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KGCOE MSD Technical Review. P12407- Clean, Self-Sustained Photovoltaic Energy Harvesting System Josh Stephenson Mike Grolling Thomas Praderio. Project Objective.

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KGCOE MSD Technical Review

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Kgcoe msd technical review

KGCOE MSD Technical Review

P12407- Clean, Self-Sustained Photovoltaic Energy Harvesting System

Josh Stephenson

Mike Grolling

Thomas Praderio

Project objective

Project Objective

Utilize and properly manage energy from multiple sources to drive a load or charge a battery with high efficiency for portable applications

Customer requirements

Customer Requirements

  • Design will include safety and component failure

  • Ability to manage inputs from multiple power sources

  • Investigate and benchmark technologies, components and modules

  • System will integrate power management and load distribution.

  • Establish highly efficient energy conversion parameters and design

  • System must manage energy source variability

  • Provide data acquisition points for future team's display design

  • System must be portable

  • System must include instructions for set-up and use

Project specifications

Project Specifications

  • Ability to generate ~5W of power

  • Voltage stabilization for battery charging (~15V ±0.05V)

  • Output voltage of 10V

  • Full solar delivery, provide a max output current of 0.5A

  • Energy Storage is ~5 A-h

  • Multiple solar panels

  • Benchmark given component's specifications

  • Calculate, design, measure each function

  • List DAQ points

  • Efficiencies for each function

Phase 1 preliminary design

Phase 1: Preliminary Design

  • Incorporates single energy source

Initial final design

(initial) Final Design

Final design

Final design

Maximum power point tracking mppt

Maximum power point tracking (MPPT)

Spv1020 mppt ic


Standard bbc configuration

Standard BBC Configuration

Standard battery charger configuration

Standard Battery Charger configuration

Standard power management configuration

Standard Power management configuration

Lithium ion batteries

Lithium-ion batteries

Risk management

Risk Management

Risk management1

Risk Management



  • Winter in Rochester– Forced to rely on artificial light

  • Batteries used during experimentation were 12 years old and

  • did not hold charge very long

  • Flexible PV panels did not supply enough power

  • Buck/Boost did not maintain required voltage while charging

  • Learning curve on PCB layout software

  • Scheduling with PCB ordering during the Chinese New Year

  • Working with BGA footprint

Challenges continued

Challenges continued

  • Express PCB or Eagle CAD?

    • Proprietary vs. open standards

    • Licensing and version issues

  • Finding vendor footprints

    • Finding LGA footprints for the buck-boost

  • Board house selection

    • Price, capabilities, scheduling (Chinese new year)

  • Final decisions:

    • Eagle 5.7 for schematic and board layout

    • MyRo PCB for fabrication

Microcontroller msp430 detail view

Microcontroller MSP430 Detail View

Fractional gain amplifier f or voltage sensing

Fractional Gain Amplifier for Voltage Sensing

Both op amps are powered with a 3V button-cell CR2032

Current shunt monitor ina193

Current Shunt Monitor INA193

Pcb layout

PCB layout



Results continued

Results continued

Future considerations

Future Considerations

  • Troubleshoot analysis on PCB

  • Added display for real-time data capture

  • New batteries



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