Quote:
Originally Posted by redpoint5
Farms would have DCFC service if they had battery equipment. We're not talking about using battery tractors now, with existing infrastructure, we're talking about the future when such a thing might exist, and the practical infrastructure that might support it.
Yeah, but where did you derive the average power/fuel consumption? That info isn't readily available as far as I can tell, and I can only find peak HP specs from manufacturers. That's not a useful metric since equipment is rarely at peak power output.
I had browsed farming forums to see what farmers were reporting for diesel consumption per hour. It was low enough that the equipment could run for days without refueling.
I'd like to see more of the work shown if you don't mind.
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Oilpan4 threw out the fuel consumption value,so I just ran with that.
In the past,the SAE Papers have written such that,for instance,an automobile manufacturer will use gearing to limit top speed cruise to 80% of bhp-rated power,as you might do also in an aircraft.
If so,then we can take 80% of the bhp as the running power as an estimate (that's all mechanical engineering is good for,lacking published data,or a dyno)
We know the chemical energy potential of the fuel.It's published.
A range of thermal efficiencies are also in the literature,which imply BSFCs.
*With a 462-bhp engine,at 80% load,we'd have a available,constant,396.6-hp.
*With a thermal efficiency of 0.459,the diesel loses 54.1% of the fuel's energy before any useful work can be done.(it takes 1006.53 hp worth of diesel to produce 462-bhp at the shaft)
*An AC induction or permanent magnet motor may have a 98% mechanical efficiency,so it doesn't need as much 'fuel' as a BEV,compared to an ICE.
*On an hourly basis,I figured that an electric motor consuming 116.683 kWh can do the same work as the diesel engine.
*A Tesla Powerwall-II is rated at 200-kWh.
*14-Powerwalls in a trailer would cover 24-hours worth of continuous operation,as per oilpan4's requirement.
*14-Powerwalls weigh 3,701-pounds.(a 1980s full-size pickup truck)
*In a trailer with 2-flotation tires,we might expect an all-up trailer weight around 4,200-pounds.
*Run an umbilical cord between trailer and equipment.
*Or,special batteries could be incorporated inside the wheels,and provide the ballast as well.Import/export the power through slip-rings at the hubs.
*One trailer would do a day's work,while another charged in as little as 8-hours,with Volkswagen's equivalent capacity,with 480-VAC,3-phase utility power.
*The grid power could be renewable,so zero-carbon.The whole point of the exercise.
I can't think of anything else to add.Let me know if I've muddied the waters or not.
