panamamike
Posts: 63
Joined: Sat Jan 25, 2020 10:21 am

Re: Using range extender only for electric charge

Wed Feb 12, 2020 1:00 pm

alohart wrote:
Wed Feb 12, 2020 12:11 pm
panamamike wrote:
Wed Feb 12, 2020 10:36 am
I wonder how they calculated the generator efficiency to be 94% giving 23.3kW.
I interpreted 94% to be the efficiency of the electric side only (i.e., the generator, rectifier, battery cells, etc.).
I'm interested in the optimal gas to electricity generation efficiency. Would it be possible to get better than 40 mpg from the REX.

alohart
Posts: 1909
Joined: Sat Nov 01, 2014 7:36 pm
Location: Honolulu, HI

Re: Using range extender only for electric charge

Wed Feb 12, 2020 3:20 pm

panamamike wrote:
Wed Feb 12, 2020 1:00 pm
I'm interested in the optimal gas to electricity generation efficiency. Would it be possible to get better than 40 mpg from the REX.
Based on what I've read (we have a BEV), under ideal driving conditions, 40 mpg would be near the top of the efficiency range reported. 30 - 40 mpg seems to be typical. Definitely less efficient than a Prius or other efficient gasoline-electric parallel hybrids. The series hybrid (e.g., i3 REx) process of converting chemical energy into electrical energy and then into mechanical energy is less efficient that the parallel hybrid (e.g., Prius) process of converting chemical energy directly into mechanical energy.
Aloha,
Art

2014 BMW i3 Arravani Grey, Giga World, Tech + Driving Assist, Parking Assist, DC Fast Charging, JuiceBox EVSE

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