Hi, My project is a solar driven cubietruck for 24/7 with a 5volt 1.5A solar panel and 3.7V / 27.2Ah li-ion battery.
When I measure the inut voltage (and current) via "/sys/devices/platform/sunxi-i2c.0/i2c-0/0-0034/axp20-supplyer.28/power_supply/battery/voltage_now (and current_now)" and my battery is charging, I see the input voltage from the solar panel drop to 4.0 volt, sometimes to 3.7 volt on cloudy days. I think that at these conditions the axp209 just switching betwen charging and discharging, so the 3.7 volt input is just "helping" the battery to power the board. So my question is, is there any way to implement an MPPT (Maximum Power Point Tracking) approach? When a battery is connected, measure the input "I" and "U" to get "P" and increase "I charge" until input "P" goes down and decrease "I charge" in the same way? In that way it would be much more efficient. Greets, mike PS: This is my first post here, I apologize if I did something wrong to post my idea/question here. -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
