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Old 04-19-2022, 05:30 AM   #1
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EV motorhomes- getting more possible?

OK this may stir the pot a little. Doing some research I found a company (HYLN) that manufactures EV tractors. (18 wheelers) They dont make the chassis, they make and install the electric and drivetrain components. Hmmmmm, very interesting. Well they CLAIM these tractors, pulling a full load, have a 75 mile range. Naturally thats laughable for motorhome owners but hold on. They install holding tanks for natural gas and a small generator that charges those monster battery's a vehicle that size would need. They claim with generator on the vehicles range extends to around 1000 miles! (With a MH the generator would probably be propane fired) Im not sure I believe this but dang if thats true we may be on the cusp of something big regarding MH's. I wonder if the moderator will flag this post?? Im NOT pushing this stock- heck who knows if its a good play or not but technology seems to be moving towards large vehicles powered by electric.
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Old 04-19-2022, 06:32 AM   #2
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So, you are replacing a very efficient, low emissions truck engine with a less efficient, high emissions generator to charge the batteries to keep you going.

What am I missing here?

David
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Old 04-19-2022, 08:22 AM   #3
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The missing part is the up front cost and lost opportunity buying an expensive driveline that does not add any value to operation or ownership.

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Old 04-19-2022, 03:42 PM   #4
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So, you are replacing a very efficient, low emissions truck engine with a less efficient, high emissions generator to charge the batteries to keep you going.

What am I missing here?

David
Everything. A generator uses around a gallon of gas per hour. That varies on generator size and load but fuel use is still low. If you do the math thats way cheaper than powering a big diesel or gas motor. I surely can't run my Ford 460 on the highway for an hour on around a gallon. When you run a generator on nat gas or propane it generates much less complex hydrocarbons, co2, carbon monoxide, etc.
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Old 04-19-2022, 03:51 PM   #5
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The missing part is the up front cost and lost opportunity buying an expensive driveline that does not add any value to operation or ownership.

Mark B.
Albuquerque, NM
Now that post I agree with, but consider this. When autos first hit the road in the early 1900's they pretty much sucked. Hard to get gas, expensive, noisy, unreliable, and lots of other negatives. My point is technology stands still for nothing or no-one! This is potentially a huge step in the direction of EV motorhomes. Im not agreeing or disagreeing its good, bad, or whatever. Battery technology needs to get much better and less expensive but I believe were on the way. Who would have thought an 18 wheeler that runs on batteries would ever be possible a few years ago??
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Old 04-19-2022, 04:13 PM   #6
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Let's go all the way and see if a Wheaties powered bicycle can pull a fifth wheel.
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Old 04-19-2022, 09:09 PM   #7
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I think we are a long way from big electric RV's, if they were efficient, cost effective, had environmentally friendly batteries..that's a big one, long range, then it might have a chance. But the propane generator puts out less energy then its gas counterpart, so it would take even longer to charge that big battery pack.

Just my .02 not that it means much.
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Old 04-19-2022, 09:34 PM   #8
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Everything. A generator uses around a gallon of gas per hour. That varies on generator size and load but fuel use is still low. If you do the math thats way cheaper than powering a big diesel or gas motor. I surely can't run my Ford 460 on the highway for an hour on around a gallon.
Just because a generator can run for an hour on a gallon of fuel doesn't mean that it's producing anywhere near as much power as your Ford 460.

The generator in my motorhome uses about a gallon an hour and can provide a maximum of 7.5 kW of power.

The diesel engine in the coach provides 425 HP which is equal to ~320 kW of power. So the main diesel produces more than 5 times as much power as does the generator and uses 5-10x as much fuel.

In the long run, it all boils down to energy. As they say, there's no free lunch. If you want to be able to move a 35,000 pound vehicle either using electric motors or diesel fuel you need a motor large enough to do the job.

I don't think you'd find my generator adequate to charge batteries for a vehicle this large.
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Old 04-20-2022, 07:39 AM   #9
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Everything. A generator uses around a gallon of gas per hour. That varies on generator size and load but fuel use is still low. If you do the math thats way cheaper than powering a big diesel or gas motor.
A horse power is about 750 watts. To replace a 400 HP diesel engine you'll need almost 300,000 watts, not the generator we use for lights and power.
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Old 04-20-2022, 08:28 AM   #10
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The old Axiom is that you cannot create energy. A 30 HP Genset cannot replace a 350 HP engine. It can never be done!

I recently purchased one of those new electric leaf blowers. Yes, it's really powerful, for 30 to 40 minutes, and then it has to charge for a couple hours. And BTW, it's heavy. But it's all the new craze.
Once the battery is dead I get out my old gasoline powered blower to finish up.

I was in the Hardware store a week ago, and low and behold, a zero turn riding lawnmower powered by four of those batteries. My guess it will be good for 30 minutes or so.

But we are saving the planet by having a power plant, using fossil fuels, to provide electricity to charge a riding lawn mower.

Something doesn't add up.
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Old 04-20-2022, 08:34 AM   #11
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The old Axiom is that you cannot create energy. A 30 HP Genset cannot replace a 350 HP engine. It can never be done!

I recently purchased one of those new electric leaf blowers. Yes, it's really powerful, for 30 to 40 minutes, and then it has to charge for a couple hours. And BTW, it's heavy. But it's all the new craze.
Once the battery is dead I get out my old gasoline powered blower to finish up.

I was in the Hardware store a week ago, and low and behold, a zero turn riding lawnmower powered by four of those batteries. My guess it will be good for 30 minutes or so.

But we are saving the planet by having a power plant, using fossil fuels, to provide electricity to charge a riding lawn mower.

Something doesn't add up.
It makes people feel good because they feel like they are doing something. It is marketing by emotion rather than practicality.
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Old 04-20-2022, 08:34 AM   #12
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I have not done any research but have to wonder what it takes to provide heat in cold Wx and AC in hot Wx for an eMH?
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Old 04-20-2022, 08:47 AM   #13
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Having owned a large off-grid solar power system to provide power to 1/3 of our home for the past 10 years I can say from experience that while I applaud the industry for attempting to produce a 100% electric power plant large enough to power a tractor trailer I do not believe we are close to being able to see that capacity come to fruition until we see a major innovation in battery storage capacity, faster charging technology that does not result in excessive heat, and energy conversion methods that are much more efficient than currently exists.

The 75 miles that the tractor trailer was able to achieve on a fully charged battery bank was probably performed under ideal conditions that does not reflect what could be attained on elevated grades or during winter conditions when batteries tend to perform at lower than optimal levels thereby using even more amp hours to produce the same level of energy.

The other hidden issue is that even when you over come the technical challenges, which I believe they will, you then have to over come the supply issue of rare earth components utilized in this technology that becomes problematic based on the key word 'rare' and the 2nd element that now you have higher demand for what is already rare driving up the cost.
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Old 04-20-2022, 08:47 AM   #14
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EV motorhomes- getting more possible?

My volt car I drove for 3 years used the gas engine as a generator for the electric motor when the 40 mile battery was done. About a 500 mile combined range. Gas was only used for propulsion on level roads if the speed was just right ( no transmission)
1.5 liter ? engine did just fine providing all the power the electric motor required. The key is it retained a level of battery charge to “help” it on mountain passes or heavy acceleration. The battery also allowed the car to reclaim energy from slowing or braking.
Running on gas the engine speed was unrelated to throttle position. Mostly running at a constant speed it got great mileage and instant acceleration.
While it would require more than the 1.5 liter gas on a motorhome There are advantages to the system ..
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