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N = -1 * (-V/ change in (( tesla * area meters squared)/ seconds))
Step 1: 10,000 Gauss = 1 Tesla or gauss/10000 (eg N42 grade magnet 2x1x1/2 is 13200 gauss) half it for distance away from magnet 6600 gauss/10000 = .66
Step 2: 1,550.0031 inches square = 1 meter square or 1 square inches = 0.00064516 square meters so a 2x1 magnet is 2 square inches and is =to 0.00129032 meter sqd ((2 X .00064516))
Step 3: Find coils Revolutions per minute (a single coil) depending on blades size, tip speed ratio, WIND SPEED) say 500 rpm in 7-10mph wind or 300 in 5mph which is =to 1 turn in .12 seconds and 1 turn in .2 seconds or 8 turns and 5 turns per second respectively.
N = -1 * (-14.5/ (( .66 * .00129032)/ .12)) N = -1 * (-14.5/(0.000851611/.12)) N = -1 * (-14.5/0.00709676) N = -1 * - 2043.185904554 N = 2043.185904554 turns in the coilS to achieve 14.5 volts at 500 rpm or a wind speed of 7-10 mph. (Voltage is variable depending on maximum acceptable charge of battery, rpm is approximated, multiple coils will be necessary to achieve those turns)