I need some help regarding my project. I have made a dog feeder with Arduino Uno, which is powered with a 3000mAh Li-Ion battery. I want the system to be charged with a solar panel (more solar panels can be wired in parallel to increase current output), so I am using THIS module. However, I need loa…

Hi, How do you mean "load sharing"? Tom.. :slight_smile:

TomGeorge: Hi, How do you mean "load sharing"? Tom.. :slight_smile: I want the mosfet to be ON when the voltage from the solar panel drops below 4.4V, thus allowing the load to use the battery as a power source and the mosfet to be OFF when I have above 4.4V, so that it will charge the li-ion …

The orientation of the mosfet usually has the drain connected to the battery so the internal body diode of the mosfet will block current from coming back into the battery from the solar source when the mosfet is off. Also, the mosfet won't just turn on and off at a particular voltage. It will begin …

ShermanP: The orientation of the mosfet usually has the drain connected to the battery so the internal body diode of the mosfet will block current from coming back into the battery from the solar source when the mosfet is off. Also, the mosfet won't just turn on and off at a particular voltage. It…

As far as I know, there are no readily available modules for Li based cells that charge correctly under "load sharing" conditions. You really must isolate the battery, charge it properly, then reconnect it to the circuit. The Li cell must also be protected from over discharge. The MUCH BETTER alter…

Hi, Have you got the PV cell and actually measured its performance? I hate to burst your bubble but PV specs are derived in laboratory conditions so you will probably get 60 to 75% of the energy in normal conditions. PV cells are current generating devices and you are going to try and use it as a…

TomGeorge: Hi, Have you got the PV cell and actually measured its performance? I hate to burst your bubble but PV specs are derived in laboratory conditions so you will probably get 60 to 75% of the energy in normal conditions. PV cells are current generating devices and you are going to try an…

garabetov: Thanks for the reply. So as I have understood, the option to use the Arduino's analog pin to read the solar panel's voltage and turn ON/OFF the mosfet won't work? The solar input to the battery charger is not an issue as the charger outputs fixed 5V, so I can't figure out how using a bo…

I'm stumped on how to make load sharing work with solar. But I have a possible solution to the basic problem you have, which is that charging does not terminate. If you desolder the TEMP pin (pin 1) on the CN3065 chip from ground, and instead connect it to an Arduino GPIO pin, then connect the posit…

Help with li-ion solar charging with load-sharing

Projects General Guidance

TomGeorge May 26, 2020, 6:47am 20

Hi,
Internal Diodes added;

Tom..

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Help with li-ion solar charging with load-sharing

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