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Old 04-06-2015, 09:32 AM   #11
Bus Crazy
 
Join Date: Nov 2011
Location: Sault Ste. Marie, Ontario
Posts: 1,439
Year: 1997
Coachwork: Thomas
Chassis: B3800 Short bus
Engine: T444E
Rated Cap: 36
Quote:
Originally Posted by Redbear View Post
This means you would get slightly more wattage charging a 12-volt bank from 36 volts rather than series-wiring the panels for 72 volts, assuming you can eliminate the losses in the wiring for twice the amps into the controller at the lower voltage.
Yes indeed. Here is a nice tool for cable sizing: DC Cable Sizing Tool - Wire Size Calculator - MM2 & AWG - solar-wind.co.uk. I have used it for all major DC wire runs inside my bus. There are more accurate ones out there, but they are also more confusing. Go for 1% acceptable loss and you'll be golden.
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