I was wondering the same thing. Why on earth wouldn't the SAE just adopt the existing ChaDeMo standard that has existed for many years, and is already installed on thousands of vehicles worldwide? Okay, so now we have a standard. What do we need to do to get chargers installed in useable spaces nationwide? can we get SAE chargers in rest areas along interstates? What about shopping centers? National parks? How about at dealerships that sell EV's (and leave the dang things "ON" after hours)? Let's move this along now!
one approach for swapping that might work would be for cars to be equipped for two batteries - one that comes with the car and space for another one that is there for swapping networks. It could also then work for those who could leave one battery at home charging during the day and use two only when going on a long trip. These are heavy and you could save by carting around only half the battery capacity when you don't need more. This might work if each battery gives about 100 miles or so of driving capcaity. Are we there yet?
Most home service is 240V at 200A. The indication above is that you use 500V at up to 200A. This is about twice the pwer that is available at a typical home for everything. You would have to resort to a storage system to provide the current for your car at this rate for the shorter time period.
That's a great point, Rob. What if you purchase a vehicle that by its class and cost, has a more robust (i.e., more expensive battery) in play or even just a newer version of the standard battery used by all the participants in the swapping network. I wouldn't want to trade up my high-ticket battery for anything sub-standard.
In the Better Place, scenario, people don't actually own the batteries, they take part in a network where the batteries are swapped out and consumers simply pay for energy they use. I think the network is also built to accomodate a specific car model, although I'm not entirely sure on that point. Seems like there is still a lot to be worked out before it could become a truly supportable model.
A Better Place, a company formed by ex-SAP exec Shai Agassi, is one of the more prominent companies pursuing the battery swap model. They are pilot testing their changing station network in Israel and have plans to expand in Europe and China, but I don't believe the U.S. is on board quite yet.
At the Siemens conferece, I heard of another solution to help EVs travel farther than short trips -- battery swaps. You pull into a station and they take your battery and replace it with a charged one. Apparently this is more common outside the U.S.
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