[craig1f]

Tesla monitors battery degradation based on miles driven. If you use your battery as a stationary power source, it messes up their ability to anticipate degradation. So it makes sense.

This is, from the warranty's point of view, the same as manipulating the odometer on an ICE car to make it appear to have driven fewer miles than it actually has.

[ComputerGuru]

> This is, from the warranty's point of view, the same as manipulating the odometer on an ICE car to make it appear to have driven fewer miles than it actually has.

Your first paragraph is spot-on, but your second claim couldn’t be more wrong. It’s akin to powering your home off your ICE car’s alternator and an inverter which wouldn’t register as miles driven on the odometer.

[ganoushoreilly]

It's also why a lot of trucks now display IDLE run hours on the engine in addition to in motion/drive hours.

[protomyth]

In addition, Ford added a whole electric generator solution https://www.roadandtrack.com/new-cars/car-technology/a329701...

[caturopath]

> the same as manipulating the odometer on an ICE car to make it appear to have driven fewer miles than it actually has

Well, no, this is the same as running your ICE car a lot without driving it. (Which is actually common for some ways people use cars.)

Some cars and all-ish heavy machinery count the amount of time the engine is running. (It's not common for cars to base their warranties on this, but only calendar time and miles, as far as I know.)

[_ea1k]

I'd think it would be more like hooking the driveshaft of the ICE vehicle to a generator and running it under significant load.

No miles would register but you'd still be putting a lot of wear on the engine. I doubt the warranty for the ICE vehicle would cover this.

[StillBored]

Sigh, this is not at all how most trucks/etc work.

The odometer is generally computed/measured at the output shaft of the transmission. The differential+tire size is then used to compute a mileage in the ECU (or old school via actual odometer gears feeding the odometer).

Its also why the discussion about adjusting ones odometer comes up frequently in offload communities where oversized tires, or differing gear ratios are run. Even outside of that, people (like myself) who run slightly oversized AT tires, even on the street have our odometers thrown off by a couple percent because the manufactures frequently don't provide a real number input to the ECU rather a selection of a few tire sizes. In my case, my truck has metric sized tires, which don't align perfectly with the preprogrammed LT sizes.

That is why there are various inline devices which can be plugged in to correct for nonstandard modifications (I believe this to be one of them http://hypertech-inc.com/SpeedometerCalibrator.aspx, from a random google search)

[_ea1k]

I didn't understand your reply until I realized that I had specifically mentioned the driveshaft. On those vehicles that you mention, it'd be much harder as you'd have to drop the transmission and connect to the crankshaft.

Not impossible, but probably not practical and certainly likely to void various parts of the warranty.

[hef19898]

Depends on the vehicle, stuff like older defenders and generally land rovers had a connector on their transfer cases for that purpose. Obviously none of those are covered by any warranty any more, bit I wouldn't be surprised if there are new vehicles like that out there.

In all these cases that would be intended use, so.

[_ea1k]

Interesting, I hadn't heard of that but it does make sense.

[kop316]

Reread the article. This is not a person trying to hook up a power source to the primary Lithium Battery, it is someone hooking up an inverter to a 12v lead acid battery that their Tesla also has.

[FireBeyond]

> This is, from the warranty's point of view, the same as manipulating the odometer on an ICE car to make it appear to have driven fewer miles than it actually has.

No, one implies active deception. The other is "unaccounted for use case".

This is (another) example of Tesla expecting customers to not just collect data for them, but pay for the privilege - witness the replacement of the eMMC which Tesla considers a consumable despite its inaccessible location and despite the fact it is not the owner "consuming" it, but Tesla, capturing telemetry data to send to Tesla for Tesla's benefit.

I rather doubt there's anything in the Tesla Bill of Sale that obligates me to provide battery health telemetry data to Tesla for their monitoring.

[loceng]

Tesla is planning for a system where your vehicle is charged at home, and can power your work during peak hours, and they want your vehicle to be a backup power supply - so they will eventually allow this, however regulation will be required to make sure people/consumers aren't getting unfairly treated.

In the end it will need to be competition and regulation that prevents all EVs, the industrial complex, from taking advantage and extracting more than is reasonable based on costs.

[sudosysgen]

That's completely stupid. Tesla can and I'm fairly certain has the data on the exact number of amp-hours that flowed through each cell.

If they are going to void the warranty anyways, they can simply calculate the equivalent miles driven with the amount of Ah used and use that as a basis for voiding or not.

[Demigod33]

There may not be a good equivalent in case the load is different enough from normal use.

[sudosysgen]

I assure you, no house has worse load characteristics than a car.

Assuming the load characteristics of a house are the same as a car is a pessimistic assumption.

[Demigod33]

It does not even have to be worse to be a problem. Maybe the battery requires certain loads and capacity at certain times to work efficiently and not age as fast. There are too many unknowns.

[sudosysgen]

This is not how Li-Ion batteries work.