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I have worked/designed with relative high power MOSFETs (10Amp, not 24) a few years back. They are not the low efficient at low load devices anymore. Plenty of designs which work fine at low loads/good efficiency. Switching frequency is way higher, much lower Rds on resistance and lower gate...

I am no Tesla design engineer so this is speculative; Yes there are two parallel 24A units. I speculate/expect these to work in parallel each take a portion of the charge so _not_ one takes it up to 24A, then the other kicks in. In a former life I did a triple redundant PSU design (a little...

Affected series (PWA or SNR of MOSFETs/boards). Must admit I can't find the dang reference where I read it or how I came about it.

Tesla has made no statement as to the causes of the failure - so all stated reasons are speculation. That said, as an EE I feel I can speculate a bit more specifically (grin) if that makes sense? Also there is this msg...

In a way yes. The thermal fatigue on board/mosfets is driven by repeated heating/cooling cycles. If the board/mosfets aren't used (as is mostly the case for DC charging) they wouldn't see that degradation. In the case of PCS it is not '"normal" wear and tear but the failure is due to...

(grin) Funny, the EE in me said the same thing - I can even reflow in my own oven. It is a little hard to believe that they would have cold solder joint issue, one of the more simple things to do right and inspect for. Anyway, I wouldn't attempt to do a reflow - have you seen how big them...

Tesla designs practically all aspects of their cars though they do not manufacture the electronics (PCB, stuffing etc), I believe that is mostly done by Flextronics and Sanmina for power electronics. I don't think there is any software involved in this failure mode. The PCS failure mode may be...

I don't know what the precise failure mode of the component is that has the MOSFETs. In general, MOSFET junction temperature has an influence in longevity so going with say half the permissible AMP charge level would significantly prolong their live. Then again, there are tons of other...

Reading the patent application, the claims are not limited to wheeled/towable configurations. The independent claims state “managing a plurality of battery packs via OCV matching, parallel charging, SOE/OCV strategy switching” etc. None of that logic references physical form factor, mechanical...

he stated his “Procusional patent was approved” likely a typo for provisional. That is a little weird as those don’t get approved. It is not “patent approved”, i.e. granted language which would be a real issue for him. But best to tighten up his text.

Provisionals aren't the actual application as you point out, however, the person/company filing for a provisional may legally state "patent pending" The USPTO also states this directly on the provisional application page. https://www.uspto.gov/patents/basics/apply/provisional-application...

Exactly. "Patented pending" is permitted once a patent is applied for. The application number doesn't show up in the USPTO database immediately so could be this was a recent application. Getting a patent on a chemical composition is rather difficult and it would surprise me that anyone besides...

What is the patent application number?

Pulled up next to another cyberbeast, looked over and saw other pilot did the same. We admired each other for a sec, then i flipped him the bird. Took him a sec, then laughed, and i got a bird back. Yeah, thats a good bird….

124 / 0.469 =264 (total mi in batt if continue to drive with this usage). You trip computer says 49pct of capacity used so: 264 * 0.49 = 129.36 mi driven.

Ah yes, no not likely the battery level then. I too have had a few issues with the key on the CB as well as M3 (iPhone app). But this was just not being able to open the car. At several times I had to just the keycard like an animal. That app could use a bit more polish for sure.

Is it possible your phone battery was rather low? BLE may get funny at low levels. Open car vs drive authorization i believe are independent key requests from car so one could work and thr subsequent request may fail. Just a thought…

He’s sure he didn’t do it. Some other dog came in and started scratchin’ and left just before you could see him :-)

Lower production costs

ouch, gives me trypophobia...