Electronic – How to connect solar panel to boost converter

boostdc/dc convertersolar cell

Here I design a boost converter with 5 V input and 19.37 V output
and it is working very well when the source is DC battery
but when the source is a solar panel with also 5 V output I have no boost for the voltage did anyone know why this happens??

Solar panel

Here is the solar panel description:

  • Brand: GH Solar
  • Solar panel 10 W
  • Solar cell poly technology
  • Dimensions: 25.5 X 34.5 cm
  • Voltage at Pmax: 17.8 V
  • Current at Pmax: 0.57 A

Schematic

Here the boost converter's input parameters

  • Vin: 5 V
  • RL: 100 Ω
  • Cout: 470 µF
  • Cin: 470 µF
  • L: 560 µH

Best Answer

The huge difference between a battery which is a voltage source and a PV panel which a current source is impedance.

A charge needs a low impedance based on the need for a low voltage drop to rise in current ratio.

Any time voltage is transformed up by N, impedance is also transformed down by N\$^2\$ thus stressing worse your design problem of impedance mismatch.

Your goal , should you wish to learn, is to compute the required PV source impedance to drive your effective load impedance using : Load ESR/N^2=Voc/Isc=Zsource=V/I @ Pmax.

  • for OC=open circuit and SC= short circuit

Z(L)=2pi*f * L