Recent content by magnet

The iwatch is going to be released with a solid state battery very soon using a process developed at applied materials. Still too expensive for most applications but I'm guessing we will see solid state EV cells in about 4-5 years. The gigafactory cell is going to be 4.9V max NCA with a 1/3rd...

The big question is can the Tesla connector do Vehicle to grid as well as CCS? It seems possible with both AC and DC pins CCS maybe be able to DC charge from solar/dc_converter and be grid tied at the same time. I would like Tesla to also enable vehicle to vehicle charging. Tesla (JB) has said...

you are forgetting 4 wheel torque vectoring EVDrive Electric UTV Terra Torque Drive AWD Torque Vectoring Technology Demonstrator Video on Vimeo

The panny nca data sheets say 3.65V nom it is a 3.3Ah cell pack is over 85kw but you can only pull about 80kw out (in the car). This is "brick insurance"

Just curious? What is the longest time your car has spent fully charged in range mode? Overnight? A few days? Less than an hour?

A Bit About Batteries | Blog | Tesla Motors The other significant factor that affects calendar aging is the charge state of the battery during storage. At higher charge states cells lose capacity faster. This is a second reason why we have limited our maximum state of charge to 4.15V/cell...

Average and minimum brick Ah should will correlate very closely in a normal pack. This does not support your theory at all and I don't see any evidence of a sudden drop in capacity. All: I wouldn't waste your time on this anymore. This guy is just setting himself up for a lawsuit against...

Sound pretty normal to me. NCA cells drop to 75% after a few years and then stabilize and flatline at 70%. Mileage does not mean much. Calendar life means everything. Imagine for a moment your car has 70% capacity after 20 years? Have you established that brick 8 is in fact an outlier? Every...

Clearly the x-ray tech was talking about EM fields. Better not ride an electric bus, trolley, hybrid train, hybrid ship, etc designed with no shielding in mind like today. If no connection between riding the trolley and cancer has been made yet in over a century of use, it never will be made. We...

I think the pack come close to doubling the torsional rigidity of the Model S chassis when installed in the vehicle So it is not dead weight like most other EV packs. Also remember it has been designed for robotic swapping and to serve as a ballistic shield.

Great question :)

Look I said it was not truly lossless but if you want to know more about this type of balance schemes those are the keywords. Even true shuttling is not truly losses. What Tesla has done is approach lossless balancing without resorting to real shuttling. If it was simply lighter use of the bleed...

that is simply what you think. it is not that simple. it in effect increases the voltage to bricks not only reduces. and it balances module voltage as the bmb uses power. more balancing uses more power. there is no such thing as lossless balancing of course but that is what this schemes are...

Yes! You get it! This the "active impedance" control is only enabled towards end of charge when the charge is slowing the the string voltage is more stable. Is it totally lossless? No of course not. But is is safer than true shuttling and it is more efficient than simple bleed balancing.

Yes. Each BMB on each module has it's own target balance voltage (TVB) for each string in the module, but each BMB also sends it's highest TBV value to the BMS which then resets the global highest TBV of all the modules. Shuttling is a bad way to describe what is going on. You could call it...