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  1. I

    "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...

    As luck would have it the pinouts of the MCP1x1 are the same; as is the pinout of the SOT23 version of the TC54. Looking at the discharge curves of the Headway cells,cutting off at 2.3V will only lose a few percent of capacity at room temperature. I won't be cycling when its too cold! Your...
  2. I

    "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...

    I'm looking to build a Zephyr BMS for 12 Headway LiFePO4 15A cells, but the through hole version of the 2.1V TC54 is obsolete (well you can get them from MicroCHIP Direct after 3 months). So two options: 1) substitute with 579-MCP111-240E/TO, but this has a cut-off voltage of 2.32V (I'm okay...
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