1. 15W Solar Panel: We'll assume the maximum power point voltage (Vmp) is around 18V and current (Imp) is around 0.83A.
2. MPPT Charge Controller IC: A good option might be the BQ24650 from Texas Instruments.
3. MOSFETs for switching.
4. Inductor for energy storage.
5. Capacitors for filtering.
6. Current Shunt Resistor for current sensing.
7. Diodes for protection.

1. Solar Panel to MPPT IC:
   • Connect the positive output of the solar panel to PVCC pin on the BQ24650.
   • Connect the negative output of the solar panel to GND.
2. MPPT IC to Battery Pack:
   • Connect the BAT pin on the BQ24650 to the positive terminal of your 24V battery pack.
   • Connect the negative terminal of the battery pack to GND.
3. Inductor and MOSFETs:
   • Connect an inductor in series with the HIDRV and LODRV pins of the BQ24650 for switching.
   • Use MOSFETs like IRF540N for high-current switching.
4. Current Shunt Resistor:
   • Place a current shunt resistor between the SNS pin and GND on the BQ24650 for current sensing.
5. Capacitors:
   • Add capacitors between PVCC and GND, and between BAT and GND for filtering.
6. Diodes:
   • Add a Schottky diode, like the 1N5819, between the solar panel's positive output and PVCC pin for reverse-current protection.

1. Insert necessary components into your Flux project:
   • BQ24650
   • IRF540N
   • 1N5819
   • Inductor and capacitors as required.
2. Wire the components as described above:
   • For each connection, follow the pin names and ensure all grounds (GND) are connected together.
3. Adjust component values like the inductor, capacitors, and resistors as per the specific requirements of the BQ24650 datasheet for optimal performance.

• MPPT Charge Controller IC: BQ24650
• N-Channel MOSFETs: IRF540N (2 pieces)
• Schottky Diode: 1N5819
• Inductor: 47 µH capable of handling at least 1A current
• Capacitors:
  • Input Capacitor ($C_{IN}$): 220 µF, 25V
  • Output Capacitor ($C_{OUT}$): 330 µF, 35V
• Current Shunt Resistor: 0.1 Ω, 2W

1. Solar Panel to MPPT IC:
   • Connect the positive output of the solar panel to BQ24650:PVCC.
   • Connect the negative output of the solar panel to GND.
2. MPPT IC to Battery Pack:
   • Connect BQ24650:BAT to the positive terminal of your 24V battery pack.
   • Connect the negative terminal of the battery pack to GND.
3. Inductor and MOSFETs:
   • Connect the source of the first IRF540N MOSFET to GND.
   • Connect the drain of the first IRF540N MOSFET to one side of the inductor.
   • Connect the other side of the inductor to BQ24650:PH.
   • Connect the drain of the second IRF540N MOSFET to BQ24650:PH.
   • Connect the source of the second IRF540N MOSFET to BQ24650:BTST.
4. Schottky Diode:
   • Connect the cathode of the 1N5819 to BQ24650:PVCC.
   • Connect the anode of the 1N5819 to GND.
5. Capacitors:
   • Connect $C_{IN}$ between PVCC and GND.
   • Connect $C_{OUT}$ between BAT and GND.
6. Current Shunt Resistor:
   • Connect one side of the shunt resistor to GND.
   • Connect the other side to BQ24650:SRN.
7. Ground Connections:
   • Ensure all GND pins from the solar panel, caps, MOSFETs, and IC are connected together. Use a solid ground plane if possible.

• Connect Solar Panel (+) to PVCC.
• Connect Solar Panel (-) to GND.
• Connect BAT to Battery (+).
• Connect Battery (-) to GND.
• Connect Source to GND.
• Connect Drain to one side of Inductor; other side of Inductor to PH.
• Connect second Drain to PH.
• Connect second Source to BTST.
• Connect Cathode to PVCC.
• Connect Anode to GND.
• Connect Capacitance ($C_{IN}$) to PVCC and GND.
• Connect Capacitance ($C_{OUT}$) to BAT and GND.

1. Create a New Project in Flux.
2. Add Components:
   • BQ24650
   • IRF540N (2 pieces)
   • 1N5819
   • Inductor (47 µH, capable of handling at least 1A)
   • Capacitors (220 µF, 25V for $C_{IN}$ and 330 µF, 35V for $C_{OUT}$)
   • Current Shunt Resistor (0.1 Ω, 2W)
3. Connect the Components:
   • Solar Panel to MPPT IC:
     • Connect the positive output of the solar panel to BQ24650:PVCC.
     • Connect the negative output of the solar panel to GND.
   • MPPT IC to Battery Pack:
     • Connect BQ24650:BAT to the positive terminal of the battery.
     • Connect the negative terminal of the battery to GND.
   • Inductor and MOSFETs:
     • Connect the source of the first IRF540N MOSFET to GND.
     • Connect the drain of the first IRF540N MOSFET to one side of the inductor.
     • Connect the other side of the inductor to BQ24650:PH.
     • Connect the drain of the second IRF540N MOSFET to BQ24650:PH.
     • Connect the source of the second IRF540N MOSFET to BQ24650:BTST.
   • Schottky Diode:
     • Connect the cathode of the 1N5819 to BQ24650:PVCC.
     • Connect the anode of the 1N5819 to GND.
   • Capacitors:
     • Connect $C_{IN}$ between PVCC and GND.
     • Connect $C_{OUT}$ between BAT and GND.
   • Current Shunt Resistor:
     • Connect one side of the shunt resistor to GND.
     • Connect the other side to BQ24650:SRN.
   • Ground Connections:
     • Ensure all GND pins from solar panel, capacitors, MOSFETs, and IC are connected together.

1. Create a New Project in Flux
   • Open Flux and start a new project.
2. Add Components
   • Search for BQ24650 in the component library and add it to your schematic.
   • Search for IRF540N and add two of them to your schematic.
   • Search for 1N5819 and add it to your schematic.
   • Add an inductor with a specification of 47 µH, capable of handling at least 1A current.
   • Add capacitors: 220 µF, 25V for input filtering $C_{IN}$ and 330 µF, 35V for output filtering $C_{OUT}$.
   • Add a current shunt resistor with a value of 0.1 Ω, 2W.

3. Wire the Solar Panel to MPPT IC
   • Connect the + output of the solar panel to the PVCC pin on the BQ24650.
   • Connect the - output of the solar panel to GND.
4. Connect MPPT IC to Battery Pack
   • Connect BAT pin on the BQ24650 to the positive terminal of the 24V battery pack.
   • Connect the negative terminal of the battery pack to GND.
5. Add and Connect Inductor and MOSFETs
   • Place the inductor, and connect it appropriately:
     • Connect one end of the inductor to the drain of the first IRF540N MOSFET.
     • Connect the other end of the inductor to PH pin on the BQ24650.
   • Connect the source of the first IRF540N MOSFET to GND.
   • Connect the drain of the second IRF540N MOSFET to PH pin.
   • Connect the source of the second IRF540N MOSFET to the BTST pin on the BQ24650.
6. Add the Schottky Diode
   • Connect the cathode of the 1N5819 Schottky diode to the PVCC pin.
   • Connect the anode to GND.
7. Place and Connect Capacitors
   • Connect the $C_{IN}$ capacitor between PVCC and GND.
   • Connect the $C_{OUT}$ capacitor between BAT and GND.
8. Include the Current Shunt Resistor
   • Connect one side of the shunt resistor to GND.
   • Connect the other side to SRN pin on the BQ24650.
9. Ensure All Ground Connections
   • Make sure all GND pins from the solar panel, capacitors, MOSFETs, and the IC are connected together.

Solar Panel (+) -> BQ24650:PVCC
Solar Panel (-) -> GND

BQ24650:BAT -> Battery (+)
Battery (-) -> GND

IRF540N 1 (Source) -> GND
IRF540N 1 (Drain) -> Inductor (one side)
Inductor (other side) -> BQ24650:PH

IRF540N 2 (Drain) -> BQ24650:PH
IRF540N 2 (Source) -> BQ24650:BTST

1N5819 (Cathode) -> BQ24650:PVCC
1N5819 (Anode) -> GND

Capacitor $C_{IN}$ -> PVCC and GND
Capacitor $C_{OUT}$ -> BAT and GND

Current Shunt Resistor (one side) -> GND
Current Shunt Resistor (other side) -> BQ24650:SRN