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PowerFeather
See https://www.powerfeather.dev/ for hardware and SDK documentation.
It might be necessary to press the buttons RST and BTN to bring the ESP32S3 in boot mode for flashing, see Boot Mode Selection.
Therefore it is advisable to stack the PowerFeather on top for preserving access to the buttons.
Remember to add headers for the solar power input pins VDC and GND (Power Input).
When using BresserWeatherSensorLW with a PowerFeather, the SOC determines switching between eco and normal mode (sleep interval; soc_eco_enter / soc_eco_exit) and for switching off for battery protection (soc_critical).
I.e. the battery voltage thresholds (voltage_eco_enter / voltage_eco_enter / voltage_critical) used with other boards are ignored.
A thermistor can be connected between TS and GND (Special Function).
By enabling the charger IC's battery temperature measurement, the charging current will be reduced (eventually to zero) at high or low temperatures. See ESP32-S3 PowerFeather Capabilities and BQ25628E datasheet – Advanced Temperature Profile in Charge Mode for details.