Re: Electric Farm Tractors



Morris Dovey wrote:

Where did you get that? They need sufficient power and traction to
move themselves and their largest attachment in sometimes wet fields,
they need power to operate hydraulic systems, and they need power to
drive equipment (balers, elevators, grain augers, planters,
snow-blowers, sprayers,...) coupled to the PTO.

Yep. Big power:

John Deere 9020 Series Tractors offer a wide range in
power choices with up to 500-engine horsepower.
Choose 4-wheel-drive or track configurations. And an
available 18-speed Automatic PowerShift Transmission
helps put this incredible power to the ground. Add
popular options like GreenStar™ AutoTrac hands-free
assisted steering for unmatched productivity.
9120 (280 hp)
9220 (325 hp)
9320 (375 hp)
9420 (425 hp)
9520 (450 hp)
9620 (500 hp)
9320T (375 hp)
9420T (425 hp)
9520T (450 hp)
9620T (500 hp)
http://www.deere.com/en_US/ProductCatalog/FR/series/9020.html



Typically not more than 5 miles - but that number has been steadily
increasing as the amount of land required to sustain a farm operation
has risen. I don't know what a typical commute distance is, but will
point out that there are significant differences between the machines
you're comparing.

Uh, check my math?

640 acres = 1 square mile.
1 mile = 5280 feet.
5280 feet / 30 foot wide plow = 176 rows = 176 miles.
5280 feet / 40 foot wide plow = 132 rows = 132 miles.

Thanks to his John Deere 9520T Tractor equipped with
the GreenStar™ AutoTrac Assisted Steering System, a
John Deere 61-foot air seeder, and running 24-hours a
day, he was able to get approximately 3,800 acres
seeded in a five-day period.
http://www.deere.com/en_US/ag/equipment/new/tractor/customer-testimonial-index-9020-tractor.html

640 acres = 1 square mile.
5280 feet / 60 foot wide air seeder = 88 rows = 88 miles per 640 acres.

3800 acres = almost 6 square miles.

3800 acres / 640 acres * 88 miles = 522.5 miles.

522.5 miles / (24 hrs * 5 days) = 4.35 mph.


| They don't get used
| at night very much so the charge cycle could be almost all night,
| so no quick charging to reduce battery life.

Only at planting time when it's not unusual for tractors to be run all
day and all night.

Come harvest time, it's the combines that are run 'round the clock.

At both of these times there is extreme pressure (on both people and
machinery) to get a lot of work done in a small time window.

"running 24-hours a day, he was able to get approximately 3,800 acres seeded in a five-day period"


.

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