Love this! Your the greatest man, truly inspiring. From Milwaukee Wisconsin U.S.
There could be an issue if the battery protection turns off the battery (eg overvoltage) but CN3791 still is in constant voltage mode:According to datasheets:FS312F: overvoltage protection 4.225 - 4.275VCN7391: overvoltage at 4.2V +/- 1% -> max 4.242
CN3791 has no battery detection thus leading in a ripple waveform in the output.
Also if the battery is over discharged, CN3791 blocks until threshold is reached. Unfortunately the battery will then never be connected to the charger. So a undercharged battery will not charge.
This could be avoided to connect the charger directly to the battery. The overcharge protection would then only disconnect the load though :-/
Am i right to choose the voltage divider for mppt pin (R8, R9) according to the maximum Voltage of the Solar panel? Thank you for this project!
I looked at your circuit and I saw something I don'tunderstand: Resistor R3 part of a voltage divider for boost converterfeedback has an incomplete circuit to ground, It shows as an incompletetrace in the PCB editor and from what I understand, the finished board couldnot function like this ?!?
It´s a good job, but why the resistor R3 is not connected to GND?, Is that dangerous for the PCB?
@josuemele01 https://easyeda.com/hichm/SolarLiPoChargeProtectBoosti do update, R3 linked to GND
Here, this article mentioned solar powered power bank circuit with over charge and over current protection. ( TP5086 IC module)
Great idea !!
It will be perfect for a camera on a pole that can be off-grid and uses a wireless link.
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