On this video I show you a simple and very cheap way to get your node out in the open and solar charged, if you live in a dimmer climate no reason you cant daisy chain these units together to get the unit to be totally self sustained.
Here are the Links to the parts that I used, im in the UK the source for your country of origin may be different.
https://www.amazon.co.uk/dp/B07L2PH535?psc=1&ref=ppx_yo2ov_dt_b_product_details
https://www.amazon.co.uk/dp/B07MM1NHHL?psc=1&ref=ppx_yo2ov_dt_b_product_details
https://www.amazon.co.uk/dp/B0846KH4RP?psc=1&ref=ppx_yo2ov_dt_b_product_details
https://www.amazon.co.uk/dp/B0B1M8P1R7?psc=1&ref=ppx_yo2ov_dt_b_product_details