As promised, I created some online 'Cloud' style monitoring at: http://www.goatindustries.co.uk/solar_gadgets/showdata.php

There's also a graph displaying battery volts on Gadget A, as below. This gadget's quite lonely at the moment as I'm waiting for more, updated, PCBs to arrive from PCBWay. Should have chosen express delivery. Never mind.

Another thing to notice is that the actual reading for battery volts is wrong. I believe this is something to do with the ESP32 analogue read and that a look up table needs to be created for the ESP32 D4 chip. I not really too bothered about it at this stage as the new PCBs have extra high tolerance 10M chip resistors for voltage sensing and so the data will change when they start to get used. I did try putting some smaller resistors in the bridge circuit, but they would leak current back into the MCU and try to turn on some of the LEDs!

For right now, the 3.7 V battery is fully charged at 4.1 V and is out in the sunshine absorbing electrons.

Here's the link for the graph: https://www.goatindustries.co.uk/amcharts/solar_gadgets.html  Don't forget to disable the browser cache or else it will never update.