Ute-Camper conversion

Technical discussion on converting internal combustion to electric
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Traveler
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Ute-Camper conversion

Post by Traveler » Tue, 16 Jul 2013, 14:22

Hello all,

We are going to travel around Oz in a Toyota Landcruiser 70 series with a slide-on camper. The ute and camper will weigh in at around 3,500kg and we’d seriously like to look into the feasibility of going all electric.

This trip will involve off road driving and long km’s and these are two capabilities not normally associated with electric vehicles.

To allow me to do some preliminary feasibility studies and not focussing on cost’s, I’d like to understand if this is at all possible.

What sort of average km/amp hour/car mass ratio do most EV’s get? What sort of voltage do most EV's run off? I’m hoping that the km/amp hr/kg ratio will allow me to, assuming a roughly linear relationship to vehicle mass, to work out roughly what sort of battery pack and charging regime (top up with generator, solar cells etc) I’d need for targeting a certain distance in one charge.

Also, could you engineer the conversion to protect it from being submersed in a river crossing scenario?

Thanks.

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Johny
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Ute-Camper conversion

Post by Johny » Tue, 16 Jul 2013, 15:42

Can you figure out what carrying weight remains in the vehicle. I.e. How much extra weight can the conversion add?
Off-road means you would probably have to retain the gearbox and transfer case (if applicable) - which is all extra weight for a conversion.
I suspect that this is just too big a call for current battery technology.
A quick guess is that a 500kg (36kw/h) battery pack might take you 70 to 100km.

The river crossing is covered if you go with an AC motor (suitably IP rated) and care when designing the battery enclosures/wiring.

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Richo
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Ute-Camper conversion

Post by Richo » Tue, 16 Jul 2013, 20:42

So an IP67 minimum rating for everything Image

Sure an AC motor would do it.
But battery box and control systems etc will be difficult - could be done tho.

So something like this:
http://www.acmotorhomes.co.za/Landcruis ... Series.htm

So for 300km is ~100kWh (+1.4T) so $40k just for batteries.
Weight wise it doesn't really sound plausible on a vehicle already 3.5T

Recharge 100kWh even with a 20kVA(3-phase supply) would be an overnight charge.
20kVA gen would help.
http://www.kennards.com.au/index.php?fu ... ductid=212

You'd be lucky to fit 1kW of panels to the roof.
So that would be 5-6kWh a day or 5% of the pack.
20 days for a full solar recharge Image

So the real question is how far do you expect to go each day?
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peskanov
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Ute-Camper conversion

Post by peskanov » Thu, 18 Jul 2013, 02:11

I am also getting 100 kwh for 300 km, but I think you could get away with half of that just limiting your amps and driving slowly, something like 50-60 kmh (I am not sure if that's possible in Australian roads, it would be in a country like Norway).
These vehicles have horrible aerodynamics, if you check power consumption in bad aerodynamic cars you can see after 50 kmh air drag dominates.
Here is an example using a Jaguar:
http://kilowatt-house.com/kilowatt-car

The only practical way I can see to recharge this kind energy using the sun would imply using advanced CPV devices for 3 or 4 days. Like this one:
http://www.greenprophet.com/2011/04/2kw-solar-cell/
These concentrating devices require mechanical precision. That makes difficult to design them for continuous assembly/disassembly.

Lightening the vehicle as much as possible seems an easier path, imho.
Last edited by peskanov on Thu, 18 Jul 2013, 01:53, edited 1 time in total.

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acmotor
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Ute-Camper conversion

Post by acmotor » Thu, 18 Jul 2013, 04:20

This is a big ask for the current state of EV technology. At least price wise.
As usual, the motor is not the limitation, it is the battery pack.
Waterproofing is just a matter of attention.

I'd be thinking 100Wh/km/tonne so 100 x 100 x 3.5 = 35kWh/100km.
Oh yes, that is what is already suggested. Image

At least 100kW emotor (as a minimum) would be needed so system voltages are likely to be 300 or so volts so currents are kept to less than 4 digits.

It comes down to your expectations.
If 100km per day is the rate at which you want to circumnavigate Oz then that is OK. Hope you have a year to spare.

Perhaps pre-order a Mitsubishi PHEV 4WD outlander ?? Would be cheaper than trying to make a Landcruiser cruise the land.
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Richo
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Ute-Camper conversion

Post by Richo » Thu, 18 Jul 2013, 20:34

There are better batteries around if you ignore cost.
Even so I don't see it as a realistic conversion yet.

The only other option I can think of is changing to a different vehicle.
Perhaps a AWD Van converted to a 2-seater, pop out sides, drop down beds etc..
Probably not so comfortable for extended touring tho.
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Johny
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Post by Johny » Thu, 18 Jul 2013, 20:54

If you were retired, had about $60K to spare and wanted to prove a point. I think it would be possible to tour Australia and NZ almost indefinitely poaching charges off caravan parks that were less than 100km apart, or waiting few days at a time for the PV charge when they were further apart (assuming good weather - or a generator).

Other than that, IMO you have chosen the very thing that BEVs are the least good at - long trips in heavy vehicles.


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acmotor
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Ute-Camper conversion

Post by acmotor » Thu, 18 Jul 2013, 23:49

OK, now for the 40' e-Winnebago with the iMiEV on the trailer on the back ! Image
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Ute-Camper conversion

Post by Johny » Fri, 19 Jul 2013, 04:03

acmotor wrote: OK, now for the 40' e-Winnebago with the iMiEV on the trailer on the back ! Image
Not a bad idea if you had the dough. Even better would be a small DIY EV with ACIM - flat towed with an A-bar and remote regen control (done with a slightly modified electric brake controller) to slow the tow vehicle down on hills while charging the run-around-town pack.

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