[RE-wrenches] 3-phase wire run considerations

[William Miller]

Luke:

Maximum inverter output will occur rarely.  Most of the time the 
inverter(s) will be running at lesser output amps.  One approach is to size 
wiring for a certain percentage of the average operating amps.  What is the 
average operating amps?  One way I have found to calculate this is use PV 
Watts and invoke the tool that gives a data set of hour by hour 
results.  This includes night time hours.  Delete all values with a zero 
output and average the rest.  I found a daily bell curve that is about 50% 
of full power.  Your results may vary.

Good luck,

William Miller

At 07:51 PM 11/16/2011, you wrote:
>1: Given the significant cost of the AC cabling for this situation, what 
>is the most appropriate number to use for current in running voltage drop 
>calcs? The wiring is going to be significantly oversized to achieve a ~1% 
>VD at this length. I could use the max rated output current of the 
>inverter (120A), but that seems like it might be overly conservative. Opinions?
>