The solar power cube is driven by a solar panel to pump hydraulic fluid with the initial purpose of powering an autonomous tractor for agricultural use.
Specifications
Solar Panel
STC Power Rating 290W
PTC Power Rating 263.07W 1
STC Power per unit of area 13.8W/ft2 (148.2W/m2)
Peak Efficiency 14.82%
Power Tolerances -3%/+3%
Number of Cells 72
Nominal Voltage not applicable
Imp 8.02A
Vmp 36.4V
Dimensions: 77.6in (1,972mm) x 39.1in (992mm) x 1.6in (40mm)
Weight: 50.7lb (23kg)
Hanwha Solar Panel
DC Motor and Controller
450W 36 V DC electric motor MY1020z gear reduction
Input Voltage: 36 V
Base RPM: 450
Wires: 12 Gauge
Efficiency: 78%
Full Load Amps: 16
Current Type: DC
Gear Ratio: 6.67:1
Shaft Diameter: 20 mm (13/16")
Reversible
EBAY MY1020z $67.05
PWM Motor Speed Controls DC 36V DC Gear Motor Speed Controller
Input voltage: DC9-60V
Output voltage: Linear load
Output current: 0-20A
Continuous power: 12600W
Speed mode: potentiometer (linear)
Speed range: 0-100%
Control frequency: 25KHZ
Forward reversal: support
Suitable for motor: DC brush
Pot mounting hole: 7mm
Product size: approx. 92*50*36mm/3.62*1.96*1.41
Net weight: approx. 145g
Center distance: approx. 104mm
EBAY $10.99
Hydraulic Power Unit
Power 5 HP 3600 RPM
Flow 2 GPM max.
Pressure 2500 PSI max.
Reservoir 1.1 gallons
Shaft 1/2" dia. x 7/8" w/keyway
Rotation CW
Ports 3/8" NPT pressure
Return 3/8" & 3/4" NPT
Orientation Vertical
Size 10" x 10" x 10"
Shpg. 13 lbs.
Surplus Center Hydraulic Power Unit $109.95
Timing Belt and Pulleys
File:PC17.10-Timig-Pulleys.png Timing Belt
Hydraulic Motor (for reference)
31.88 cubic inch / revolution
SAE 10 ports
SAE 4 case drain
Calculations
Power
Max Input: 290 W / (746 W/HP) = 0.389 HP
Motor Torque @ 450 RPM = 4.54 ft-lb
Torque (ft-lb) = (HP * 33000) / (2 * pi * rotational speed) = (.389 * 33000) / (2 * 3.14159 * 450) = 4.54 ft-lbs
Torque (NM) = Watts / (2 * pi * rotational speed) = 290 / (2 * 3.14159 * 450) = 0.102 NM
This will be used to determine pulley and belt specs
RPM input/output
Max motor RPM: 2500
Max Hydraulic Pump RPM: 3600
Max Hydraulic Motor RPM: 240
Estimated Max Wheel RPM: 1
Max Torque input / output
Power Cube Working Document
["https://docs.google.com/spreadsheets/d/1KNVP2O3KogC6jyxMuRALWTxrYjyCJ4ChjeZsJVdqHsg/edit#gid=1"]
