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 Technical Information -  3% Voltage Drop Charts 

 

Chart#1... 3% Voltage Drop @ 12 Volts

Sample Calculation= 50 A load 20 ft* from battery require a minimum 2 gauge wire
Amps 5 10 15 20 25 30 40 50 60 70 80 90 100 150 200 250 300 350 400 445
Feet      
10' 18 14 12 12 10 10 8 8 6 6 6 4 4 2 2 1 1/0 1/0 2/0 3/0
15' 16 12 10 10 8 8 6 6 4 4 4 2 2 1 1/0 2/0 3/0 3/0 4/0 4/0
20' 14 12 10 8 8 6 6 4 4 4 2 2 2 1/0 2/0 3/0 4/0 4/0 x x
25' 14 10 8 8 6 6 4 4 2 2 2 1 1 2/0 3/0 4/0 x      
30' 12 10 8 6 6 4 4 2 2 2 1 1/0 1/0 3/0 4/0 x        
40' 12 8 6 6 4 4 2 2 1 1/0 1/0 2/0 2/0 3/0 x          
50' 10 8 6 4 4 2 2 1 1/0 1/0 2/0 3/0 3/0 x            
60' 10 6 6 4 2 2 1 1/0 2/0 2/0 3/0 3/0 4/0 x            
70' 10 6 4 2 2 2 1/0 2/0 2/0 3/0 3/0 4/0 4/0 x            
80' 8 6 4 2 2 1 1/0 2/0 3/0 3/0 4/0 x                
90' 8 4 4 2 1 1/0 2/0 3/0 3/0 4/0 x                  
100' 8 4 2 2 1 1/0 2/0 3/0 4/0 4/0 x                  
110' 8 4 2 2 1 1/0 2/0 3/0 4/0 x                    
120' 6 4 2 1 1/0 2/0 3/0 4/0 4/0 x                    
130' 6 4 2 1 1/0 2/0 3/0 4/0 x                      
140' 6 2 2 1/0 2/0 2/0 3/0 4/0 x                      
150' 6 2 1 1/0 2/0 3/0 4/0 x                        
160' 6 2 1 1/0 2/0 3/0 4/0 x                        
170' 6 2 1 2/0 3/0 3/0 4/0 x                        
180' 6 2 1 1/0 2/0 3/0 x                          
190' 4 2 1 2/0 3/0 4/0 x                          
200' 4 2 1/0 2/0 3.0 4/0 x                          
Amps 5 10 15 20 25 30 40 50 60 70 80 90 100 150 200 250 300 350 400 445
*  From Battery To Load & Back to Battery
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 Revised:12/29/2008 06:55:53