Stripped DownConroller an contactor location.Battery FrameBattery FrameMotor and Fuse Shot.Hood Mod and LetteringClose up of Lettering
OwnerDavid Eshbach
LocationDouglassville, Pennsylvania US map
Web/EmailWebPage email image
Vehicle Craftsman
All Wheel Steering, 42" Deck.
MotorBriggs and Stratton Etek/Mars 3001 PMSM/BLDC Motor Brushless DC
Designed for long life. Do not need brush maintenance. The motor is 90% efficiency at voltages between 24 to 48VDC. Continuous current is 100 amps at 48 VDC. Max current is 300A. This is a 3-phase, Y-connected Permanent Magnet Synchronous Motor with an axial air gap.
DrivetrainTransaxle
ControllerKelly KBL48301
KBL48301,24V-48V,300A,BLDC Controller/With Regen
Batteries4, 12.00 Volt, Lead-Acid, Flooded
75Ah. I live near a Deka production plant. Got these at there plant store. They were the best deal for what I need. They are 2nd's. This means they could not sell as new because of blemishes or some other cosmetic reason, but they work fine and are technically new batteries.
System Voltage48 Volts
ChargerKelly HWC1B Series 48V/15A
Top SpeedSame as with 12.5hp gas motor
AccelerationQuicker than 12.5hp gas motor
RangeJust enough to do my yard. About 45 minutes.
Conversion Time3 months on and off. Most of this time was me changing my mind on things and waiting for other parts to arrive.
Conversion CostI had done a overkill on some things*. Motor ($450), Controller* ($400). Aluminum Extrusion* ($200). Main Contactor ($70)
Additional FeaturesAll Wheel Steering.
Controller was a overkill but it is awesome. Programming capabilities make it nice and safer.
Currently do not have 4th battery mounted. I was going to mount it in front of other batteries and lower. It would still fit under hood (which is not on yet). I decided I would like to mount on back to distribute the weight a little better.

I cut the lawn 3 times in high wet grass all 3 times. I ran each time about 45 minutes and ran the batteries down to about 45%.

I am really happy with it. No more oil changes, tune ups, fouled plugs, carburetor problems, starter problems. So far just mow and plug in and it's reading to go again when ready.

10-27-09: finally installed the hood. I also used to do vinyl lettering, so I did a little lettering on the hood. Check out the "No Gas" sticker I made on the lower corner of the hood.

I am going to get power cheq modules to maintain batteries better.

code by jerry