View Single Post
Old 02-28-2017, 09:27 AM   #7
cafesport
Guru
 
cafesport's Avatar
 
City: Miami
Join Date: Jul 2013
Posts: 800
Seems we had this question come up a bit ago maybe someone can combine the threads.

Electric motors are fine its really mostly a battery problem at this point. Looking at the numbers and converting everything to kilowatts a lifeline AGM 8d contains 255 amps of current at 12 volts. That's 3060 watts, but in reality you can only use 1/2 of the capacity before needing a recharge. So 1530 watts divided 70.3 kg equals 21.7 watts/kg for an energy density comparison. The lithium "x" torqeedo pack according to the spec sheet is 2685 watts per pack, but at least you can use all its capacity. So 2685watts/24.3 kg is 110 watts/kg. Better you say until you compare it to diesel. Diesel fuel is a whopping 13,400 watts/kg. You'll need over 121 kg of those torqeedo batteries to give you the energy packed into 1 kg of diesel fuel. Then you still need to figure out how to charge them.
__________________
Via iOS.
cafesport is offline   Reply With Quote