I bought a cobra 1575 watt inverter for my boat, I'd like to put the inverter in the cabin about 15' from the battery. The manual reccomends a minimum size of #4 awg copper cable no longer than 4 feet between inverter and battery. that sounds very undersized? comparing it to this post I found,
(((If we assume a maximum power of 1500 Watts out of the inverter, at about 80% efficiency and a low point operating voltage of 10V, then (1500/.8/10 would give about 187.5 Amps. I would probably size it for about 200 Amps of current which would yeild a cable size of about 0 guage minimum)))
Using his math with my 1575/.8/10 = 196.875
so my first question is why would the manufacture reccomend #4awg 90 amp wire when it can draw upto 197 amps?
and what size wire do I ACTUALLY need to run the inverter about 15' from the battery? would 0 gauge work? probly not because its 15' right? so 1/0 awg?
Im having a hard time learning about this DC voltage drop