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SolarLiPoChargeProtectBoost

10 months ago 5464
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SolarLiPoChargeProtectBoost

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Comments (3)

Stupidn3rd Reply

Love this! Your the greatest man, truly inspiring. From Milwaukee Wisconsin  U.S.

vkbs Reply

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 - 4.275V
CN7391: 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 :-/

mrRo8o7 Reply

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!

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