search

Xinyuan-LilyGO / LilyGO-T-SIM7000G

LilyGO T-SIM7000G
https://pt.aliexpress.com/item/4000542688096.html
284 stars 123 forks source link

Can we use Solar Panel and USB Simultaneously #215

Open abhaysbharadwaj opened 1 year ago

abhaysbharadwaj commented 1 year ago

Hello there, I am trying to use this board in a hobby project and had one question: It is on my terrace with a 6V/4W solar panel connected to it. I want to re-program it using the USB. Can I connect the USB while the solar panel is connected?

Does the Mosfet circuit guarantee that there will be no back flow of voltage or current from the USB that will damage the solar panel? Also, since the solar panel is 6V and peaks to 6.5V, if we connect the USB, does the Mosfet circuit ensure that 6V will not flow to the USB to damage my computer when I connect for programming?

This is the circuit in the schematic that I assume will ensure protection / isolation if we connect a USB while the solar panel is connected: image

fgnievinski commented 1 year ago

here it says it's okay:

Using the solar in at the same time as USB-C/5V is ok, as the USB-C power effectively turns off the solar.

https://github.com/Xinyuan-LilyGO/LilyGO-T-SIM7000G/issues/237#issuecomment-1576129143