Calculating wire size and voltage drop
I'm in the process of adding a second battery bank. The bank is two 6v GC2 @220 AH. I've finally nailed down some exacting measurements and have totalled the two runs from the bank to the distribution...
Forum Discussion
Hi westend,
1 conductors per phase utilizing a #2 Copper conductor will limit the voltage drop to 0.92% or less when supplying 30.0 amps for 10 feet on a 12 volt system.
For Engineering Information Only:
95.0 Amps Rated ampacity of selected conductor
0.1808 Ohms Resistance (Ohms per 1000 feet)
0.045 Ohms Reactance (Ohms per 1000 feet)
0.12 volts maximum allowable voltage drop at 1%
0.109. Actual voltage drop loss at 0.92% for the circuit
0.9 Power Factor
**Note to User:All ampacity values are taken from the Section of 310-15 of the NEC. The conductor characteristics are taken from Table 9 of the NEC. The calculations used to determine the recommended conductor sizes for branch circuits are based on 60°C ampacity ratings for circuits rated 100 amps or less or marked for use with #14 AWG - #1 AWG. Circuits rated over 100 amps or marked for conductors larger than #1 AWG are determined using 75°C ampacity ratings. Calculations to determine service and feeder conductor sizes are based on overcurrent device ratings rather than actual expected loads which are conservative and may yield oversized conductors. No calculations take into account temperature correction factors or conductor de-rating.
This voltage drop calculator is applicable only to NEC applications. It does not optimize conductor sizes for several different loads at various points in a circuit. The total combined load and length of the circuit must be used. Consult with an engineer if your application requires more complex engineering calculations.
1 conductors per phase utilizing a #2 Copper conductor will limit the voltage drop to 0.92% or less when supplying 30.0 amps for 10 feet on a 12 volt system.
For Engineering Information Only:
95.0 Amps Rated ampacity of selected conductor
0.1808 Ohms Resistance (Ohms per 1000 feet)
0.045 Ohms Reactance (Ohms per 1000 feet)
0.12 volts maximum allowable voltage drop at 1%
0.109. Actual voltage drop loss at 0.92% for the circuit
0.9 Power Factor
**Note to User:All ampacity values are taken from the Section of 310-15 of the NEC. The conductor characteristics are taken from Table 9 of the NEC. The calculations used to determine the recommended conductor sizes for branch circuits are based on 60°C ampacity ratings for circuits rated 100 amps or less or marked for use with #14 AWG - #1 AWG. Circuits rated over 100 amps or marked for conductors larger than #1 AWG are determined using 75°C ampacity ratings. Calculations to determine service and feeder conductor sizes are based on overcurrent device ratings rather than actual expected loads which are conservative and may yield oversized conductors. No calculations take into account temperature correction factors or conductor de-rating.
This voltage drop calculator is applicable only to NEC applications. It does not optimize conductor sizes for several different loads at various points in a circuit. The total combined load and length of the circuit must be used. Consult with an engineer if your application requires more complex engineering calculations.
