Green Machine under the hoodInstrumentationPowerCheq modulesCharger storage
OwnerCarl Ervin
LocationWaco, Texas US 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 12 seasons
Drivetrainoriginal 5 speed manual clutch
no controller
Batteries4 Power Sonic PS-121100, 12.00 Volt, Lead-Acid, Gel
110 Ah
System Voltage48 Volts
48V battery defender, smart charger, 3.5 Amp
DC/DC Converter
InstrumentationLCD voltmeter and LCD Ammeter
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 12 seasons now, on 2nd set of batteries, powersonics really work well !! Had to replace some pulleys.

code by jerry