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trouble is, over time batteries loose capacity, so you could program that in as well but then you are just making a complex system to give you a simple read out, why not get all the information at your finger tips and have a simple read out as well? at least that is how the paktrkr gauge works, the display is split in half so you can have half of it give you a real time graph of battery voltage for each and every battery so you can see how the voltage drop is for each battery as you accelerate or you can have it show you a mock fuel gauge, or a graph showing a single group of batteries, or pack voltage.
the other half of the display only gives you numbers, so you can have pack voltage there as well, or percent full (like fuel gauge only in 00%), number of amps that are being drawn (if you have the amp meter pickup) number of KW's that are being used (again, amp meter pickup) voltage of each battery in a set flashing up on the display for a few seconds and it will display temperature.
If you over charge the batteries it will give you a warning and tell you what battery is over charged, same with over discharge, if it notices one of them is to quick to charge it will also give you a warning that you should check the water level, so kind of like a fuel gauge and check engine light with a check engine light reader all in a rather small gauge.
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