Grit dog wrote:
My mistake, by much smaller, I meant couple sizes (which is considerably smaller diameter and cost).
A 2000W inverter will draw approx 200A at full load.
I also assumed a relatively short wire run, under 10’. With that 1/0 would be more than sufficient and 2/0 would be conservative.
No harm in overkill on wire size. ( Just like pickup trucks, right? Lol). Just not necessary for the load from a 2000W inverter unless it’s a long run. Which would make no sense as it’s far more efficient to have the DC load close to the power source and distribute with AC current to AC loads.
IMO one should strive for =<2% of voltage drop (while under maximum load) to get maximum productivity from the inverter and battery. Higher voltage drops reduce the number of AH you can access from the battery, and thus the inverter's runtime.
If you used 4/0 cable for a 2000w inverter (while under a maximum load of ~200a), the longest cable run you could use and still maintain a 2% voltage drop would be 12 ft. This would drop to 8 ft. with 2/0 cable and 6 ft. with 1/0.
