Harvester Gas Tank location moved to under rear seats & batteries moved to front (tow rating benefit) ⛽️

[brp]

This all had me thinking more, and I thought I’d test my stale math skills and developed this formula. It tells you how many hours you can go until the battery is depleted.

B=Battery size, fully charged
C=Consumption of electric motor in kw
O=Output of generator in KW
T=Time you can drive before battery is empty.

T = B / (O - C)

Using the Aging Wheels video as a reference for towing at 75mph with a dual axle trailer:

Empty trailer: 51kw
Trailer with a car on it: 68kw
Trailer with a truck on it: 79kw
Flat sail in the wind: 104kw

Using the trailer with a truck on it as reasonable towing use case, the instantaneous consumption is 79kw at 75 mph.

Here are a few scenarios with different battery sizes and generator outputs. The result is the hours you could drive at 75mph while towing an F150 on a dual axle trailer.

80kwh 60kw 4.2 hours
70kwh 60kw 3.6 hours
60kwh 60kw. 3.15 hours

80kwh 70kw. 8.8 hours
70kwh 70kw. 7.7 hours
60kwh 70kw. 6.6 hours

Thanks ai for helping me on some of this.
I’d like data for 70mph, as I think the generator could match the instantaneous output of many uses cases, which would be great. I also think 75mph towing is on the faster side. If slowing from 75 to 70 totally changes the paradigm, and I think it might, that is a very practical solution to this.

This all assumes the gas tank is big enough to support the generator output for the time describe.

 

[TexasBob]

This all had me thinking more, and I thought I’d test my stale math skills and developed this formula. It tells you how many hours you can go until the battery is depleted.

B=Battery size, fully charged
C=Consumption of electric motor in kw
O=Output of generator in KW
T=Time you can drive before battery is empty.

T = B / (O - C)

Using the Aging Wheels video as a reference for towing at 75mph with a dual axle trailer:

Empty trailer: 51kw
Trailer with a car on it: 68kw
Trailer with a truck on it: 79kw
Flat sail in the wind: 104kw

Using the trailer with a truck on it as reasonable towing use case, the instantaneous consumption is 79kw at 75 mph.

Here are a few scenarios with different battery sizes and generator outputs. The result is the hours you could drive at 75mph while towing an F150 on a dual axle trailer.

80kwh 60kw 4.2 hours
70kwh 60kw 3.6 hours
60kwh 60kw. 3.15 hours

80kwh 70kw. 8.8 hours
70kwh 70kw. 7.7 hours
60kwh 70kw. 6.6 hours

Thanks ai for helping me on some of this.
I’d like data for 70mph, as I think the generator could match the instantaneous output of many uses cases, which would be great. I also think 75mph towing is on the faster side. If slowing from 75 to 70 totally changes the paradigm, and I think it might, that is a very practical solution to this.

This all assumes the gas tank is big enough to support the generator output for the time describe.

You are hitting the nail on the head with your numbers. Start with a full battery and there is a draw-down which - even with heavy loads - would give you several hours of driving. But you cannot count on that.

So how is Scout going to set the official towing load? What number do you manage to? What if it is 30 degrees and you are in the mountains? Is 0.75 mi/kwh appropriate? In nice weather with a 6,000 lb load the silverado got 1.0 - 1.1

If you are Scout, you probably must set the tow rating to whatever the generator can handle by itself since your customer, leaving his campground having not charged for 5 days, must pull that trailer home. So then you have to completely discount the extra towing value of a full battery. This is why you end up with pretty modest ratings.

 

[brp]

You are hitting the nail on the head with your numbers. Start with a full battery and there is a draw-down which - even with heavy loads - would give you several hours of driving. But you cannot count on that.

So how is Scout going to set the official towing load? What number do you manage to? What if it is 30 degrees and you are in the mountains? Is 0.75 mi/kwh appropriate? In nice weather with a 6,000 lb load the silverado got 1.0 - 1.1

If you are Scout, you probably must set the tow rating to whatever the generator can handle by itself since your customer, leaving his campground having not charged for 5 days, must pull that trailer home. So then you have to completely discount the extra towing value of a full battery. This is why you end up with pretty modest ratings.

Texas Bob, I think Scout will still set the ratings based on the methodology of conventional trucks. With little to no regard for EV considerations.

I don’t know how the EV truck makers set ratings.

This demonstrates the importance of software. You’re hypothetical guy on the hiking trip needs to be able to leave his generator running, or have it start on a timer, so the battery is conditioned/full/to his liking
when he arrives back at the vehicle

In the real world, the Aging Wheels video makes clear the importance of aerodynamics. When I have a Scout, I won’t exceed the ratings and I’ll prioritize aero loads.