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Asked in addition way: What MPGe can we apprehend from Tesla’s new electric semi truck?

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In a antecedent Inside EVs commodity there developed an absorbing altercation in the comments area about to Tesla’s semi barter array size. In that altercation one commenter (@PMPU) posted:

“Our academic BEV semi will accept an activity ability 2.6 times that of a agent semi. (An EV car is about 3.5 x as activity able as an boilerplate gasmobile, but agent engines are about 30-35% added able than gas engines.)”

In an accomplishment to added clarify this “napkin math”, we dug a little added and begin a actual absorbing blueprint fabricated by Cummins about to the Cool Barter program. This cool barter affairs was advised to see what MPG one could get out of a Agent semi barter if one pulled out all the stops: installed the best able avant-garde tech agent engine, bigger the aerodynamics, bargain the rolling attrition etc.

At accepted MPG of about 6.5 MPG this cool barter affairs approved about 10 MPG (1.5 times bigger mileage).

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Cummins appear a breakdown of all the losses in a semi truck: engine, aerodynamic, rolling, drive train, aux endless and braking and put them in a blueprint apparent in bulk 1.

Cummins Accident Breakdown for Agent Semi Truck

The aboriginal affair that all-overs out on this blueprint is the agent losses which Cummins puts at 58%. What Cummins has aback told us with this cardinal is the agent agent aeon ability is 42% as apparent in bulk 2.

Loss Breakdown for Agent Semi Truck

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In added words, at 100 BTU of ascribe activity to the agent engine, 58 BTU’s is alone in decay heat.

The added losses are listed for both an artery active aeon and an burghal cycle. Note from bulk 2 that braking losses are adequately basal for the artery active aeon but are a big accident in an burghal aeon area we accept lots of starting and stopping.

Aerodynamic losses accept the about-face effect. Aero losses are basal in an burghal aeon but a big contributor in an artery aeon area we run college speeds.

So Cummins blueprint seems to accomplish sense.

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Now that we accept the losses burst bottomward we can accomplish some assumptions for what we could get with an electric semi truck. This electric semi barter acutely includes a abundant added able motor than the agent and like electric cars it incorporates adorning braking and all-encompassing aero modifications.

The accident breakdown for the electric barter is apparent in bulk 3.

Estimated losses for Electric Semi Truck

The bigger advance occurs in the electric motor and inverter. We aloof bargain losses from 58 BTU (out of 100) to 14 Btu’s. The aing bigger improvements appear in the anatomy of bigger aerodynamics and adorning braking. Regen saves us 13 Btu’s in the burghal aeon and bigger aerodynamics saves us 8 BTU’s in the artery cycle. Improvements in aerodynamics losses were arbitrarily put at 50%. Adorning braking affected we captured 80% of the accessible energy. Rolling resistance, drive alternation losses afresh arbitrarily bargain in half.

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Adding up our electric semi barter improvements we accept bargain the bulk of activity appropriate from 100 for the agent to 34 in the electric semi truck: a agency of 2.94 bigger than the diesel.

The after-effects of this mini analysis-call it “napkin Math 1.5”- are apparent in bulk 4.

Electric Semi Barter requires about 1200 kwh for 600 mile range

Napkin Math adaptation 1.5 estimates the arrangement of electric to agent MPG at 2.94 compared to “Napkin math” adaptation 1.0 arrangement of 2.6.

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Applying the arrangement of 2.94 to the diesel’s MPG of 6.5 we accept an electric semi barter with a 19.1 MPGe = .503 afar per kwh.

As a advertence BYD’s electric bus gets about 15.7 MPGe at 14 MPH with A/C on and abounding commuter load. At 42 MPH the BYD bus accomplished 32 MPGe so we feel almost assured that we are “in the brawl park” on what Tesla can accomplish with an electric semi.

So the array is how big?

For a 600 mile ambit at .503 miles/kwh we charge 1193 kwh battery: almost 12, P100D array packs: at $100/kwh that’s $120,000 battery.

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It should be absorbing to see what abstruse advice Tesla reveals about the new semi barter back it is clearly apparent this September.

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