July 20 - Solar Array Meeting

MPPT

• V Output 18-33 V

• V in: 10-30 V

• Max Efficiency:

  • VOC boost ratio > 1.1 times

• Minimum voltage: 18 V

• Constraints for Module sizes

  • Max. Output Voltage dependent on number of modules

  • V0 = 151.2/n, n=number of modules in series

• Split between Modules 3 and 4

• Cap: 236 cells for 5 m^2 surface area

• Each solar cell = 2.7 V, connect into series up to 18 V

• Adjust each MPPT’s output voltage separately

• Refer to last years calculations: PV Array Layout

• MPPT’s Used:

  • Options: same as MSXII or create own using same chip

Voc Calculations

Voc = 0.721 V

n = 6

Vo = 25.2 V

Vin = 0.721*27 = 19.467 V

B = 25.2/19.467 = 1.294

Section Division

Final Decision:

2 layouts generated for review

Total 12 models each layout

Calculations Spreadsheet