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09-26-2020, 05:16 PM #41
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Your rather narrow minded aren't you. Not Fox news, San Mateo mercury. Just keep drinking the Kool aid. What I know for a fact, is my Tesla roadster takes a day and a half to go from Palo alto to Las Vegas with charging times and an indirect route to line up with charging stations. And thats in highway mode, not sport mode.
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09-26-2020, 05:27 PM #42
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Originally Posted by [email protected]
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09-26-2020, 05:52 PM #43
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Not 1000 towing miles in an hour at 350KW. It's 2KW/mile that they are looking at on the semi, I see little reason to think that we'd get a ton better towing a big 5er; we don't with diesel engines, I get about 8-9, a semi gets about 7-8. A little better, but not 100% better. I think 1.5KW/M is a reasonable benchmark for what it would take to tow a big 5er. So, at 300KW charger, you'll get about 200 miles of charge in 1 hr. On a 1000KW charger, now we're talking, you could get 700+ miles in an hour, still not as fast as a diesel fill up, but, not too bad.
Also they are "estimating" a 53 minute full charge at a mega charger and a 30 minute charge to 80% from empty on the semi
What I know for a fact, is my Tesla roadster takes a day and a half to go from Palo alto to Las Vegas with charging times and an indirect route to line up with charging stations.Last edited by Overtaxed; 09-26-2020 at 05:55 PM.
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09-26-2020, 06:03 PM #44
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Originally Posted by [email protected]
The batteries and the charging infrastructure have changed a lot since your Tesla was built, and, Tesla's batteries are going to change a WHOLE LOT more over the next couple of years (referring to Tesla's Battery Day). Additionally, the Charging Stations are now offering charging rates of up to 350 Kwh.
Based on your description of the trip from Palo Alto to Vegas, a day and a half seems pretty long, however, I doubt that I would make a 550 mile trip without having an overnight stop. Realistically, I would much rather split the drive into a 7 hour chunk and a 4 hour chunk instead of trying to drive that far in a single day. I would want to be rested enough to enjoy my time in Vegas versus being tired from the drive and forcing my self to enjoy being in Vegas while I am Dog Tired from the drive. So, even if I had a Gas car that could make the trip in one shot, I wouldn't (when I was young and stupid, yes, but not now).
PS: at some point you really need to give your bladder a break and stop, that is usually a great time to charge up.David and Peggy
2019 Ford F350 Lariat, 6.7L Diesel, Dually, Long Bed
Running with 20k Reese Goosebox (Love It) and Ford Factory "Puck" system.
Stopping with 8,000 lb Disc Brakes and Titan Hydraulic over Electric Brakes system.
Powering all this fun with 1200 Watts of Solar, two Tesla, Model S, battery modules, 24 volt Victron Inverter.
2018 Solitude 310 GK
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09-26-2020, 06:46 PM #45
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09-26-2020, 07:03 PM #46
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Originally Posted by [email protected]
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09-27-2020, 05:16 AM #47
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09-27-2020, 06:09 AM #48
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What it's worth is about as much as the video of Robert Downey Jr wearing the Iron Man suit. It's make believe for the TV.
Electric motors are fantastic for pulling, there's no question about it. My "beef" isn't that, it's much more logistics of first having a big enough "tank" to be useful for towing (500KHW+) an RV and then second, the logistics of getting enough power to refill that tank once you get where you're going.
If Ford released a diesel-electric F450 tomorrow, I'd be at the dealership looking at it. Electric motors are great, smooth, quiet, tons of torque. There's a lot to like there for towing. But batteries with 100's of KWH's, even if they work perfectly and don't weigh that much, just have logistical challenges that I don't see being solved anytime soon for the use case that I have pulling an RV. If I didn't have the RV and just used my truck as I used to, pulling trailers around town to pick things up, yeah, the Cybertruck or something like it probably would work. But when you start to combine 15,000 lbs of pulling, 100's a miles a day, rural locations, that's where the discussion falls apart for me. My next trip, in a few weeks, day 1 is about a 450 mile pull up RT81 to a secluded mountain town near West Virginia. RT81 is a major trucking route on the east coast, so, if we start to get some serious adoption of the semi, I'm sure that route will get the very high speed chargers, but, what about when I get there? I'll be driving 100's of miles there to go hiking, sightseeing, etc and trying to "refuel" my battery at the park, though possible, will take a very, very long time. Also, it looks like really my only electric option even on the drawing board pull 16K lbs on a 5er with enough battery capacity to be reasonable is the Tesla semi. Well, I don't want a semi, if I did, I'd have one for towing already!
Well, someone will just put the semi battery into a pickup, that'll fix your problem! Yes, maybe, not without technological breakthroughs though. The 500KWH battery weighs 5 tons, the 1MWH battery weighs about 8 tons. Batteries are improving quite rapidly, but I think we probably need to get down to 2-3tons per MWH before you'll be able to stuff enough battery in something the size of a dually pickup truck to actually build what I (and I think a lot of other RV'ers) would be interested in buying.
Take a 200HP diesel engine, couple it to a 100KW generator and a 250WH battery pack.. Now you've got something interesting to me, the power of electric with the range of what I currently have. Probably much better efficiency too because diesel engines can be tuned to be very efficient at a set RPM range. Let that thing chug away at 1800 RPMs producing power to recharge the batteries, probably last my lifetime before it let's go.
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09-27-2020, 11:28 AM #49
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For those who want a glimpse of the EV Future...
Watch Rivian's pre-production video showing the Rivian Pickup on the road (middle of video) in several environments.
Note: The Tank Turn is really special.
Note 2: the last quarter of the video shows the Rivian Pickup in some Very, Very remote places in South and Central America, Part of "The Long Way Up" video series available soon on Apple TV.David and Peggy
2019 Ford F350 Lariat, 6.7L Diesel, Dually, Long Bed
Running with 20k Reese Goosebox (Love It) and Ford Factory "Puck" system.
Stopping with 8,000 lb Disc Brakes and Titan Hydraulic over Electric Brakes system.
Powering all this fun with 1200 Watts of Solar, two Tesla, Model S, battery modules, 24 volt Victron Inverter.
2018 Solitude 310 GK
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09-27-2020, 03:38 PM #50
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The tank turn idea is awesome! Kind of like a skid steer, really neat!
The Rivian tops out at 180KWH though, so, while perhaps interesting for short hops, you'd be lucky to get much over 100 miles between charges towing a 5er. When we start seeing 500-1000KWH pickup trucks, then, as I discussed above, we're talking about something that might broadly be interesting to RV'ers. Until then, these things are perhaps great around town, and if you only do a repeatable short tow with your rig, might work for you, but it's nowhere near where it needs to be for many of us. Again, this isn't me hating on EV's, in fact, I like them a lot and helped a friend build one years ago, it was a blast and acceleration was mind boggling! This is me injecting "math" into the discussion and relating it to what it takes, from an energy point of view, to pull a 15-20K box down the road. And, on that front, is where EV's have a big issue; we can either put in massive batteries (like the semi), we can stop every 100-200 miles for quite awhile to charge, or we can put a generator on board. But it is simple math, there are ~35KW/h in a gallon of diesel fuel, with engine efficiency figured in, you wind up around 12-15KW/h per gallon. So, to simulate the 40 gallon gas tank I have in my F450, you need around 600MWH of battery capacity. Which, of course, is why the Tesla semi has 500 and 1000 KWH options available. Math is fun.
So, even if a Rivian could haul the rig, with 180KWH battery, you've basically got, at best, the equivalent range of my truck with 1/2 a tank (20 gallons of diesel). 150 miles before the light comes on, 190 or so to bone dry.
Very short version: This is a battery capacity discussion. Until we get to 500-1000 KWHs on board, you're not going far between charges with an EV towing a RV. And once we do get to 1000 KWH's on board, then we have the logistics of pulling down the same amount of power a typical house uses in a month in <1hr. Sure, it's simple to charge 1 truck at 1,000KW/hr, not at all simple to charge 100's at that speed, you're talking "substation level" power at that point. Add in even more, you're talking "power plant" levels of consumption.
To try to get this in perspective, let's think of a busy truck stop with 30-40 lanes for refueling. Let's say those lanes can service a little over 2 trucks per hour (to make math easy) and therefore, can refuel 100 trucks in 1 hour. If those trucks were all electric tomorrow, AND every diesel truck stop also had MW level chargers, well, what's the math look like? Well, to refuel 100 trucks in 1 hour, you'll need 100MW of electric. How much electric is that? I think this is where people just can't fathom the scale required here, so, let's relate it to something more familiar. A nuclear reactor is typically between 500 and 1000MW. So, fun way to look at it, 500 Tesla semis pulling down 1MW of power over a 1 hour "fill up" basically take the entire capacity of a nuclear reactor. Or, put another way, instead of 10,000 gallon diesel tanks under the ground in the gas station, they need a build a nuclear reactor and share it across a few gas stations to deal with the pull of the semis.
Extending 381m garage?
Today, 10:06 PM in General Discussion