Solar Meeting Notes (Fall 2024) [MSIV]

Owned by Liam Sky
Oct 11, 2024
1 min read

Solar Sense Rev 2.0 concept:

  • Nomura solar sense PCB

  • This PCB will measure the voltage after each MPPT and the current through each string of 5 MPPTs

  •  Connected on junction of -BAT to 1st and 6th MPPT

  • HV Side:

    • 10 ADC connected to voltage tap (rated for difference between voltages)

    • Runs into I2C/SPI digital isolator

    • Connector with extra pin for shielding on wires

  • LV Side:

    • VBAT- and GND for MPPT #6 and #1 connector

    • 2 SMD shunts  (~7A rated) to measure current through MPPTs

    • STM32 connected with I2C or SPI to digital isolator collect data

 

In person solar panel and MPPT testing

  • Date TBD (after midterms and during sunshine )

  • Test MPPTs connected to panels outdoors connected to an E-load

 

 

Custom MPPT and Solar Sense PCB

  • This project involves designing our own MPPTs and deciding how the solar sense board should interact with them (feedback)

  • Currently deciding on how the MPPT should be designed (buck-boost or Cuk converter?)