FLA characteristics

[lateral]

Originally Posted by rslifkin

Yes, a given wire run will drop more voltage as you feed more current through it. So as the current drops off, the voltage drop decreases.

Thanks! Of course, V=IR where resistance is relatively constant?

[Stu Jackson]

How about your bulk time period is too short?

[Bycrick]

3% voltage drop at 14.5 volts is 0.44 volts. That’s a big difference when you’re trying to charge a battery at a specified voltage, but measuring at the charger. My assertion is that battery wiring can never be too big, but only a reasonable compromise. Designing for 1% drop is my goal.

Once upon a time for a class I was teaching, I stumbled across a statement, which I’ve never been able to find again, that a good engineering number for the resistance of each interface in a wiring system, ie from battery post to terminal, from terminal to wire, etc.) was .0002 ohms. But in a system that connects battery + to a fuse to a switch to a bus bar to an alternator and back to the battery, that results in 30+ interfaces. So, that’s about .006 ohms, not counting the wire or any of the components, like fuses, switches, bus bars, etc. At 100 amps, that drops 0.6 volts.

[lateral]

Exactly the clarity I needed, thanks.
I wonder if this is contributing to the inaccuracy of
SG200? SOC that is.