one that was used.
My bottom line was to use just voltage. But I do have a larger bank that most rv'ers. If I had a champagne budget, I'd go with smartgauge.
The Victron gauges are excellent, because they do a peukert calculation (unlike the trimetric).
I guess it comes down to whether there are issues of running out of power or not.
