Basic temperature controlled relay on Raspberry PI that used temperatures from Victron Cerbo generic sensors.
Relay: https://www.amazon.com/gp/product/B0BJBDWMM2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Raspberry PI Power: https://www.amazon.com/dp/B01MEF293V?psc=1&ref=ppx_yo2ov_dt_b_product_details
Ruuvi Tag: https://ruuvi.com/ruuvitag/
Raspberry PI 3, 4, or 5