A 500W+ solar charge controller. It can charge a 12V batteries with+40A. Want wireless? No problem!! the Seeed Xiao ESP32-C3 has your back..
The idea is to basically monitor our rooms continuously and if no one is present in the room, the system will turn off the lights and fans.
Gutters to Gardens is a solar powered rain barrel for remotely or automatically activating a water distribution system for home garden beds.