WaveshareSolar Power Management Module for 6V~24V Solar Panel Supports Solar Panel/USB Connection Battery Charging Onboard MPPT Set Switch

This unit seems to do it all. Manages the battery, solar panel and the load. I'm using this to operate moisture sensors out at my garden. The solar/battery are powering a Wemos D1 mini microcontroller over the usb connection which then transmits the data to a server. It has all the needed indicators to show the status of the solar and the battery.Although the on-board holder is for a different lithium battery, there is an independent connector that can be used to attach an 18650. In fact, it's pretty simple to remove the holder and replace it with a holder for an 18650. It would be slightly longer than the board, but could be attached using some double sided adhesive, making it self contained. Or, the 18650 can be mounted separately inside the same housing as the Solar Management module and the microcontroller, leaving only the external connections to the sensor and solar panel.

Cant even pull .15 to .21 amps to run a esp32 from the usb port with full battery and solar connectiob from 100 watt panel. Waste of money. Did charge the 18650 i had connected to it. Thats really all its good for. Not sure if its reallt mppt either but not going to waste qnymore time on it.

After 1/2hr on 20W solar panel charging phone power bank all LEDs went into flashing and unit failed.

Well buildt and multi-purpose!

Small size, good performance what else could one ask for in a 3.7 volt charger.I will be buying this again.