This is the long awaited upgrade that jumps the operating range to 400 miles. That was really the bare minimum that was needed. After that milestone is reached, what follows is reduction in battery size. Obviously we will reach all this soon enough even with this type of technology.
Of course followers of my blog know that we have now bench topped a motor able to put out around fifty brake horsepower so far by drawing electrostatic potential from the ambient dark matter. It currently is able to load a 300 pound household transformer in minutes which is no mean trick. That means that battery regimes are already obsolete before they even get seriously started.
We are not ready to take orders yet but will certainly accept capital support and inquiries for an order log. We can ship as early as this spring for specific engine replacements. My bottom line is that we know now how to power up a vehicle and how to power up a house as well. What we have not done yet is to optimize the deliverable as yet. That takes time and plenty of road testing. Up until then we can deliver test vehicles to interested parties.
December 26, 2014
Battery technology has continued a steady improvement in recent years, as has our experience in optimizing total vehicle efficiency through Model S development. We have long been excited to apply our learning back to our first vehicle, and are thrilled to do just that with the prototype Roadster 3.0 package. It consists of three main improvement areas.
The original Roadster battery was the very first lithium ion battery put into production in any vehicle. It was state of the art in 2008, but cell technology has improved substantially since then. We have identified a new cell that has 31% more energy than the original Roadster cell. Using this new cell we have created a battery pack that delivers roughly 70kWh in the same package as the original battery.
The original Roadster had a drag coefficient (Cd) of 0.36. Using modern computational methods we expect to make a 15% improvement, dropping the total Cd down to 0.31 with a retrofit aero kit.
3. Rolling Resistance
The original Roadster tires have a rolling resistance coefficient (Crr) of 11.0 kg/ton. New tires that we will use on the Roadster 3.0 have a Crr of roughly 8.9 kg/ton, about a 20% improvement. We are also making improvements in the wheel bearings and residual brake drag that further reduce overall rolling resistance of the car.
Combining all of these improvements we can achieve a predicted 40-50% improvement on range between the original Roadster and Roadster 3.0. There is a set of speeds and driving conditions where we can confidently drive the Roadster 3.0 over 400 miles. We will be demonstrating this in the real world during a non-stop drive from San Francisco to Los Angeles in the early weeks of 2015.
Appointments for upgrading Roadsters will be taken this spring once the new battery pack finishes safety validation. We are confident that this will not be the last update the Roadster will receive in the many years to come.