Hi! I need help designing a circuit to boost a 12V DC source...a vehicle battery from 12V DC to 13.8 to 14.5 volts DC to charge an RV battery.

Problem: Current charging circuit = 40' of #12 cu. 20' in length and 40' of #8 cu. 20' in length. Voltage drop through this circuit is too great to allow adequate charging of RV battery at end of line.

Specs:
Input Voltage 11 to 12v DC
Ouput Voltage 13.8 to 14.5v DC
Charge Rate minimum = 10 amps/hour but would like 20 to 30 amps/hour is possible.

Any help would be appreciated.

Thanks, Bill K

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None of us is a smart as all of us!

 

if ripple is too high connect external inductance to cct
the link below is invaluable (THIS LINK IS GOLD),
interactive power electronics online text (i discovered it 3 months ago during university semester when i was studying a course power electronics and drives). even details microcontroller implementation!

http://www.ee.uts.edu.au/~venkat/pe_...3/ch07s3p1.htm