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Small low-power photovoltaic MPPT module with LTO battery

This is an open-source hardware design, one of the modules from the MLAB labolatory system.


Battery module with LTO cells. This module was primarily designed for use in autonomous outdoor devices powered by a solar cell. This is possible thanks to the use of LTO cells, which have a wide range of operating conditions and require minimal care. The device can therefore work in outdoor conditions all year round (tested in Central European conditions).


  • LTO batteries (4x LTO1865) cells
  • 1.3 Ah (per cell)
  • MPPT tracker for LTO batteries charging from solar cell
  • Battery gauge for battery charge state measurement
  • I2C interface
  • LED indication
  • Output switching voltage regulator
  • Standard output voltage 3v3