I know Tesla is unlikely to go this route, but for semi trucks a hybrid solution could work too:
Here are my thoughts:
Drop a P90D drivetrain into a semi.
- Dual Motors to allow torque sleep.
- P to get into comparable HP regions
- Regear for optimal Efficiency @ 65mph
- Regear it for <90mph, to push torque higher, if it doesn't conflict with the efficiency target
- If the current battery pack can't be put on the Floor like in MS/MX it should be possible to fit it within the load strucutre by folding in in half (like the electric MB Semi prototype)
- Beef up cooling system for battery and Motors, to handle higher loads
Replace the existing engine with a 150KW Generator.
- Average power estimations range from ~100KW (according to a german study on a mixed urban-rural-Highway scenario, which I can't find right now) and 150KW for US Highways (according to a post in the Short-Term TSLA-Thread)
- As an example a Volvo Penta Generator like
this generates 150KW with a consumption of ~10 gal/h (and 100KW @ ~7 gal/h)
With this you'd get an average 6.5MPG @ 65mph (or 7.1MPG @50mph for european trucks )
Best case consumption of new ICE trucks in europe is ~7.8MPG (30l/100km) with average closer to 6.8MPG (35l/100km) for normal day-to-day Operation (mixed)
Additionally we get the following benefits:
- Regen capability (> 10% according to
this graphic on
this site)
- option to drive electric only (low noise, zero emissions)
- lower noise emissions due to fixed rpm
- removal of transmission (
900lbs) an driveshaft
- replacing the massive engine (
2400+lbs) with a lighter generator (~2100lbs for the penta including tank)
- resize exhaust treatment due to lower gas flow and lower variation in operationg conditions (constant rpm)
- Instead of "up to 45 %" engine efficiency for best case, the generator is running at a constant load (36% for 150KWh/10gal)
- The volume saved by smaller and removed parts should allow more freedom for aerodynamic optimisations
- Base drive load will be provided by the generator. The battery pack will see very low loads and cycles.
Most of these should push Efficiency even higher without causing any additional cost.
Once you have this system running you can start to optimize even further with different battery and generator sizes or additional motors
I know this looks a lot like the "
Nikola one"-truck but for me this looks to be the fastest way to get into the semi business without much higher costs.
That's it for my fist post