• Balancing video

    Michel Kuenemann05/26/2017 at 12:38 0 comments

    This 2 minute footage shows balancing in progress.

    Explanations are embedded...

    Conclusion: balancers validated...

  • 15 balancing modules installed this evening

    Michel Kuenemann05/21/2017 at 20:50 1 comment

    I managed to finish the assembly of the balancing cards today and I installed them seamlessly on the battery modules. The result is really cool. Performance tests are in progress.

    General view of the 10 kWh string:

    Each (70-element) module is equipped with a balancing card placed on top of it. This card continuously measures the module voltage and starts to dissipate power whenever the module voltage crosses a certain limit (can be setup up to 4.2 Volts).

    A close up on the modules

    The first things to notice are the "large" 60 x 60 x 10 mm fans. Thanks to them, each module is capable of a 50 watt continuous power dissipation. The square components with a black on white hexadecimal figure on them are the BlueTooth Low Energy modules (Zentri AMS001). Each BMS card is managed by an NXP LPC824 Cortex M0+ microcontroller featuring a very clean 12 bit ADC, among many other cool things.