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Four-wire Noctua PC fans are used for battery cooling. Details of PWM and tachometer operation can be found in Noctua’s whitepaper Noctua_PWM_specifications_white_paper.pdf.
Change Log
Revision 2
Carrier should provide isolated power to the AFEs, ideally at a voltage already equal to one of the required rails to minimize external components. 5V is much easier to provide than 51V, and can be dome with something like this J0505N-1WR3.
This is to satisfy regulations section 8.6.A.4 requiring that no loads be connected to the main pack before the primary fuse and relays. Currently the AFEs are being powered off the voltage taps from the main pack. While we have done this in the past and have not been called out for it, we wish to avoid complications at scrutineering.
Should add voltage monitoring for the aux battery
Passive protection for the aux battery is required to be in the battery enclosure as per regs section 8.4. This is a dumb rule but the fix is low effort so we will make the change.
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