Winnebago Electric Motorhome on a F-53 chassis

time2roll wrote:
fair enough. The numbers are probably right. Good to have a baseline as it will just improve from here. Battery cost needs to keep declining along with energy density. We are not at the end of the curve yet IMO.

Don't get me wrong I think electric RV's will happen I am just skeptical it will be very soon. I would be surprised to see any widespread production ones in the next 10 years. I would be glad to be proven wrong. Long distance highway travel for a large vehicle is the most extreme application of an electric vehicle due to battery cost and weight. The Tesla semi is boggling in the numbers, megawatt hour batteries, megawatt chargers, 4 motors at 1000hp / 2000lb-ft of torque. I am very skeptical they can pull it off at the costs they are claiming without losing money on it, again hope to be proven wrong.

I used to think how great it would be if an RV was setup like a diesel electric train, maybe multiple generators for redundancy etc. But once you do the math you realize how that just not feasible. Trains and some boats do it for specific reasons while accepting the downsides. Those downsides are just too great for weight and size constrained road vehicles.

Thinking about an RV with Tesla semi size battery though that gives me goosebumps. Run the a/c offgrid for almost a month! No generator noise. Slow charge off solar, or any wall plug you can find. Won't get you far but maybe enough to get to a real charger. Truly all electric setup, will be fun.

Reisender wrote:
Typical line up at Costco gas. Every single freaking day. The average supercharger stop is 24 minutes. Then again, the vast majority of the time you charge at home...while you sleep.

Costco is a weird place.

I rarely wait for one person to get out of the way...certainly not 4-5 cars to fill up before I can get to the pump.

Of course, if EV's ever were popular, could you imagine waiting for 4-5 cars that each take 1/2 hour.

jharrell wrote:

time2roll wrote:
OK the 9kW to 12kW generator will not push the MH at full speed but maybe get you to 200/300 mile range (diesel+battery) before stopping. For many that would be enough that they were stopped for the day. Plug in a few days or more while you slow charge before you move again.

Not perfect but might work for a few until the system is improved.

So looking at the specs, which where difficult to find the Winnebago has a 127kwh battery and a 60mph max speed. It will not go 125 miles at 60mph, the max range figure are at slower city speeds 30-40 mph where air resistance is much lower. But lets give them the benefit of the doubt and say it gets 125 miles at 60 mph on 127kwh. Thats about 1 kwh per mile or
about 63kw of constant draw from the battery. It would take 3.3 hours to go 200 miles consuming 200kwh of power meaning the generator has to makeup 73kwh.

Thats a 22kw generator to go an extra 75 miles and arrive with a dead battery. It would need a 34kw generator to go 300 miles. A 12kw generator would give it maybe an extra 40 miles and I am being very generous in the math, probably much less.

I was just about to post something similar.

Until battery technology gets up to maybe 25% the density of gas/diesel...it's a no go for RV's where a common usage pattern is a few hundred miles to a remote area (ie: not charging stations) followed a day or two later by another few hundred miles...particularly if like other EV's it comes in 1/3 higher priced than an ICE.

Ivylog wrote:

jharrell wrote:

time2roll wrote:
OK the 9kW to 12kW generator will not push the MH at full speed but maybe get you to 200/300 mile range (diesel+battery) before stopping. For many that would be enough that they were stopped for the day. Plug in a few days or more while you slow charge before you move again.

Not perfect but might work for a few until the system is improved.

So looking at the specs, which where difficult to find the Winnebago has a 127kwh battery and a 60mph max speed. It will not go 125 miles at 60mph, the max range figure are at slower city speeds 30-40 mph where air resistance is much lower. But lets give them the benefit of the doubt and say it gets 125 miles at 60 mph on 127kwh. Thats about 1 kwh per mile or
about 63kw of constant draw from the battery. It would take 3.3 hours to go 200 miles consuming 200kwh of power meaning the generator has to makeup 73kwh.

Thats a 22kw generator to go an extra 75 miles and arrive with a dead battery. It would need a 34kw generator to go 300 miles. A 12kw generator would give it maybe an extra 40 miles and I am being very generous in the math, probably much less.

You are a real spoiler with all your facts. :B

fair enough. The numbers are probably right. Good to have a baseline as it will just improve from here. Battery cost needs to keep declining along with energy density. We are not at the end of the curve yet IMO.

120 mile range is approx 2 1/2 hour travel time max, and that’s right up until it’s dead! I average 10 hours a day driving and have done 12-14 hours on occasion. I could barely make it to mid Wisconsin on a charge!

I like the idea, but it needs more time to be a viable option.

jharrell wrote:

time2roll wrote:
OK the 9kW to 12kW generator will not push the MH at full speed but maybe get you to 200/300 mile range (diesel+battery) before stopping. For many that would be enough that they were stopped for the day. Plug in a few days or more while you slow charge before you move again.

Not perfect but might work for a few until the system is improved.

So looking at the specs, which where difficult to find the Winnebago has a 127kwh battery and a 60mph max speed. It will not go 125 miles at 60mph, the max range figure are at slower city speeds 30-40 mph where air resistance is much lower. But lets give them the benefit of the doubt and say it gets 125 miles at 60 mph on 127kwh. Thats about 1 kwh per mile or
about 63kw of constant draw from the battery. It would take 3.3 hours to go 200 miles consuming 200kwh of power meaning the generator has to makeup 73kwh.

Thats a 22kw generator to go an extra 75 miles and arrive with a dead battery. It would need a 34kw generator to go 300 miles. A 12kw generator would give it maybe an extra 40 miles and I am being very generous in the math, probably much less.

You are a real spoiler with all your facts. :B

Typical line up at Costco gas. Every single freaking day. The average supercharger stop is 24 minutes. Then again, the vast majority of the time you charge at home...while you sleep.

Chainwright wrote:


Nope. Corporate America doesn't care how long you're at the gas station. Like I said 7-11 and co. make their money from YOU coming into the store and buying. An EV recharging station takes up much less space then a gas Pump (I said 10 -15 to be nice, but they could easily put 20-25 at a gas station). People that buy EV's are not dumb, they know there will be times they may have to wait 5-10+ to recharge. But progress is being made as we speak to where you can get a good and nice charge in 10 min. Had I had a problem with RISKING to be stuck waiting 10-15 min for my car to charge I would have never bought the d... thing in the 1st place. Give these folks some credit, just a little, credit. The rest of the world is making strides in Technology and we're still in the stone ages in comparison and you're saying the oil lobby has nothing to do with it. Wow.....

Best reply yet on my thread, Thanks Chainwright.

What many folks on here don't understand is the younger generation is wanting and ready for the electric revolution, they will understand the time it takes to charge, what I see is places like 7-11 and others with charging stations for the EV's and sit down areas in the store with Starbucks style coffees and such, charging stations will be at some work places, at bars, at hotels, on the highways to popular destination's, at home, and some RV parks.

The younger generation will buy the smaller EV motorhome vs a big ICE motorhome when they come on line and at a lower cost with more distance, this will cause a shakeup in the RV world and places like Winnebago will start making more small EV motorhomes and start dropping the big ICE motorhomes.

2025 has been predicted by many in the EV field as the EV revolution, this will be the tipping point of EV's when you go to buy a new car or truck and the dealer will probably only have EV's for sale and commercial trucks and RV's will soon follow.

Electric cars will come of age in 2018 | The Economist
https://youtu.be/zGFb6CcG0DA

wildtoad wrote:

Chainwright wrote:
Nah, the hold up in "Infrastructure" is the big oil Lobby. 7-11, circle K's, Corner store, they all partner up with Shell, Exxon, Chevron, Valero and so on, but as any of those business owners and they will tell you that DO NOT make huge profits off of gas but off of the snacks, drinks, meals and other items they offer in their stores. IT will come to pass, in the near future, when a BIG player like let's say Wal-mart will understand what's happening, and will create a Gas stations that has 10 to 15 EV charging stations, EV owners will plug up their EV's, knowing the recharge will take 5,10, 15-30 min and go inside to buy snacks or have breakfast or lunch. Naturally being a BIG player Wal-Mart (or whoever the lucky Co is) will offer petroleum gas pumps too. But as long as Big oil has congress in it's pocket, it won't happen. Tides have to turn, it's happening slowly, but the reason for that is Europe.

Nonsense. It is valid that IF you need or want to go to Walmart then it will make sense to plug your car in while there. It makes sense if you have a EV RV then recharging overnight will work too, just as soon as the power stations are installed. But if you are just traveling down the road and need to replenish the batteries of your vehicle, then stopping for and waiting at a filling station for more than 5-10 minutes will be painful. If ALL the current filling stations along the interstate system were magically converted to charging stations, the arrival rate at the station will exceed the departure rate and just like a sewer it will back up. Gas stations already have an issue with cars taking too long to full up, enter the store for snacks, buy lottery tickets. Extending the time by 30 minutes just for the charge would be problematic. It has nothing to do with Big Oil.

There may be opportunities for creating large recharging locations that offer something to do while you wait, but it will take major investment. It may happen.

Nope. Corporate America doesn't care how long you're at the gas station. Like I said 7-11 and co. make their money from YOU coming into the store and buying. An EV recharging station takes up much less space then a gas Pump (I said 10 -15 to be nice, but they could easily put 20-25 at a gas station). People that buy EV's are not dumb, they know there will be times they may have to wait 5-10+ to recharge. But progress is being made as we speak to where you can get a good and nice charge in 10 min. Had I had a problem with RISKING to be stuck waiting 10-15 min for my car to charge I would have never bought the d... thing in the 1st place. Give these folks some credit, just a little, credit. The rest of the world is making strides in Technology and we're still in the stone ages in comparison and you're saying the oil lobby has nothing to do with it. Wow.....

time2roll wrote:
OK the 9kW to 12kW generator will not push the MH at full speed but maybe get you to 200/300 mile range (diesel+battery) before stopping. For many that would be enough that they were stopped for the day. Plug in a few days or more while you slow charge before you move again.

Not perfect but might work for a few until the system is improved.

So looking at the specs, which where difficult to find the Winnebago has a 127kwh battery and a 60mph max speed. It will not go 125 miles at 60mph, the max range figure are at slower city speeds 30-40 mph where air resistance is much lower. But lets give them the benefit of the doubt and say it gets 125 miles at 60 mph on 127kwh. Thats about 1 kwh per mile or
about 63kw of constant draw from the battery. It would take 3.3 hours to go 200 miles consuming 200kwh of power meaning the generator has to makeup 73kwh.

Thats a 22kw generator to go an extra 75 miles and arrive with a dead battery. It would need a 34kw generator to go 300 miles. A 12kw generator would give it maybe an extra 40 miles and I am being very generous in the math, probably much less.