They are simply calculators that rely on proper programming to yield a more accurate output. This is a real problem that does happen, not a made up problem that might happen.įACT: Ah or Coulomb Counters are very accurate at counting Ah’s (they actually count kWh but display Ah) but they can not track changes or declines in your batteries actual energy capacity. Is this the fault of the Ah counter? No, not entirely, it is the fault of improper use, poor programming and the inherent limitations of the typical Ah counter.įACT: If you do not keep up with programming your Ah counter, on a continual basis, Ah counters do not theoretically get out of sync with your battery, they physically get out of sync with your battery. This is simple I have not yet seen an Ah counter programmed to within 10% of actual tested capacity and most are far worse than a 10% error.
I know this sounds shockingly surprising, but when you fully understand and comprehend how Coulomb counting works, and how a battery ages, it becomes a lot clearer as to why such craziness can be stated.Īs a marine electrician who is physically set up to test batteries for their true Ah capacity, I note the screen on the battery monitor when I remove batteries and bring them to my shop for testing. However, the shunt wiring is confusing for some boat owners who do a DIY install, as well as some professionals. Most of the time the failure of the installation is in the programming, which is typically a lack thereof.
To sum it up in simple terms we have yet to come across more than a handful of properly installed and properly calibrated Ah counters.
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