Q: Can I use a higher rating Solar Panel?
A: Yes a higher rating solar panel can be used, but limited up to 6V, 20W
Q: Can I use a larger battery to charge it?
A: Yes a larger battery can be used, but limited to 7AH
Q: How the load can be changed from fan to lamp?
A: About 6W-10W lamp can be connected in place of fan
Q: Which kind of inverter is used in this project?
A: Any inverter can be used as a solar inverter with just this charge controller.
Q: What is the function of MOSFET in this project? Can we use BJT instead of MOSFET?
A: Here, MOSFET is used as a switch. BJT can be used, but that needs drive current and not voltage as required for MOSFET.