Search results

I had a similar problem: no software updates were applied, and the battery drained 6-8% per day. Other symptoms were contactor activation every few hours (presumably charging the 12V battery) and the inability to reset using the steering wheel controls. Resetting by changing the wheel size...

Yes, they do. It's in the manual. I've read that turning on the brake lights is based on the G force of the deceleration, rather than a simpler metric such as regenerated power. That's going to be much more predictable for following drivers than with an ICE vehicle. I can slow pretty...

There is relatively little risk using high cross section aluminum conductors. The problem, and the source of aluminum wiring's bad reputation, comes with branch circuits using small solid aluminum wires. It's still 'legal' (code conforming) to use 8 AWG and larger aluminum wire. It's...

To echo this, the home inspections I've read did include multiple issues that 'appeared to be' NEC violations. They also had a disclaimer that not all flaws had necessarily been identified, and that not everything identified was necessarily a code violation. All of the inspections had...

The commercial Chargepoint systems e.g. CT4000 can use several different networking types. The typical installation will have mostly non-gateway chargers that communicate over 2.4GHz WiFi to a gateway model that has an additional 3G or 4G modem. Internally they have provisions for several...

Note what happens at 15:20. It's not on cruise control, it's coasting. That is the result of the traction/stability control giving up and turning off both traction control and regeneration.

A tire rolls on its reinforcing belts, not on the outside diameter. With different size tires you have a much different reinforcing belt diameter. This is very different than the previous situation, where the same size tires had different wear. Even with different height tread blocks they...

A DC fast charger isn't exactly what you are imagining. It's a variable voltage DC supply. If you are starting with DC, you are doing a conversion that is essentially DC-AC-DC. Everything that makes for an efficient DC-DC converter e.g. synchronous rectification, resonant magnetics, etc...

I know that this is probably a joke, but the identified layoffs are for people doing mundane things rather than the UI software. The employees in San Mateo were doing manual annotation for classification training. They were identifying objects (trash can, box truck, discarded refrigerator...

My understanding is that the cooling compressor uses traction battery power, but the ventilation fans and (most) electronics use "12V" power. So if you are using fan-only overheat protection you won't be using any traction battery power. The 12V supply is cycled, but the on-board charger is...

The benefit of leaving the vehicle constantly plugged in is that 'housekeeping' such as interior overheat protection and sentry mode aren't powered by cycling the traction battery. There are research papers that suggest the best state-of-charge for storage is more than half, some concluding...

The regulations around underground tanks changed about 35 years ago, with a decade of notice. The effect was to put most 'service stations' out of business. Those were service shops with two or four pumps out front. They relied on both aspects to make money, with entry-level mechanics pumping...

Automotive tooling is usually serviced annually, which typically means inspecting for cracks and polishing. That schedule is driven by production line shutdowns, not a specific service interval. Erosion can be fixed with welding, spray welding and selective plating. If that needs to be done...

Conduit does not trap and focus heat. It allows better cooling than the alternative of using non-metallic (NM) sheathed cable. NM cable is derated to the 60C equivalent, despite using insulation that would otherwise have a 90C rating, because the tight PVC sheath insulates more than the loose...

Car electronics are designed for over-voltage conditions. One of the tests is explicitly targeted at the mostly-obsolete practice of tow trucks using a 24V electrical system and long jump start cables. The voltage drop of the wires isn't a problem when you start with double the voltage. The...

That's an excellent idea -- hopefully Tesla takes note of it. Tire pressure history could be really useful, especially if combined with an analysis that corrects for the current temperature, estimates leakage, and alerts when the leakage changes. Most people would appreciate information such...

It doesn't matter. It's more important that you keep the battery in the midpoint of its charge. The battery longevity is maximized if the charge is kept between 30 and 90%. Ideal is probably 60-70%, but the improvement is so minor that it's difficult to measure. Minimize the time with the...

That opens the possibility that there was a swap along the way. Perhaps someone thought that it would be cool to have white inserts with a black interior and paid for an exchange.

This isn't accurate. In most California regions you are simply required to have a shut-off nozzle on the hose, and make sure that soapy doesn't directly run into a storm drain. That's a pretty reasonable regulation, and far from banning washing your own car. I can see the viewpoint that it is...

NM cable can be run conduit for a short distance to protect it from damage. When you do that the conduit is called a "sleeve", because running NM cable in conduit raceway is not allowed. A "Short distance" is up to the local inspector. Typical rules of thumb are a few feet, up to the...

That was an interesting paper, but it doesn't apply here. They were talking about their own grid-integrated system. They had designed the car's inverter, one that both charged the EV battery and supplied power back to the power grid. Part of the paper was writing about how efficient their own...

You might have drawn the wrong conclusion from that story. Charging from 120V is significantly less efficient than charging with 240V. Both because of resistive line losses, and because the on-board charger has to boost the voltage more. Higher boost ratios tend to be less efficient...

I didn't know about the CLA, so I looked it up. The announcements seemed to broadly claim that the CLA would have a Cd of 0.23, and a specific edition would have a Cd of only 0.22. https://www.motorauthority.com/news/1082226_mercedes-claims-its-cla-is-the-worlds-most-aerodynamic-production-car...

Which part is wrong?

Yes. MC cable can use the 90C temperature rating of THHN, so it supports 75A. You may use a 60A breaker or 70A breaker, since 75A breakers are less common. Why are you choosing MC cable? Do you live in Chicago?

The single piece rear casting, which was first seen on December 2020 deliveries from Fremont, was a production block for the 7 seat option. There likely wasn't a fundamental reason for tying those together, just that the factory didn't want to modify the older two piece tooling when the new...

A reminder that the original post on this thread claimed that Tesla had "officially issued a production halt". That turned out not to have been the case. It's just the usual delivery schedule, with some ordered cars taking longer than others rather than customers being served in strict sequence.

Those castings might be for cybertruck production, or at least refining the tooling for it. The "front casting" we've seen recently doesn't look as if it's for the Model Y. It might actually be for the CT. There is video of the first Austin press dry cycling. It took three months for Fremont...

Reconsider running the wiring out from the side of the load center that is against the stud. You will need to clamp NM cable or attach the conduit, which means drilling an extra-large hole centered on the knock-out. It's more common to run the wiring from the top or bottom and then through a...

A structural battery module isn't an integral part of the chassis. It stiffens the chassis, just as a bonded windshield does. The 4680 cells should fit into a module that is the same form factor as the 2170 cells. Presumably changing modules will require no changes to production.

I expect that the 4860 cells will be similar to the single piece rear casting. The single piece casting simplified manufacturing, but had negligible customer-visible benefit beyond enabling a 7 seat option. People here wanted it, but almost no one else cared. There is no indication that it...

So... how does that integrate onto an integrated circuit? (Answer: not at all.) An AM antenna is comparatively expensive because it needs to be longer than the other antennas and thus needs to be substantially different than the WiFi, Bluetooth and cell antenna. It's not that would have been...

You might consider training yourself to not use Creep Mode. Creep mode simulates a trait of early automatic transmissions that was never fixed. Instead of a simple mechanism to eliminate it, the flaw was passed off as a feature, and people now just accept it. Imagine if it didn't exist and...

A full FM receiver can be integrated onto a radio chip with little effort. It's standard 'for free' on most of Broadcom's WiFi+Bluetooth chips. An AM receiver requires a physically long antenna, and likely some simple but comparatively large external components. It might also require an extra...

I'm well aware of the pairing -- see the first line in my post.

There are definitely slow chargers. They are unrelated to charger pairing or battery temperature. I took a 2K mile road trip last week and encountered several Supercharger locations where I got a much lower charge rate than I expected. Moving spots solved the charge rate problem. In some...

A reminder that the on-board charger is limited to 48 amps / 11.5 kW for long range (including performance), and 32 amps / 7 .7 kW for standard range. https://www.tesla.com/support/home-charging-installation/onboard-charger The Gen 1 Wall Connector provides up to 80 amps, but no current 'on...

Bottom line: From the activity at the factory I think that we can conclude that production has not halted.

The service advisor said "burnt a lot of Model Y parts". The rear casting wouldn't burn. Plus we know that the fire in early March didn't keep the factory from hitting record production levels at the end of the quarter, and then filling the lots for overseas shipments in early April.

The fire was localized to the Gigapress structure. It was reported to be minor with negligible damage. Even if we disbelieve that statement, the only parts made in that section of the plant is the large rear casting.

I'm certain that Tesla is using old chip technology. Automotive quality requirements favor older, well-tested fabrication processes. And most automotive chips are quite simple.There are a few chips that are close to state-of-the-art, but most are doing mundane tasks that were easily done two...

That's not impossible, but it would be extraordinary. Extraordinary claims require extraordinary evidence, especially when rumors like that can move the stock price on a heavily shorted stock.

I disagree. It merely needs to be close enough in specs, attractive, and different than what everyone else has. Once you are a viable alternative, not screwing up for a few product generations will put you in the lead.

I had to wait yesterday morning (Saturday of Easter weekend) at the Cabazon California supercharger on I-10 between LA and Phoenix. There were only two cars in front of me; the wait was so short it wasn't worth noting how long it took. The car that joined the line behind me might not have come...

There must have been something else on the circuit drawing power. House circuit breakers are thermo-magnetic. They will trip either magnetically from an instantaneous current surge, or thermally from long-term heat build-up with a moderate overload. The latter is less likely to occur with a...

You need to learn the terminology to read any standards document. That includes the NEC. You might want to review and revise some of your previous posts.

The new U.S. government support for EV charging infrastructure is going to force a decision. Tesla has the biggest and best DCFC infrastructure right now, but the government isn't going to subsidize a proprietary system. That means all of the money is going to install CCS1 chargers. Once...

I think that might be an old interpretation. If you are over-sizing the conductors for the breaker and application, you might not need a thicker ground wire. Edit: This is certainly something you will want to double-check with the inspector. The intent might be avoid someone later installing...

Errmm, are you certain about? The grounding wire only need to be sized for the breaker, not the other conductors. (I'm guessing that you actually mean "if you upsize the wire and breaker to more than 60 amps, you'll also need to increase the grounding conductor size". Edit: Or you might be...

You will want bigger conduit. The Gen 3 wall connector has punchouts for 3/4" or 1" conduit. The Gen 1 wall connector only supports 1". If you are close to the fill capacity on the table, use the next size up. 1" is *far* easier to pull through than 3/4". Consider running a pull line in case...