Category Archives: renewable

Arduino BMS cell balancing PCB for LiIon and LiFePo4 battery cells

This is the first release candidate RC1 of my open source arduino BMS cell balancing pcb for LiIon and LiFePo4 battery cells.

Cell balancing pcb’s are connected in parallel to the arduino BMS controller shield (comming soon, check out my Danish version of this site to follow the developing process, first 09beta version running now)

Functions in RC1 cell balancing PCB:

  1. Detects Vlow (ca. 2,85 volt) and opto coupler patch info to the arduino based BMS controller
  2. Detects Vhighhigh (4,2 volt) and opto coupler patch info to the arduino BMS controller
  3. Balancing the cell at Vhigh with a load resistor, switched on with a Darlington transistor

This cell module can be used for electric vehicles with LiFePo4 batteris, just by changing some configuration in the arduino sketch, and a few components on the arduino BMS controller shield.

Continue reading

Share Button

MPPT arduino solar charger cooling fan

This MPPT solar charger is build around Tim Nolans open source MPPT solar prototype project. I made a print layout for the MPPT solar charger, and below you can se how the mechanical mounting was meant to be. Continue reading

Share Button

windmill model

This windmill model is a pre experiment for a offgrid DIY VAWT windmill.

The next experiment will be a slightly larger model of aluminum and mounted on the shaft / bearing from a scrapped ceiling fans. There must then find some neodymium magnets and wound some coils which must then be made ​​into a simple administrator. Continue reading

Share Button