What If the Harvester Shed 1,000 lbs and Got Better? The Case for LTO + EA211-ERV

[ritterf]

e90 M3 / Jeep LJ Rubi owner · Preorder #3933623624 · replacing an X5 with this

I've been sitting on this for a while. Already sent it to Scout directly — got a very polished "thanks, noted" from support. So I'm bringing it here, where the people who actually care about this stuff are.

The Harvester has a real shot at being the most capable EREV ever built. But I think the current architecture direction is about to repeat the same mistake every other EREV has made. Here's what I mean — and here's the fix.

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THE PROBLEM: EREVs ARE JUST BLOATED EVs WITH A GENERATOR BOLTED ON

Every current EREV design makes you haul 1,200–1,500 lbs of low-C-rate NMC or LFP just to provide range. That weight spiral kills towing dynamics, destroys payload headroom, and wrecks off-road agility. It's engineering compromise stacked on engineering compromise.

And the cruel irony — you're carrying all that pack weight specifically so the generator doesn't have to work as hard. The tail is wagging the dog.

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THE PROPOSAL: A HIGH-RATE BUFFER ARCHITECTURE

Instead of a 80–100 kWh pack, pair two modular 10 kWh LTO (Lithium Titanate) packs with a purpose-built turbo generator. Total buffer: 20 kWh. Total pack weight: ~350 lbs vs ~1,400 lbs conventional.

For the generator: the EA211-ERV — the exact engine VW just put into production for the ID. Era 9X. 1.5L, Variable Turbine Geometry, Miller cycle, ~105 kW sustained output. Real production engine. Not a concept. Already validated in a large-platform application.

[ INSERT: Architecture diagram ]

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WHY TWO 10 kWh PACKS INSTEAD OF ONE 20 kWh PACK

This is the part I'm most excited about. Two modular packs changes everything:

Modularity across the lineup. Run one pack in the lighter Traveler build. Run both in the Harvester towing config. Same skateboard platform, two different buyers. Scout sells both without redesigning the chassis.

Serviceability. Replace one pack at a time if one degrades. ~$4,500 instead of $9,000+. A dealership swaps one in an afternoon. This is the crate engine philosophy applied to batteries.

Weight distribution. Two smaller packs gives chassis engineers real flexibility — one under each axle for 50/50 balance. Try that with a 1,400 lb monolithic slab.

VW group platform play. Here's the part that should get a VP's attention: a validated 10 kWh LTO module proven in worst-case truck duty is a group-wide asset. Audi, Porsche, Cupra, VW ID. Buzz — every EREV in the portfolio gets lighter, more durable, more serviceable batteries. Scout doesn't just ask VW for an engine. Scout hands VW the business case for their next battery standard.

"Scout isn't asking VW for parts. Scout is the validation platform for VW's next battery architecture."

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THE REAL-WORLD CASE: HIGH ALTITUDE MOUNTAIN PASS TOWING

This is where the architecture earns its money. The EA211-ERV's VTG turbo compensates for altitude power loss that kills naturally aspirated engines. The LTO buffer absorbs full regen on descents without thermal gating — consistent, predictable braking feel all the way down. And on the climb back up, the buffer delivers burst power while the generator sustains.

At 10,000 ft towing 5,000 lbs, a conventional EREV with a weak NA generator hits turtle mode. This architecture doesn't. The generator never stops. The buffer never gates. The truck never quits.

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WHY LTO WINS THE LONG GAME

[ INSERT: Cycle life / cost math graphic ]


20,000+ verified charge cycles — Toshiba SCiB production cells. At one full cycle per day that's 54 years. The pack outlasts the chassis by decades.

Full KERS capture. LTO absorbs 100% of hard regen energy on a mountain descent without thermal gating. NMC and LFP gate regen when the pack gets warm — you feel it as inconsistent brake response. LTO doesn't. Ever.

Long term replacement cost. When your 100 kWh NMC pack degrades in year 8–10, you're facing a $15,000–20,000 replacement that may not even be available. With two 10 kWh LTO packs doing 20,000 cycles — that conversation essentially disappears.

Tire life and payload. 1,050 lbs off the chassis is real tire wear reduction over a 15–20 year ownership cycle. Multiple sets of tires. On a truck people actually keep, that math matters.

The cost math works. LTO is ~3–4x per kWh vs NMC — but at 20 kWh vs 100 kWh you're buying a fraction of the cells. The delta funds a better generator, better suspension, and still comes out ahead.

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THE 30-YEAR TRUCK

Scout's heritage pitch is durability. A Harvester with this powertrain is the first EV-based truck that actually backs that up with physics. The battery outlasts the chassis. The generator is a production VW engine with a global parts supply. There's no $20,000 pack replacement hanging over the owner in year 10.

That's what "legendary Scout durability" means in 2025. Not a marketing line. An engineering decision.

"Two 10 kWh LTO packs + EA211-ERV = the first EREV that drives like a truck, lasts like a Land Cruiser, and costs like one too."

I'm not an engineer. I'm a preorder customer who's done the homework. Curious what the technically-minded people in here think — especially anyone who's worked with LTO chemistry or knows the EA211-ERV spec sheet better than I do.

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Ritter Friedrich · Preorder #3933623624
e90 M3 / Jeep LJ Rubi / replacing an X5

 

[J Alynn]

So I’ll be honest and say I skimmed after 3rd paragraph. Way too much info for me to pretend I wanted to know. So maybe I missed it but I think you mentioned proven tech, but who/what is using this and has been using it successfully for more than 3 years? There’s lots of great stuff right on the tipping point but I want proven tech. And to be fair -I fully intend on buying a BEV unless only chance at a launch edition is a harvester then I’ll consider it ILO full BEV. If there are active vehicles using this please share as I’d like to dig deeper. I would have assumed SM engineers would have explored that already if that is the case

 

[ritterf]

So I’ll be honest and say I skimmed after 3rd paragraph. Way too much info for me to pretend I wanted to know. So maybe I missed it but I think you mentioned proven tech, but who/what is using this and has been using it successfully for more than 3 years? There’s lots of great stuff right on the tipping point but I want proven tech. And to be fair -I fully intend on buying a BEV unless only chance at a launch edition is a harvester then I’ll consider it ILO full BEV. If there are active vehicles using this please share as I’d like to dig deeper. I would have assumed SM engineers would have explored that already if that is the case

Fair — I buried the lede. Short version:

The EA211-ERV just went into production in the VW ID. Era 9X, launched March 2026. Brand new but it's a production engine, not a concept — VW's words are "Golden Range Extender." That's the freshest proven data point.

LTO chemistry is older and well proven — Toshiba SCiB cells have been in Honda hybrids, Japanese grid storage, and transit buses for 10+ years. The chemistry isn't new, applying it as an EREV buffer is.

So to answer directly — the generator is months-old production, the battery chemistry is decade-proven. Neither is vaporware.

 

[ritterf]

So I’ll be honest and say I skimmed after 3rd paragraph. Way too much info for me to pretend I wanted to know. So maybe I missed it but I think you mentioned proven tech, but who/what is using this and has been using it successfully for more than 3 years? There’s lots of great stuff right on the tipping point but I want proven tech. And to be fair -I fully intend on buying a BEV unless only chance at a launch edition is a harvester then I’ll consider it ILO full BEV. If there are active vehicles using this please share as I’d like to dig deeper. I would have assumed SM engineers would have explored that already if that is the case

 

[J Alynn]

Fair — I buried the lede. Short version:

The EA211-ERV just went into production in the VW ID. Era 9X, launched March 2026. Brand new but it's a production engine, not a concept — VW's words are "Golden Range Extender." That's the freshest proven data point.

LTO chemistry is older and well proven — Toshiba SCiB cells have been in Honda hybrids, Japanese grid storage, and transit buses for 10+ years. The chemistry isn't new, applying it as an EREV buffer is.

So to answer directly — the generator is months-old production, the battery chemistry is decade-proven. Neither is vaporware.

Thanks for that tid bit

 

[ritterf]

 

[Mousehunter]

If the only goal is an electric power train (and the assorted benefits that come with it) - fine. If you want something that is primarily a plug-in EV. You would not have much daily range before firing up the engine - which is one of the most hated aspects of the plug-in hybrid Jeep. Nobody wants to plug in their vehicle nightly for 20 miles of electric range - unless it is a golf cart.

 

[Jkew]

This makes sense if you want a higher performance, but 95% of the time all I need or want is electric. I’m willing to pay for the extra weight to give me an electric commute.

I do think the EA211-ERV is really interesting. It looks like it is being manufactured in China but I wonder if it could be produced in Mexico.

 

[Scoutsie]

e90 M3 / Jeep LJ Rubi owner · Preorder #3933623624 · replacing an X5 with this

I've been sitting on this for a while. Already sent it to Scout directly — got a very polished "thanks, noted" from support. So I'm bringing it here, where the people who actually care about this stuff are.

The Harvester has a real shot at being the most capable EREV ever built. But I think the current architecture direction is about to repeat the same mistake every other EREV has made. Here's what I mean — and here's the fix.

---



I'm not an engineer. I'm a preorder customer who's done the homework. Curious what the technically-minded people in here think — especially anyone who's worked with LTO chemistry or knows the EA211-ERV spec sheet better than I do.

I’m also not an engineer (I used to work among them and had to translate their superior-brain ideas into plain English for people who were merely average-brained), and I’ve read this a couple of times, but I don’t understand this proposal. Could you please explain this like you’d explain it to a smart 10-year-old? My compliments to those who could understand this.

Less important: what is your day job? If you think this can work, why not apply for a job? If this is legit, I’d imagine that you wouldn’t want your idea taken without any proper compensation.

 

[SpaceEVDriver]

There are several misconceptions here.

• LFP is a far more mature battery technology than LTO. LFP was commercialized in 1991. LTO wasn’t commercialized until 2008.
• NMC and LFP both have more cycles than you suggest.
• LTO is less energy dense in both volume and in mass than either NMC or LFP
• The cost of NMC or LFP is significantly lower than you’ve stated and the cost of LTO is significantly higher per kWh than you’ve stated. As of August 2025, NMC and LFP were at $65 and $48/kWh, respectively. LTO is at about $200/kWh. I can buy LFP cells in consumer volumes for less than large manufacturers can buy LTO in large volumes.
• LTO cells have a much lower baseline voltage than either LFP or NMC, which means more cells in series to get up to reasonable voltages that would allow the higher charge rates. This means more expense in designing and building the batteries with proper thermal controls. LTO lifetime drops dramatically when charged/discharged above 25 Celsius.
• Nearly every BEV manufacturer has their batteries built in modules so that only one module would need to be replaced if something went wrong with a cell in that module. Some allow replacement of single cells, but that introduces additional complexities that can increase manufacturing costs.
• LFP has as high or higher safe charge/discharge rate than LTO.
• Once a vehicle is up to speed, the main thing mass matters for is safe stopping distance. Mass has almost no impact on range when range matters (on the freeway).

A more accurate table:

Battery Chemistry	Pack Size	Cost	BEV Range in miles (assuming 2.5 miles/kWh)	Years of service (based on 40 miles/day and number of cycles)	Mass (kg)	Volume (Liters)
NMC	140 kWh	Less than $9,000	350	With 8.75 days/cycle, 1500-2000 cycles you get 36-48 years before reaching 80% capacity	467-933	200-240
LFP	140 kWh	Less than $6700	350	8.75 days/cycle, 2500-9000 cycles is 60-215 years	700-1500	300-350
LTO	140 kWh	$28,000	350	8.75 days per cycle, 5000-10,000 cycles is 120-240 years.	1270-2333	700-800
LTO	70 kWh	$14,000	175	4.4 days per cycle, 5000-10,000 cycles is 60-120 years	635-1167	350-400
LTO	35 kWh	$7,000	88	2.2 days per cycle, 5000-10,000 cycles is 30-60 years	317-584	175-200
LTO	20 kWh	$4000	50	1.25 days per cycle, 5000-10,000 cycles is 17-34 years.	182-333	~115

To get the price, weight, and volume—volume is probably the biggest constraint---down to match NMC or LFP—including the engine, gasoline, and all that junk, you would only get no more than about 50 miles on an LTO battery. And you have no better lifetime. And no better charge rate. So the only thing you’ve gained is the need for a big gassy engine, which will add another $5k+ to your vehicle capital costs and much, much more cost per mile for fuel. So you’re back up to being more expensive, with an engine+battery taking up more room, the entire assembly being more massive, and a harsher, noisier ride. And you have a significantly more complex system. If they stick with LFP or NMC, and simply halve the battery size, they can keep 150-170 miles of pure electric, use a smaller engine, and still have the same result but with better all-electric range.

The biggest problem an EREV with any battery chemistry solves is range anxiety and in certain situations it enables towing longer distances with fewer stops. It could also, if engineered very well, provide solutions to certain problems experienced by people who live in extreme cold (-20 F or lower).

Most people don’t safely tow even close to 10,000 pounds even once in their lifetimes; most people don’t tow more than 50-100 miles from their homes; most people don’t need an EREV. EREVs are mostly a solution to an emotional problem (yes, with exceptions). That’s fine. Vehicles are emotional support tools for many people and you can’t necessarily tech your way out of that. When I rode a motorcycle, it was mainly for my mental health.

 

[Jkew]

I think you may also be overestimating the power that the EA211 would provide. Hopefully this isn’t a surprise to anyone, but this is a small engine. It’s much too small to take on the full burden of continuous mountain towing by itself and that is before the loss of conversion. The current harvester depends on the battery for a lot of stored power.

Honestly, if you were going this route I would give up the frunk, put a much bigger engine up there to reduce tongue weight.

 

[ritterf]

I’m also not an engineer (I used to work among them and had to translate their superior-brain ideas into plain English for people who were merely average-brained), and I’ve read this a couple of times, but I don’t understand this proposal. Could you please explain this like you’d explain it to a smart 10-year-old? My compliments to those who could understand this.

Less important: what is your day job? If you think this can work, why not apply for a job? If this is legit, I’d imagine that you wouldn’t want your idea taken without any proper compensation.

I was in IT exec Support... basically the bridge between engineers and Executives..
As for the job — I'm a stay at home dad. But if Scout wants to put me on a whiteboard for an afternoon I'll bring the coffee.

But

A much smaller lighter higher performance battery..
and a higher performance turbo engine which VW just designed exactly for this.

the LTO battery is much more stable, can be stored at 0v without degrading (great for shipping), charged like 10x faster than LFP..
but mostly instead of 1200lbs of cheap battery cells, you use 250lbs of high performance cells..
save $4,000 in battery pack.. pay about $1000 more for higher performance ERV.
much higher performance all around package. the harvester now with NA engine will go into turtle mode when towing at altitude.

..the Turbo won't care about altitude. So Wyoming, Colorado, a few more high altitude states.

 

[ritterf]

There are several misconceptions here.

• LFP is a far more mature battery technology than LTO. LFP was commercialized in 1991. LTO wasn’t commercialized until 2008.
• NMC and LFP both have more cycles than you suggest.
• LTO is less energy dense in both volume and in mass than either NMC or LFP
• The cost of NMC or LFP is significantly lower than you’ve stated and the cost of LTO is significantly higher per kWh than you’ve stated. As of August 2025, NMC and LFP were at $65 and $48/kWh, respectively. LTO is at about $200/kWh. I can buy LFP cells in consumer volumes for less than large manufacturers can buy LTO in large volumes.
• LTO cells have a much lower baseline voltage than either LFP or NMC, which means more cells in series to get up to reasonable voltages that would allow the higher charge rates. This means more expense in designing and building the batteries with proper thermal controls. LTO lifetime drops dramatically when charged/discharged above 25 Celsius.
• Nearly every BEV manufacturer has their batteries built in modules so that only one module would need to be replaced if something went wrong with a cell in that module. Some allow replacement of single cells, but that introduces additional complexities that can increase manufacturing costs.
• LFP has as high or higher safe charge/discharge rate than LTO.
• Once a vehicle is up to speed, the main thing mass matters for is safe stopping distance. Mass has almost no impact on range when range matters (on the freeway).

A more accurate table:

Battery Chemistry	Pack Size	Cost	BEV Range in miles (assuming 2.5 miles/kWh)	Years of service (based on 40 miles/day and number of cycles)	Mass (kg)	Volume (Liters)
NMC	140 kWh	Less than $9,000	350	With 8.75 days/cycle, 1500-2000 cycles you get 36-48 years before reaching 80% capacity	467-933	200-240
LFP	140 kWh	Less than $6700	350	8.75 days/cycle, 2500-9000 cycles is 60-215 years	700-1500	300-350
LTO	140 kWh	$28,000	350	8.75 days per cycle, 5000-10,000 cycles is 120-240 years.	1270-2333	700-800
LTO	70 kWh	$14,000	175	4.4 days per cycle, 5000-10,000 cycles is 60-120 years	635-1167	350-400
LTO	35 kWh	$7,000	88	2.2 days per cycle, 5000-10,000 cycles is 30-60 years	317-584	175-200
LTO	20 kWh	$4000	50	1.25 days per cycle, 5000-10,000 cycles is 17-34 years.	182-333	~115

To get the price, weight, and volume—volume is probably the biggest constraint---down to match NMC or LFP—including the engine, gasoline, and all that junk, you would only get no more than about 50 miles on an LTO battery. And you have no better lifetime. And no better charge rate. So the only thing you’ve gained is the need for a big gassy engine, which will add another $5k+ to your vehicle capital costs and much, much more cost per mile for fuel. So you’re back up to being more expensive, with an engine+battery taking up more room, the entire assembly being more massive, and a harsher, noisier ride. And you have a significantly more complex system. If they stick with LFP or NMC, and simply halve the battery size, they can keep 150-170 miles of pure electric, use a smaller engine, and still have the same result but with better all-electric range.

The biggest problem an EREV with any battery chemistry solves is range anxiety and in certain situations it enables towing longer distances with fewer stops. It could also, if engineered very well, provide solutions to certain problems experienced by people who live in extreme cold (-20 F or lower).

Most people don’t safely tow even close to 10,000 pounds even once in their lifetimes; most people don’t tow more than 50-100 miles from their homes; most people don’t need an EREV. EREVs are mostly a solution to an emotional problem (yes, with exceptions). That’s fine. Vehicles are emotional support tools for many people and you can’t necessarily tech your way out of that. When I rode a motorcycle, it was mainly for my mental health.

Genuinely appreciate the detailed pushback — some of this is fair and I'll own it.


You're right that my cost numbers were stale. LFP at $48-65/kWh changes the math — I had older figures. And LFP commercialization predates LTO, fair correction.


But I think we're arguing past each other on the core proposal. I'm not suggesting LTO as a BEV replacement — a standalone LTO pack for full range makes no sense, your table proves that. The proposal is a 20kWh LTO buffer paired with a sustained generator. In that context the comparison isn't "LTO vs LFP for range" — it's "which chemistry handles high C-rate charge/discharge cycles from a generator without thermal gating."


That's where the Toshiba SCiB spec matters. Their production cells are rated 20,000 cycles at 3C, 45,000 at 10C — significantly above the 5,000-10,000 you've cited. That's not marketing, it's their published datasheet.


On mass — respectfully, "mass doesn't matter at speed" holds for flat highway efficiency but breaks down completely for towing dynamics, payload rating, brake wear over 15 years, and off-road center of gravity. A truck that carries 1,000 fewer pounds has meaningfully better real-world capability in the use cases the Harvester is actually being marketed for.


The altitude/turtle mode point stands unanswered — a naturally aspirated generator loses ~3% power per 1,000ft. The EA211-ERV's VTG compensates. That's not emotional, that's physics.


You're right that most people don't tow 10,000 lbs. But the people buying a Harvester specifically are not most people.

 

[ritterf]

I think you may also be overestimating the power that the EA211 would provide. Hopefully this isn’t a surprise to anyone, but this is a small engine. It’s much too small to take on the full burden of continuous mountain towing by itself and that is before the loss of conversion. The current harvester depends on the battery for a lot of stored power.

Honestly, if you were going this route I would give up the frunk, put a much bigger engine up there to reduce tongue weight.

You're right — and I should have been clearer. The engine critique you're making is aimed at the NA EA211 Scout is planning, not the ERV variant I'm proposing. They're meaningfully different:

NA EA211 (planned)	EA211-ERV (proposed)
Output	~77–81 kW	~105 kW
Induction	Naturally aspirated	VTG turbo
Cycle	Otto	Miller
Altitude compensation	None	VTG adjusts boost
Designed for ERV duty	Adapted generator use	Built explicitly for it

At altitude the NA loses roughly 3% power per 1,000ft — no boost to compensate. At 10,000ft you're down to maybe 55–60 kW sustained. That's where turtle mode lives when you're towing.
The ERV's VTG manages boost across the altitude range — 105 kW at sea level, still close to 105 kW at 10,000ft. That's not a small difference for anyone towing through Wyoming or Colorado.
The frunk/bigger engine idea is creative but you'd be moving weight forward onto the front axle — which kills approach angle and front-end balance off-road. The whole point of the rear-mounted serial layout is keeping combustion compact and centered.

 

[ritterf]

This makes sense if you want a higher performance, but 95% of the time all I need or want is electric. I’m willing to pay for the extra weight to give me an electric commute.

I do think the EA211-ERV is really interesting. It looks like it is being manufactured in China but I wonder if it could be produced in Mexico.

Totally fair — and honestly if 95% of your driving is electric, BEV is probably the right call. The Harvester is really for people whose 5% includes a mountain pass with a trailer.


On the 20kWh LTO pack for daily driving — 90% of commutes are under 40 miles. That pack covers it comfortably. And at high C-rate it charges dramatically faster than LFP. When you do need the generator it's there — but most Harvester owners will probably touch the gas tank less than they expect.


One thing people don't factor into the "I'll pay for the extra weight" math — that 1,000 lbs doesn't disappear after you buy the truck. It's on your tires every mile, on your suspension every bump, on your brakes every stop. Over a 15–20 year ownership cycle that's multiple sets of tires, accelerated ball joint and bushing wear, and brake rotors that go faster than they should. The weight tax compounds quietly for years after purchase.


On the EA211-ERV manufacturing — the ERV launched with SAIC in China for the ID. Era 9X, but the EA211 family is already built at VW's Guanajuato plant in Mexico. The infrastructure exists. Whether Scout could source the ERV variant from Silao is a real question — and given the current tariff environment, a timely one.


Sounds like you want the BEV Traveler though. Which honestly might be the right truck for you.

 

[ritterf]

Let me put my own use case on the table — because I've been running these numbers against my own life.


Daily driver: school runs, 3 miles each way, 4–6 times a day. That's maybe 18–24 miles. The 20kWh LTO pack handles that without the generator ever starting. Every morning it's full. Fine.


The other 10%: weekend camping trips into deep southeastern Oregon desert. Burns, Steens Mountain, Alvord Desert — 8 hours from home. Wife wants a camper. We're talking a 6,500 lb trailer.


Here's where I had to stress test my own proposal.


Santiam Pass, US-20. 4,817 ft elevation. 6% sustained grade west side. 70 mph. 6,500 lb trailer.


Combined rig weight: Scout ~6,500 lb + trailer 6,500 lb = 13,000 lb

• Grade climbing power at 70 mph: ~112 kW
• Aero drag at 70 mph on bluff trailer combo: ~42 kW
• Rolling resistance: ~12 kW
• Total sustained demand climbing: ~166 kW

The NA EA211 planned for the Harvester: ~77–81 kW


That's less than half. The battery carries the other 85+ kW the entire climb. By the summit you've burned deep into the pack — and you're still 6 hours from the Alvord Desert with nothing but high desert and rolling grades ahead.


The EA211-ERV at 105 kW sustained closes the gap but still can't solo that grade. The LTO buffer has to work hard on the climb and recover on the descent.


Honest conclusion: For my specific use case — school runs 90% of the time, then dragging a 6,500 lb camper over Santiam Pass into the Oregon outback — even the ERV architecture is working at its limits on the climb. It handles it, but there's no margin left for AC, elevation-adjusted losses, or a headwind on a hot August day.


What this tells me is the dual 10kWh modular pack idea matters even more than I thought. The buffer size is the variable Scout can tune per trim level. Harvester Base: 20kWh. Harvester Tow: 30kWh with the second pack. Same generator, same skateboard, different buffer for different buyers.


That's the flexibility a modular LTO architecture actually enables — and a monolithic LFP pack can't.

 

[ritterf]

looked into who is using LTO now..
here's who's actually using it right now:


Transit & rail — Siemens Mireo Plus B trains (April 2024, Toshiba SCiB cells, 15 year service rating). London's New Routemaster double-deckers. Microvast's Chongqing bus fleet — 37 buses, 80 kWh LTO packs, full charge in under 10 minutes, running since 2011.

Automotive — Mitsubishi i-MiEV and Honda Fit EV in Japanese market. Honda EV-neo electric bike.

Military & grid — Altairnano's grid storage systems. Grinergy military-grade LTO. US DOE backed programs.


Anywhere the duty cycle is brutal and downtime is expensive, LTO wins. Transit buses running 20 hours a day. Trains that can't afford to sit on a charger. That's exactly the duty cycle of a truck that needs to tow over any mountain pass and be ready again Monday morning.

Consumer EVs chasing EPA range numbers don't need LTO. A truck with a generator that needs a fast, durable, thermally stable buffer absolutely does.

Trying to prevent the viral video of the new heritage brand Scout failing a simple towing test..
or having people say I don't want to spend $15,000 to replace the battery in 12-15 years.. when you can say its $5,000 in 30 years..
or just trying to offroad in a 1000lb heavier truck than needed.. going to get stuck in the sand at the beach..
slide off the road on icy day...

 

[ritterf]

The Harvester LTO + EA211-ERV: The "Hardest to Kill" FAQ


Addressing the common pushback — because the Harvester isn't for everyone, and that's the point.

---

Q: "Why only 40 miles of EV range? Most EREVs are pushing 100+ now."


Because we're building a truck, not a commuter appliance. To get 100 miles of EV range in a vehicle this size you have to carry ~1,200 lbs of LFP or NMC. That dead weight kills payload, ruins towing dynamics, and turns a capable off-road truck into a lead sled.


The 20kWh LTO buffer covers 90% of daily commutes — school runs, errands, the hardware store — without the generator ever starting. When you need to get a horse trailer over a mountain pass in a blizzard, the generator doesn't care. It just runs.


Casual EV buyers should buy the Traveler BEV. The Harvester buyer wants capability, not a bigger number on a spec sheet.

---

Q: "LTO is too expensive. The math doesn't work for a $60k truck."


The math actually favors LTO when you look at the full system — not just the cell cost.

• 70kWh LFP at today's market rate (~$50–65/kWh) = ~$4,200 in cells. Weighs 1,000+ lbs. Limited C-rate.
• 20kWh LTO at ~$350/kWh = ~$7,000 in cells. Weighs ~350 lbs. 10C+ charge/discharge.

Yes — LTO costs ~$2,800 more in cells. That delta is recovered in suspension components that don't wear out prematurely, tires that last longer, and structural reinforcement you don't need to build. Over a 15-year ownership cycle on a truck people actually keep, the math inverts.


And when your LFP pack degrades in year 9, you're looking at a $10,000–15,000 replacement. The LTO pack at 20,000+ cycles will still be at 80% capacity when the chassis rusts out.

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Q: "A 1.5L engine in a big truck will scream under load and fail."


That's true of a naturally aspirated buzz-box. The EA211-ERV is a different animal entirely.


It's a dedicated 105kW generator built with Variable Turbine Geometry and Miller cycle — designed from the ground up for sustained serial hybrid duty in the VW ID. Era 9X. It doesn't rev to match your throttle foot. It sits at its peak efficiency RPM and stays there, keeping the buffer topped up regardless of what the truck is doing.


Critically — VTG compensates for altitude. The NA EA211 Scout is currently planning loses roughly 3% output per 1,000 ft. At 10,000 ft you're down to maybe 55–60kW sustained. The ERV's turbo manages boost across the altitude range. It doesn't notice Wyoming.

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Q: "Now I have an engine AND a battery to maintain. That's twice the complexity."


You're not adding complexity — you're trading catastrophic complexity for predictable maintenance.


The battery: LTO is 0V stable, thermally inert, and rated 20,000+ cycles. It will outlast the chassis. There is no $20,000 brick replacement hanging over your head in year 10. The chemical failure rate over a 20-year window is effectively zero.


The engine: The EA211 is a global VW platform engine. Parts are available at any VW service center on earth. Oil changes every 10,000 miles. That's it.


Compare that to praying a proprietary 1,000 lb LFP slab doesn't fail out of warranty with no affordable replacement path.

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Q: "141 hp isn't enough to tow over a mountain pass."


Towing isn't about peak horsepower. It's about thermal headroom.


Here's the real math: pulling a 6,500 lb camper over Santiam Pass on US-20 at 70 mph requires ~166kW of sustained power on a 6% grade. No single generator handles that alone — that's not the architecture. The generator sustains cruise load while the LTO buffer handles surge demand on steep sections. At 10C discharge, LTO dumps power fast when the grade spikes. The generator recharges the buffer on the descent. The system runs as a loop, not a one-way drain.


In a heavy LFP truck, the battery gets hot, regen gets gated, the NA generator hits its ceiling, and you get turtle mode 45 minutes from nowhere. This architecture doesn't gate. It doesn't quit. It manages the grade as physics — not as a warning light.

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Q: "Scout is a startup. They should stick to proven, commodity tech."


The EA211-ERV went into production March 2026. It's not a concept. LTO chemistry has been running London's double-decker bus fleet since 2014, Siemens trains since 2024, and transit fleets in China since 2011 — everywhere the duty cycle is brutal and downtime is expensive.


That's exactly the duty cycle of a truck that needs to cross a desert, climb a pass, and be ready for school runs on Monday morning.

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Scout shouldn't build the easiest truck to manufacture.


They should build the hardest truck to kill.

 

[GrumpyG]

e90 M3 / Jeep LJ Rubi owner · Preorder #3933623624 · replacing an X5 with this

I've been sitting on this for a while. Already sent it to Scout directly — got a very polished "thanks, noted" from support. So I'm bringing it here, where the people who actually care about this stuff are.

The Harvester has a real shot at being the most capable EREV ever built. But I think the current architecture direction is about to repeat the same mistake every other EREV has made. Here's what I mean — and here's the fix.

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THE PROBLEM: EREVs ARE JUST BLOATED EVs WITH A GENERATOR BOLTED ON

Every current EREV design makes you haul 1,200–1,500 lbs of low-C-rate NMC or LFP just to provide range. That weight spiral kills towing dynamics, destroys payload headroom, and wrecks off-road agility. It's engineering compromise stacked on engineering compromise.

And the cruel irony — you're carrying all that pack weight specifically so the generator doesn't have to work as hard. The tail is wagging the dog.
View attachment 14471


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THE PROPOSAL: A HIGH-RATE BUFFER ARCHITECTURE

Instead of a 80–100 kWh pack, pair two modular 10 kWh LTO (Lithium Titanate) packs with a purpose-built turbo generator. Total buffer: 20 kWh. Total pack weight: ~350 lbs vs ~1,400 lbs conventional.

For the generator: the EA211-ERV — the exact engine VW just put into production for the ID. Era 9X. 1.5L, Variable Turbine Geometry, Miller cycle, ~105 kW sustained output. Real production engine. Not a concept. Already validated in a large-platform application.
View attachment 14475
[ INSERT: Architecture diagram ]

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WHY TWO 10 kWh PACKS INSTEAD OF ONE 20 kWh PACK

This is the part I'm most excited about. Two modular packs changes everything:

Modularity across the lineup. Run one pack in the lighter Traveler build. Run both in the Harvester towing config. Same skateboard platform, two different buyers. Scout sells both without redesigning the chassis.

Serviceability. Replace one pack at a time if one degrades. ~$4,500 instead of $9,000+. A dealership swaps one in an afternoon. This is the crate engine philosophy applied to batteries.

Weight distribution. Two smaller packs gives chassis engineers real flexibility — one under each axle for 50/50 balance. Try that with a 1,400 lb monolithic slab.

VW group platform play. Here's the part that should get a VP's attention: a validated 10 kWh LTO module proven in worst-case truck duty is a group-wide asset. Audi, Porsche, Cupra, VW ID. Buzz — every EREV in the portfolio gets lighter, more durable, more serviceable batteries. Scout doesn't just ask VW for an engine. Scout hands VW the business case for their next battery standard.

"Scout isn't asking VW for parts. Scout is the validation platform for VW's next battery architecture."

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THE REAL-WORLD CASE: HIGH ALTITUDE MOUNTAIN PASS TOWING

This is where the architecture earns its money. The EA211-ERV's VTG turbo compensates for altitude power loss that kills naturally aspirated engines. The LTO buffer absorbs full regen on descents without thermal gating — consistent, predictable braking feel all the way down. And on the climb back up, the buffer delivers burst power while the generator sustains.

At 10,000 ft towing 5,000 lbs, a conventional EREV with a weak NA generator hits turtle mode. This architecture doesn't. The generator never stops. The buffer never gates. The truck never quits.

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WHY LTO WINS THE LONG GAME
View attachment 14474
[ INSERT: Cycle life / cost math graphic ]


20,000+ verified charge cycles — Toshiba SCiB production cells. At one full cycle per day that's 54 years. The pack outlasts the chassis by decades.

Full KERS capture. LTO absorbs 100% of hard regen energy on a mountain descent without thermal gating. NMC and LFP gate regen when the pack gets warm — you feel it as inconsistent brake response. LTO doesn't. Ever.

Long term replacement cost. When your 100 kWh NMC pack degrades in year 8–10, you're facing a $15,000–20,000 replacement that may not even be available. With two 10 kWh LTO packs doing 20,000 cycles — that conversation essentially disappears.

Tire life and payload. 1,050 lbs off the chassis is real tire wear reduction over a 15–20 year ownership cycle. Multiple sets of tires. On a truck people actually keep, that math matters.

The cost math works. LTO is ~3–4x per kWh vs NMC — but at 20 kWh vs 100 kWh you're buying a fraction of the cells. The delta funds a better generator, better suspension, and still comes out ahead.

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THE 30-YEAR TRUCK

Scout's heritage pitch is durability. A Harvester with this powertrain is the first EV-based truck that actually backs that up with physics. The battery outlasts the chassis. The generator is a production VW engine with a global parts supply. There's no $20,000 pack replacement hanging over the owner in year 10.

That's what "legendary Scout durability" means in 2025. Not a marketing line. An engineering decision.

"Two 10 kWh LTO packs + EA211-ERV = the first EREV that drives like a truck, lasts like a Land Cruiser, and costs like one too."

I'm not an engineer. I'm a preorder customer who's done the homework. Curious what the technically-minded people in here think — especially anyone who's worked with LTO chemistry or knows the EA211-ERV spec sheet better than I do.

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Ritter Friedrich · Preorder #3933623624
e90 M3 / Jeep LJ Rubi / replacing an X5

I like this. I would switch back to Harvester for something like this.