Green Machine under the hoodInstrumentationPowerCheq modulesCharger storage
OwnerCarl Ervin
LocationWaco, Texas United States map
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Vehicle1992 Sears
Craftsman 12.5 Hp 38" cut 5 speed lawn tractor
MotorBriggs and Stratton ETEK Permanent Magnet DC
8 HP continuous, 15 Hp max, 3450 rpm at 48
volts, very durable, running now 14 seasons
Drivetrainoriginal 5 speed manual clutch
no controller
Batteries4 Power Sonic PS-121000, 12.00 Volt, Lead-Acid, Gel
100 Ah
System Voltage48 Volts
48V battery defender, smart charger, 3.5 Amp
DC/DC Converter
InstrumentationLCD voltmeter and LCD Ammeter
Top Speed5 MPH ( 8 KPH)
Seating Capacity1 adult
Curb Weight400 Pounds (181 Kilograms)
The battery pack added 270 pounds to the tractor
Tiresstandard turf saver tires
Conversion Time1 week
Conversion Cost$1300
Additional FeaturesFull safety interlocks were retained in the system . Three PowerCheq
modules are attached to battery pack to keep it balanced.
Mower pulls about 5 amps in neutral, 15 amps in normal mowing
speed(#2), 70-125 amps in average-to-high grass, (mower deck
engaged). It is fused at 250 Amps, motor max is 300 amps. Cuts high
grass better now than when it was a 12.5 Hp gasser. I have a 120' by
120' lot, 2/3 of which is mowable, I have mowed it twice on a charge
and the battery pack is still at 42V, 36V is minimum voltage allowed

Going on 14 seasons now, on 2nd set of batteries, powersonics really
work well !! Had to replace some pulleys.

code by jerry