Couple of questions about DC-Dc charging
I've been thinking about adding a DC-DC charger now that I've added 400 amp hours of AGM batteries. There are lots of useful posts but I haven't run into a couple of things I'm curious about. One ...
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Depends on the calculator to be clear if you enter distance or round trip. The actual calculation is round trip of course. This one is clear about what to enter, by saying "set of conductors" and "one-way".
https://www.calculator.net/voltage-drop-calculator.html
EDIT- should be able to use this one to compare with the ones that are not clear to see what those ones are using?
On the question of calculating the input amps difference from using fatter wire, I am thinking you could use the DC-DC-efficiency of watts out vs watts in (pick, say 90%) and get your input watts from the known output watts, then use the wire table to get the input voltage based on an alternator voltage, and thus get the amps from the input watts. Haven't tried that, but somebody who really cares could :)
https://www.calculator.net/voltage-drop-calculator.html
EDIT- should be able to use this one to compare with the ones that are not clear to see what those ones are using?
On the question of calculating the input amps difference from using fatter wire, I am thinking you could use the DC-DC-efficiency of watts out vs watts in (pick, say 90%) and get your input watts from the known output watts, then use the wire table to get the input voltage based on an alternator voltage, and thus get the amps from the input watts. Haven't tried that, but somebody who really cares could :)
