Vectrix Inrush Current Limiter (ICL)

An Inrush Current Limiter (ICL) is an essential piece of equipment used to pre-charge the components on the Vectrix VX1 Motor Controller Board each time when batteries are connected again (after service or repairs to batteries or motor controller board).

Incorrect use of an ICL and unsuitable ICL designs will probably damage the main fuse.
The fuse can then suddenly fail during normal vehicle operation at some time in the future.

This thread will hopefully cover these topics comprehensively and might culminate in the development of a suitable, open source Vectrix Inrush Current Limiter design for the VX1.

The Inrush Current Limiter needs to slowly charge the capacitors on the Motor Controller Board (MCB) without causing a high current spike through the fuse. Once the capacitors are charged, the two parts of the 125A Andersons connector (blue) can be plugged together.

Below are some pictures of the capacitors on the MCB and an overview of the MCB. Click on them to enlarge.
I am not sure yet which of the capacitors are actually the ones getting charged when the battery is being connected. Maybe some, maybe all, this would be a question to be answered by the electrical engineers or other smart people reading this page.

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Please reply if you can explain this in more detail!