363 karma · joined June 11, 2025
I suspect theres inductance and capacitance enough that even if the motors can't handle the voltage, it can be "clipped" until the pack comes down. (Especially since fmu these are 3phase AC motors, the motor driver is already regulating voltage and current to produce whatever the optimal waveform is)
Outside of Bribery and ?SarBox? (Whichever regulation handles kickbacks, etc), I can't think of anything.
The comment came out of knowing if the cable's a little dodgy the timing could be off- scrambling the PCIe signals (easier to just tape it off than look up if its supposed to matter and then tape it off anyway), and the fact my first HBA had the "QC pass" sticker prevent some lanes from connecting and the whole card was unresponsive as a result.
Another thing to consider is isolating all but the first PCIe lane.
Nobody seems to remember a bunch of companies receiving rather large fines for pulling known bull-crap "may contain sesame."
"Voc 37v @ 25*C"
Vs
"Voc 37v"
Edit: Isc is the same- max current.
I need to actually look up why the extra flux increases voltage. Maybe it really doesn't but just moves the MPP to a higher voltage by having more current.
DC starts getting really nasty to deal with somewhere between 36-52v, with 150v of panels not being something joe-blow should be able to buy on amazon. Designing these systems to be safe is difficult.
I wouldn't use anything but a bench supply stuck outside though.
The remaining 10-20% is above 3.8 and below 3.70v. 4.2v is the max to ever intentionally apply to a cell, and 2.5v is the minimum anybody specs as end of discharge.
As such- the "nominal" voltage is 3.7v or 3.8v.
Possibilities for 3.3v cut off include: LEDs' combined forward Voltage, a BMS set to that voltage, high drain applications pulling the voltage below a lower (potentially much lower at 10C to 50C discharge) cutoff voltage.
These are, of course, for NMC lithium secondary/lithium ion cells. NOT LiFePO4/LFP/LTO/Na-ion.
Theres lots of FUD, but most lithium stories are Li-Po cells (cell phones, RAdio-Control, laptops). Of the Li-Po's- most of them are for RC usage without any inbuilt protection.
LiPo's are beat treated like they're ziplock baggies full of 100mL of gasoline. If you handle them, I suggest buying an Ash Pot- their double walls give you a chance of containing a flaming pack. Best to just do it outside though.
spray-chalk on a stick.
I don't think I need to say more than: 98% of the code base was ASP.net backed by .Net FW 1.1, the rest was VB6.