50 million batteries - range extender update

[rrolsbe]

There are 4 BMB, one per 200V module. Along with the High Voltage Controller that oversees everything and runs the series/parallel switch.

Thanks for the info!

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[mongo]

Thanks for the info!

Sure thing! You can review most modules and circuits (not so much the pack itself) at https://service.tesla.com/en-US/vehicle-models/Cybertruck

 

[HaulingAss]

5 miles per day is 1800 miles per year. If that was an ICE truck that is the equivalent to 120 gallons per year. Probably a 2 year payback. I could see 1000 + watt arrays that fold out and track a little. I can't wait for people to hack this.

You can't calculate payback periods for solar using the cost of gasoline. Because it's so easy to plug into an electrical outlet. Having put my Dual Motortruck through it's paces, I've confirmed I have zero need for a range extender. Maybe if you have to drive 85 mph everywhere you go it woud be handy, but in my part of the country that's just not practical unless I'm on a Superhighway like I-90 which is very well covered with Superchargers anyway.

 

[Tinker71]

You can't calculate payback periods for solar using the cost of gasoline. Because it's so easy to plug into an electrical outlet. Having put my Dual Motortruck through it's paces, I've confirmed I have zero need for a range extender. Maybe if you have to drive 85 mph everywhere you go it woud be handy, but in my part of the country that's just not practical unless I'm on a Superhighway like I-90 which is very well covered with Superchargers anyway.

There are several ways to estimate payback. Comparing to ice is just one.

I won't take my M3 on a road trip to Northern Idaho. Too much planning and time. In a couple years it will be easier. 400 mile range would help a lot now.

I am so spoiled and guilty for changing at home with $.10 power. Supercharger rates are almost comparable to gas aren't they?

 

[rrolsbe]

There are several ways to estimate payback. Comparing to ice is just one.

I won't take my M3 on a road trip to Northern Idaho. Too much planning and time. In a couple years it will be easier. 400 mile range would help a lot now.

I am so spoiled and guilty for changing at home with $.10 power. Supercharger rates are almost comparable to gas aren't they?

When we first got our 2018 Model 3 the cost per mile was about 1/4 the cost of gas charging at a Tesla Supercharger now it is about 1/2 +/-. This is comparing it to a 35MPG ICE vehicle.

 

[TickTock]

Maybe the induction charger connection is the place to hack. I am thinking a 2000 watt fuel cell that allows the waste heat to heat the cabin/battery. Removable off course. That would increase the winter range a bit and prevent getting stranded as long as the fuel cell had fuel.

2000W could be useful in an emergency but means pulling over to wait for it to catch up. You are consuming over 10X that while moving at 60mph. We really need that high power connection to extend range without stopping.

 

[Tinker71]

2000W could be useful in an emergency but means pulling over to wait for it to catch up. You are consuming over 10X that while moving at 60mph. We really need that high power connection to extend range without stopping.

But over 5 hours it does add up. With very little extra weight. Run it while you drive.

 

[Speedr]

They'll have a lot of different options on how to use the power. It could be directly to the motors, but more probable, it'll feed back into the system gradually as to not over stress anything (or to put it more succinctly, not needing to be over engineer the connectors).

 

[mongo]

They'll have a lot of different options on how to use the power. It could be directly to the motors, but more probable, it'll feed back into the system gradually as to not over stress anything (or to put it more succinctly, not needing to be over engineer the connectors).

Anything that makes it more gradual wastes power. If the extender is half the capacity of the main pack (high end of estimate), direct connection to the HV bus means it would only source 1/3 of the total power. That puts the current draw at less than the current motor connections.

 

[Speedr]

Anything that makes it more gradual wastes power. If the extender is half the capacity of the main pack (high end of estimate), direct connection to the HV bus means it would only source 1/3 of the total power. That puts the current draw at less than the current motor connections.

Agreed, but we're talking high 95%+ efficiency though.

 

[mongo]

Agreed, but we're talking high 95%+ efficiency though.

95% round trip efficiency requires 97.5% one way efficiency.
If towing is 800 Wh/mile at 60 MPH, that's 48kW. If extender is 1/2 size (1/3 of total), it needs to be at least a 16kW converter. That's higher capacity than the charger (but only DC-DC, not AC-DC)

Superchargering at 250kW would require >80 kW conversion unless they charge independently which removes the charge curve improvement benefit.

I don't understand why the connections would be a concern.

 

[Speedr]

95% round trip efficiency requires 97.5% one way efficiency.
If towing is 800 Wh/mile at 60 MPH, that's 48kW. If extender is 1/2 size (1/3 of total), it needs to be at least a 16kW converter. That's higher capacity than the charger (but only DC-DC, not AC-DC)

Superchargering at 250kW would require >80 kW conversion unless they charge independently which removes the charge curve improvement benefit.

I don't understand why the connections would be a concern.

You're probably right, just pointing out that they have a lot of ways to utilize it. Tesla usually makes the smartest/cleverest decisions (engineering-wise, anyway).

 

[Electrified Marina]

I'm Curious as to how well the efficiency of the Cyber truck would be if we were to use one to tow one of our boats from Virginia Beach to DC.

 

[mongo]

I'm Curious as to how well the efficiency of the Cyber truck would be if we were to use one to tow one of our boats from Virginia Beach to DC.

What's a representative example of the boat type?

 

[Electrified Marina]

What's a representative example of the boat type?

Our boats are anywhere from 20-26 ft long. Our X-Shore Eelex is probably one of my favorites. Here
we are towing it out of the water with our Ford Lightning.

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