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2017-07-28 at 12:36 PM #2297
The solar panel shouldn’t be connected to the USB port. Solar panels should only be connected to the JST jack labeled “SOLAR”. The LiPo charger circuitry on the Mayfly will use the solar panel voltage to charge the battery.
If you connect a USB cable to the USB jack, then the charging circuitry will use that voltage, and yes, the battery will be protected from overcharging either way.