this post was submitted on 21 Jun 2023
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Year-round Solar Water Temperature Sensor (imgur.com)
submitted 1 year ago by kaedon@slrpnk.net to c/diy@slrpnk.net
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A small solar power system to run a LoRa water temperature sensor year round. Here's some pretty graphs of the data:

https://www.kaedon.net/mitigomish/watertemp

This is a project that's been running for almost 2 years now. Everything is still working with very little down time! The solar power system is way overpowered for what it's doing, but I wanted to make sure it works through the dark winters.

The temperature sensor is at the bottom of a bucket in the ground, because the water level gets pretty low in the winter and I didn't want the ice to destroy the temperature sensor when it drifts.

Any thoughts or suggestions for improvements are welcome!

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[–] cybermatrix@slrpnk.net 1 points 1 year ago

Nicely made! You have a small lithium or lead battery in there? Also can you read the voltage of the battery the whole year? I am interested in the survivability on the winterdays. I am living in Lithuania where the winter sun hours are very short and sometimes with days of overcast. But i would like to build solar powered tech that can survive in winter. Also interested in using capacitors instead of chemistrial (if thats a word) batteries.