Hi Tauro0221, sorry I forget to mention that SWITCH "I" in my schema is like the output pin of arduino.
SI2302 works with Vgs >= 2.5V, I will work with 3.3V in my arduino.
I have attached two schemas here:
1. one with arduino output LOW --> mosfet OFF, so solar panel current goes to the battery.Charging process.
2. antoher one with arduino output HIGH --> mosfet ON, so solar panel is shorted. No energy to the battery
Gate is connected to ground thorugh R25 to mantain mosfet OFF when arduino is off or missed(just in case)
(in the first schema, you have the solar panel model that you said and works perfect !!!)
So then, could be this a solution for low power panels ?

