Submitted by bob on Tue, 2016-04-12 22:08
I am in line for the Model 3 and I currently drive a Chevy Spark EV, which has a 19Kw battery and I get about 80 miles a charge. That actually works pretty good for me since I drive under that daily. it seems the larger the battery, the heavier the battery and it takes a whole lot more battery to go fewer miles as the weight piles up. It would be very innovative of Tesla to offer spots for (3) 30Kw batteries per car. Each battery weighs about 450 pounds so you can see how that can add up. By my guess if you had just one 30Kw battery the car would go about 140 miles. (2) 30KW batteries would get you about 215 miles and (3) 30KW batteries about 280 miles. The numbers may be a bit off but the point is the lighter the car the more efficient is runs. Lets say for the most part you only need the (1) 30KW battery. You buy the second one which sits on your garage floor and keeps charged. That one day you want to drive further you push a button in the morning and load up your second battery and YAY you now have a 60Kw battery car. Maybe a couple years go by and you pick up a job that requires a longer drive, go buy that third battery and plug it in. This also allows someone to buy into the car cheaper and buy more battery as they can afford it.