Solar panels

Morningstar charge controller Renogy Wanderer 10A Charge controller

10W panel

32W panel

Charge controllers

Renogy Wanderer 10A

PWM charge controller, costs about $20 Should work fine with LiFePo4 battery (or any Pb battery)

https://www.renogy.com/wanderer-10a-pwm-charge-controller/

Serial port

I wrote to service.renogy.com support and asked for more docs and got a pinout. A good start.

They did not come up with protocol specs but there seem to be some projects that have implemented access to the controllers.

https://www.reddit.com/r/SolarDIY/comments/vxc8h1/renogy_wanderer_rs232_port/

https://github.com/BarkinSpider/SolarShed/blob/master/RenogyWanderer.py