DC Series Wound Motor
LocationKent, Washington US map
Web/EmailWebPage email image
Vehicle1971 Volkswagen Beetle
MotorD&D Motor Systems, Inc. ES-31C Series Wound DC
D&D Motor Systems
Weight: 83.0 lbs

72-144 Volts, 18hp, Double Shaft

ES-31C (Similar to ADC #X91-4001)
12hp Cont @ 96 Volts
1.125" Diameter 3" long Double Shaft
Keyway length 2.50
6.7" Diameter x 15.05" long Casing
Peak Horsepower Rating = 49 HP
The efficiency RPM on this motor is
about 110 RPM/Volt
72 Volt 165A 12 HP 1750 RPM
96 Volt 150A 13.6 HP 2950 RPM
Drivetrain4 Speed Manual
ControllerAlltrax AXE 7245 Programmable
24-72 Volt Systems, 450 amps peak. Use
on Series Wound Motors to 19 HP
Continuous 43 HP peak. 72 Volts has a
top speed of 35-40 mph. Added another
battery for a total of 86 volts and
reached 40-45 mph. Alltrax 7245 has a
max over voltage of 90 volts.
Batteries7 Costco/Kirkland Deep Cycle, 12.00 Volt, Lead-Acid, Flooded
115 AH Deep Cycle Batteries.
System Voltage84 Volts
ChargerSchumacher Multi Battery Charger
Multi-charger 10 amp up to 72 Volts. Will
charge 6, 12, and up to 72 Volts of series
DC/DC Converter
Top Speed45 MPH (72 KPH)
AccelerationSlow specially uphill.
Range15 Miles (24 Kilometers)
15 miles tested with 60-70% SOC
Conversion TimeBought the car Sept 08. Started working on
it April 09. Project ongoing.
Conversion Cost$50 on paint.
Additional FeaturesI chose to use a double shaft motor hoping that I can attach
a high voltage/amperage alternator to do a DIY regen/braking
for my setup. I dont know if it will work. We will find

2009-08-12 - Fully charged all the batteries and road tested
it to see how far it will go.... First try was 12 miles
continuous run. Volts down to 12.3 which is equivalent to
60-70% SOC. I will try to see how far will 50% SOC reach.


code by jerry