Recent content by DGDanforth

I find that my new Model 3 is loosing about 1 mile of charge per day. I do very little driving so most of the time the car is just sitting in its underground parking stall. It's disconcerting to watch the charge drop day after day. Has anyone else measured their Model 3 charge leakage?

"Monster" is not a scientific term. Please don't use "click bait" on this forum.

Well, I vote for the smaller car, the station wagon. When I was in high school station wagons had wood paneling and were called "woodies".

What the heck is the difference between a "sports wagon" and a "SUV"?

The compact is still too big. Need to reduce it's ass.

That would depend on the retention time of the fast charging system. IF the retention time (say 8 hours) is longer than the time to charge the battery THEN that would work. Good thought.

... and do you just give away the old battery?

Thank you. I just read up on Wikipedia about "boost converters". I should have said constant power (20kW).

Sorry but I don't know anything about "boost converters". Do you mean DC to AC conversion? I thought modern converters could handle a wide range of voltages. I assumed a *constant* DC current to yield a 300 mile range from 100kWh supercapacitor.

Based on E = 1/2 CV^2 I find the capacitance necessary for an energy of 100kWh at 400V to be 4500 F. When the voltage drops to 350V the remaining energy is 76.56 kWh. A Tesla model S gets about 3 miles per kWh and its range is about 300 miles. Driving at 60 miles per hour takes 5 hours to...

They make a profit by the cost difference between supercapacitor and battery.

They still make a profit when the cost of the supercapacitor is far less than the cost of the battery. The battery is repackaged as a powerpack and resold.

My worry is the retention time which is not mentioned in any of the reports I have read. High charge and discharge rates mean nothing if the energy leaks away in a few seconds or a day.

Not the same case. Phone technology and battery technology are different. If a massively cheaper supercapacitor does hit the market then I would expect phone companies will adopt it. But a phone is far cheaper than a car so replacing the battery rather than buying a new phone does not make...

I agree with Elon. It seems that Rolls Royce, however, has stolen the show and opted to be the one to evaluate the technology.