Testing your circuit with a 1000 mAh battery
Parts are as for Solar carry-around node
but the following antenna instead Eightwood 868 MHz Antenne Kipp-und-Schwenkbar SMA Stecker NFC RFID Antenne 2 Stücke für Homematic CCU3 CCU2 CC1101 Raspberry Pi GSM Wireless WiFi Ham Radio MEHRWEG: Amazon.de: Elektronik & Foto
but with this box
100 x 60 x 25 mm Project Box: https://amzn.eu/d/3CvHqAF
To get solar panel out one just has to file away a small dent in edge of box where lid already has an indent.The hole for the antenna needs a 6.5 mm drill bit. Drilling it in one go in plastic is a bit much, start with a smaller hole and then use the 6.5 mm drill bit.
Stand is this DEDC Universal Car Jack Rubber Pad Square Jack Block Jack Pad Disk Block Rubber Pad Protector Adapter : Amazon.de: Automotive
Circuit is nice and small. Very compact build indeed. Not totally waterproof but enough to test the solar charging.
Update: this node did re-start after brownout with the circuit in this post. Another update: just as with some other solar battery management boards I use, when I put this node in a location that was very poorly illuminated, it was possible to re-establish bluetooth with the device, but all the settings had gone to factory settings, and so the node is not “spring on” for that reason.