Low voltage solar/wind/ other generator hybrid charge controller - power conditioning circuit development board *version 1), and version 2 with built in charger.
MPPT (Maximum Power point tracking) using ST's SPV1040 IC
0v charging function to regenerate over-discharged batteries that can no longer be charged with conventional chargers.
0.3v - 30 volt in AC or DC
5v Out
Temperature sensor for over and under temperature protection
over voltage, over current, over discharge protection
Constant Current and Constant voltage charging
still a lot of issues need to e resolved. e.g. wrong placement of load in relation to charge protection IC (BQ2980), footprint wrong for SPV1040... etc. Issues in Bill of Materials.
Designed as part of the Windternet Project with Regenerative Energy Communities + Solar Internet, where we are wanting to run a raspberry pi 0 server on the experimental farm "VXO Farmlab" in Sweden.
https://regenerative-energy-communities.org/
Check out the latter for documentation on the low energy server side of things.
space for both 18650 batteries or LIPO with JST connector;
The plan is to regenerate over-discharged batteries with renewable energy. We find a lot of 18650s in the e-waste bins.
We made a large input voltage range to allow for many different types of generators; specifically we wanted to design for e-waste motors and other discarded materials (e.g. magnets from harddrives and copper wire from old relays) to be reconditioned into wind generators.
PCB manufactured by PCBway. SMD components reflow soldered on standard kitchen hotplate with low temperature solder paste. We have been trying out using mycelium as a material for turbine blades- documentation can be found here: https://titipi.org/wiki/index.php/Unfolding:SporesandMore
A massive thanks to Urs Gaudenz GaudiLabs for the support, assistance and motivation in designing these 2 (my first 2) PCBs.