Guide for wire sizing from charge controller to battery bank?

westbranch said:

go here 5 th item  down  http://forum.solar-electric.com/categories/solar-information-links-sources-event-announcements

Am downloading a free 134 mb program that should open that calculator. I use a bunch of old, cheap computers for reasons unknown.

http://www.openoffice.org/        This worked fairly well....except for "chopping off" the numbers for line loss.

Thought I seen an easy chart in a solar book...once upon a time.

Wheelman55 said:

Southwire has mobile apps for voltage drop and conduit fill.  Once on your smartphone or tablet they don't need an internet connection. 

Thanks! Using these numbers:

Voltage.................40

		volts
Maximum voltage drop...................3		%
Typically, 3% or less is the recommended level for efficient operation of equipment.
Length of cable run.................16		feet
Current at the end of cable run......................16		amps

Yielded this:

Results

I was inputting data for the final run from the combiner box to the charge controller. Guess I didn't need to install the 8awg yesterday after all.

Also feel like I failed to account for one or two things.