I’ve got a specific project for a sensor network and we are going to need a power supply for the sensors. Each sensor has three or more Pi 4Bs, drawing around 5w each. Right now we are experimenting with Jackery Solar Generator 300s and they seem to more or less work. The Jackerys aren’t rainproof and aren’t really made for standalone use (these sensors need to be continuously online).
We are wondering about a custom solution that would have the following features:
- Expected power draw is 15-20w. However, sometimes it might be quite a bit less and we don’t want to be bit by any auto-shutoff function (the Jackery system automatically shuts power off after it is below 10w for six hours). Future designs might draw much less power.
- 300wh-500wh battery. Ideally we could swap out batteries for different sites and different applications.
- 100w solar panel.
- A software interface (probably over USB) to get the battery charge status and how much power is coming from the solar panels.
- We’d want this system to run fine in the field for 4-6 months.