Wire Gauge Required Question
For some reason I just can't understand the various wire gauge tables, and I have tried to, so I am hoping somebody will take pity and do all the work! :) One table that I can follow says that for...
Forum Discussion
Salvo wrote:
NO!!!!
I believe the OP wanted to know how a cable loss between panel and conroller reflects on charging current.
I've answered than question. Both of you are now mixing up issues. He's got a fixed current. Don't complecate things. Doubling current doesn't belong in this discussion. It has no relevance.
Salken white wrote:
Power is also equal to V^2/R so if the resistance of the cable/wire does not change, then doubling the cable voltage drop creates a factor of 4 increase in power loss for the cable.
Maybe that is what he was trying to say?
OP ALSO asked about series vs. parallel operation with MPPT. That gives TWO current senerios to evalate power losses for. That's the example I gave showing series has a distinct advantage over parallel because of greatly reduced cable power losses, a factor of 4 since the difference in cable current between the two cases is a factor of 2 with the same resistance.
However, once the battery acceptance current drops below what the controller is capable of providing, then the cable drop becomes a moot point, it no longer has any noticeable effect on operation
