Originally posted by AlbertaFarmer5
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Where will the diesel fuel come from if we do replace gasoline engines with EV's?
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Originally posted by biglentil View PostLets look at this a bit farther. A horsepower is defined as 745 watts. A typical 80ft drill and cart will do best with a 600hp tractor typically operating around 80% engine load or 480hp conditions depending. 480hp X 745 = thats 357kw/hr. Now lets use your highside estimate of 90% efficient electrical drivetrain. Typical rig probably operates at least 12hrs a day. So 12x357/0.9 = 4760KWH battery is required. Lets assume they could have a battery that large fit somewhere. The new Ford Lightning pickup has a 131KWH battery for example and when towing a medium sized trailer has a range of around 100miles. The new Electric Bobcat is claimed to last upto 4hr but am hearing 2hrs is more real world.
Ok so now the problem charging the massive 4760kwh battery. The best charging efficiency for a Tesla is 89% due to heat from the inverter and wire loss. So 5348000 watts are required from the grid source. Lets say the farm has a 400amp service even though I think a 200amp service is probably more typical. 400ampsx240volts= 96000 watts/hr. So to charge that battery (5348000/96000) = 56hrs of charge time and during that time not even a single lightbulb in the farm yard could be turned on.
Battery operated tractors are a pipe dream imo.
https://youtu.be/kHnMPIOqzTE
https://youtu.be/qcYR2XaD0UA
https://youtu.be/NDFEJRqGssoLast edited by ALBERTAFARMER4; Oct 18, 2022, 06:28.
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Originally posted by ALBERTAFARMER4 View Post1000L of diesel is 10,000kWh or 10MWh.
1000L of diesel cost is $1500 roughly
10,000 kWh cost is $2000.
Electricity is 33% MORE expensive than diesel.
Electric powertrain would be 80-90% efficient vs diesel at 35% efficiency. Electricity is already more expensive than gas/diesel at todays prices when purchasing an equivalent amount.
The biggest limitation to farm use would be electrical capacity. I have a 200 amp service, even if this was tripled there are times when it wouldn’t be enough and I run a small operation. If you were farming 10000 acres and up I can’t imagine what you would require for an electrical service..
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Originally posted by ALBERTAFARMER4 View PostYou’re thinking about this in the wrong way…
https://youtu.be/kHnMPIOqzTE
https://youtu.be/qcYR2XaD0UA
https://youtu.be/NDFEJRqGsso
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Originally posted by biglentil View PostNope autonomous or not, big or small, doesnt change the overall amount of work required to put a crop in. My math is there prove it wrong. Cute fluffy videos though.
Whether the farming operation is done by 1 600 horsepower machine or 600 1 horsepower machines, the total energy required to charge them all won't change significantly.
But the only real savings would be not having to drag as much dead weight around in total
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Guest
There’s those inconvenient Damn laws of physics again
“An inconvenient truth†shall we say?
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Originally posted by shtferbrains View PostSo the smaller implement size is the most energy efficient?
60 one ft units are more energy efficient than one 60 ft?
Using a heavily ballasted tractor to drag and implement by a drawbar it's definitely the least efficient setup. Having a completely mounted implement would eliminate the need for all of that ballast, and would have traction efficiencies.
Probably take the autonomous concept further and have refills on the go at every headland and eliminate carrying all of that extra weight.
Very rough ballpark guess probably be 30 to 40% more efficient. Still not possible to charge money 400 amp service given the numbers provided above.Last edited by AlbertaFarmer5; Oct 18, 2022, 21:37.
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