Originally Posted by Dockhead
They are probably metric.
I had one of these for a few years and didn't like it. The % state of charge function is useless. It's a decent ammeter/voltmeter.
For % state of charge, I found simple voltage measurement under semi-controlled conditions to be far more accurate.
And best of all, apparently, is the SmartGauge -- would recommend having a look at that. I'm planning to put in one of those this spring.
I agree that SOC based on counting electrons is worthless unless yo manually resync and update capacity often. I have worked with owners of very expensive boats that have been misled to rely on them in autosuync mode with the nominal Ah capacity setting just to see batteries die..
I want to use it only as a good ammeter/voltmeter to keep and eye on the alternator
and as an Ah counter to run battery
capacity tests.. I have to get these bloody AGMs to last a bit longer!
Do you have an idea of the diameter of the lugs? I do not worry about SAE or metric, just needs to be about right so that the lug will fit on the stud but not be too loose..
I will keep an eye on your Smartgauge experience. It seems very mysterious but somehow they say it works!