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pianotuna

Regina, SK, Canada

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Posted: 09/29/21 10:42am Link  |  Print  |  Notify Moderator

250 miles

https://www.gobrightdrop.com/products/evs


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

TomD62

Texas

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Posted: 09/29/21 11:04am Link  |  Print  |  Notify Moderator

I do think hybrids are the future for RVs, at least the higher end ones. Electric motors make the same torque at 0RM as they do at full speed, 0RPM is where you really need the the HP of a ICE, not at top end, aside from hill climbing. The other thing is , once you climb the hill and are descending, you can get much of that energy back with an EV instead of wasting it in the brakes or Jake. For around town and in the park Pure EV will be nice , quiet and no fumes, on the highway, I do think you'll still need a diesel Genset, but that can be pretty efficient since it can run at a fixed , most optimum RPM. For example, a Tesla X needs 15kWh to maintain 60MPH for an hour. An RV is probably double that, so generating 10Kwh can extend the range of a 120kWH battery from 4hrs to 6 hrs of driving. You can stop and rapid charge, or boondock way far from a charger and let the genset bring it up slowly.

free radical

Canada

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Posted: 09/29/21 09:15pm Link  |  Print  |  Notify Moderator

TomD62 wrote:

I do think hybrids are the future for RVs, at least the higher end ones. Electric motors make the same torque at 0RM as they do at full speed, 0RPM is where you really need the the HP of a ICE, not at top end, aside from hill climbing. The other thing is , once you climb the hill and are descending, you can get much of that energy back with an EV instead of wasting it in the brakes or Jake. For around town and in the park Pure EV will be nice , quiet and no fumes, on the highway, I do think you'll still need a diesel Genset, but that can be pretty efficient since it can run at a fixed , most optimum RPM. For example, a Tesla X needs 15kWh to maintain 60MPH for an hour. An RV is probably double that, so generating 10Kwh can extend the range of a 120kWH battery from 4hrs to 6 hrs of driving. You can stop and rapid charge, or boondock way far from a charger and let the genset bring it up slowly.

Incorecto ,
at 0 rpm nothing happens bc motor isnt turning,
Try 1 rpm ! [emoticon]

free radical

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Posted: 09/29/21 09:28pm Link  |  Print  |  Notify Moderator

pianotuna wrote:

Hi,

I was sure this was coming--but not as soon as this!

https://www.yahoo.com/lifestyle/electric-adventure-rv-road-trip-180000971.html

Not to rain on your parade,but anyone can make cgi pics and claim all kinds of impresive numbers.
Remember Nikola ? Where is their truck.
How about Atlis?
List is long,real Evs are few.

Im sure EV motorhomes are coming,but not any time soon.
Takes lots of batteries to get that range.

free radical

Canada

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Posted: 09/29/21 09:34pm Link  |  Print  |  Notify Moderator

Workhorse would make a nice MH if it had decent range.

https://electrek.co/2021/09/23/workhorse........and-recalls-others-over-safety-concerns/

rlw999

Washington State

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Posted: 09/29/21 10:21pm Link  |  Print  |  Notify Moderator

free radical wrote:

TomD62 wrote:

... Electric motors make the same torque at 0RM as they do at full speed, 0RPM is where you really need the the HP of a ICE, not at top end, aside from hill climbing.

Incorecto ,
at 0 rpm nothing happens bc motor isnt turning,
Try 1 rpm ! [emoticon]


You can still have torque with no rotation -- torque is what starts the rotation, if you really had 0 torque at 0 rpm, you'd never start moving! Think of a beam style torque wrench, as long as you're pushing on the handle, you're imparting torque that you can measure on the scale, even if the bolt is not moving.

At 0 RPM you have 0 horsepower (since HP is the product of torque and RPM) but the instant the shaft starts moving, then you have HP.

time2roll

Southern California

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Posted: 09/29/21 10:43pm Link  |  Print  |  Notify Moderator

Actually an EV motor does have a torque curve.

Also torque is typically limited electronically at low rpm to avoid excessive wheel spin.

[image]


2001 F150 SuperCrew
2006 Keystone Springdale 249FWBHLS
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Timmo!

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Posted: 09/30/21 07:37am Link  |  Print  |  Notify Moderator

If we look under the hood of a train's locomotive we will see a large diesel engine that powers an electric generator that supplies electricity to powerful electric electric motors known as "traction motors".

https://en.wikipedia.org/wiki/Traction_motor

So this should diffuse any suggestion that electric motors lack torque or power.

Lynnmor

Red Lion

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Posted: 09/30/21 09:12am Link  |  Print  |  Notify Moderator

Timmo! wrote:

If we look under the hood of a train's locomotive we will see a large diesel engine that powers an electric generator that supplies electricity to powerful electric electric motors known as "traction motors".


That system is used in place of enormous transmissions and clutches.





Timmo!

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Posted: 09/30/21 09:23am Link  |  Print  |  Notify Moderator

Lynnmor wrote:

Timmo! wrote:

If we look under the hood of a train's locomotive we will see a large diesel engine that powers an electric generator that supplies electricity to powerful electric electric motors known as "traction motors".


That system is used in place of enormous transmissions and clutches.


And your point is?

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