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FW version: Stable

Will controllers work with more than 20S Li-ion battery?

The short anwer is NO.

The longer answer is still NO - Always read the datasheet of the controller you are using. The maximal voltage is specified there.

warning
  • The maximal voltage is different for each controller. Always read the datasheet.
  • If you exceed the maximum voltage, you can damage the controller. The warranty does not cover this damage.
  • siliXcon will not help you exceed the maximum voltage.

The longest answer is still NO, but why?​

You may ask, if you are using 100V MOSFETs, why can't you use a 100V battery? This is due to voltage overshoots during the switching of the MOSFETs. During the switching, the voltage can overshoot by 10-15V (depending on the controller). This means the MOSFETs can see 100V with 84V battery. If you use a 100V battery, the MOSFETs can see 120V, which is above the maximum rating of the MOSFETs.