arnis
Posts: 618
Joined: Sat Jan 23, 2016 3:21 pm
Delivery Date: 23 Jul 2014
Leaf Number: 015896
Location: Estonia, Europe

Re: Charging while driving

Wed Dec 28, 2016 8:20 pm

Technically I like the "pusher trailer" version :ugeek:
It is much more efficient that charging EV. Simpler. Cheaper.
It needs one gear that turns ICE at ideal RPM around 70-100km/h.
Ideal load range for maximum efficiency. Most likely 50-70% load.
Therefore combustion engine should be around 20kW or 26hp.
It should generate stable pushing force and everything else should
be done by Leaf. Aka going uphill, regen, braking.

This could be done with EV modification.
First of all autonomously trailer never engages at low speeds.
It engages only with driver "push" request and disengages as soon as brake lights
activate. Must be reliable wired connection with failsafe.
I imagine two pushing forces should be available.
Around 10hp and 20hp.
So technically only one tumbler switch for the driver and that's all.

Theoretically it might turn out as a profitable business. As all EV-s need only one trailer
model.
It would be really cheap in volume, as that pusher trailer does not require battery,
starter, generator. Not even cooling fan (as it never runs at slow speed).
It does need a clutch mechanism of some kind. Even dog clutch would work.
ICE engines that are so small don't really have a lot of "engine braking".

G2G, I must stop typing and go :lol:
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW

User avatar
EVDRIVER
Posts: 5763
Joined: Sat Apr 24, 2010 7:51 am

Re: Charging while driving

Wed Dec 28, 2016 10:14 pm

Push trailer = Fail. At every level, econ, safety, and it;s already moot.

sendler2112
Posts: 213
Joined: Wed Jan 06, 2016 5:05 pm
Delivery Date: 07 Jan 2016
Location: Syracuse, NY USA

Re: Charging while driving

Thu Dec 29, 2016 3:40 am

Not moot. Can't take a trip in a Leaf.

arnis
Posts: 618
Joined: Sat Jan 23, 2016 3:21 pm
Delivery Date: 23 Jul 2014
Leaf Number: 015896
Location: Estonia, Europe

Re: Charging while driving

Thu Dec 29, 2016 6:39 am

EVDRIVER wrote:Push trailer = Fail. At every level, econ, safety, and it;s already moot.


If you want your thought to be valuable you should at least try to justify them.
Explain your beliefs.
Telling that 20hp pushing force at higher speeds is somehow not safe is just a thought.
Which doesn't take into account vectors, traction and ways improve safety.
Telling that it is not economical (compared to other ways to propel EV) is even worse. Almost like a lie.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW

VitaminJ
Posts: 206
Joined: Tue Jan 03, 2017 11:46 am
Delivery Date: 07 Jan 2017
Leaf Number: 415775
Location: Morrison, CO
Contact: YouTube

Re: Charging while driving

Tue Jan 03, 2017 12:15 pm

Why use a trailer? Put the generator in a roof rack.
2013 Ocean Blue SV w/ QC and LED

PM me about converting your 120v EVSE to 240v

sendler2112
Posts: 213
Joined: Wed Jan 06, 2016 5:05 pm
Delivery Date: 07 Jan 2016
Location: Syracuse, NY USA

Re: Charging while driving

Tue Jan 03, 2017 12:32 pm

20kW generator is pretty heavy.

2011RedLeaf
Posts: 13
Joined: Tue Jan 03, 2017 8:49 pm
Delivery Date: 10 Oct 2012
Leaf Number: 3999

Re: Charging while driving

Tue Jan 03, 2017 9:09 pm

There have been some pushers made over the years. One guy "Sharkey" used his extensively, It was the front half of a diesel 1978 VW Rabbit with the rear quarter of a 1984 VW Cabriolet grafted on the back (http://www.evalbum.com/304). A few years ago, when his web page was active, he described several trips with it. It worked well for him. He ran it on home-brewed biodiesel. If I remember right, on long trips he would let it charge his 81 VW Rabbit EV conversion on the flat, then use both motors up the hill.
Another guy, Mike, used a 1988 Honda Civic. What used to be a 2,300lb car is now an 800lb pusher. (http://evconvert.com/article/ev-pusher)

arnis
Posts: 618
Joined: Sat Jan 23, 2016 3:21 pm
Delivery Date: 23 Jul 2014
Leaf Number: 015896
Location: Estonia, Europe

Re: Charging while driving

Wed Jan 04, 2017 2:50 am

Idea of trailer is that you almost never use it.
Therefore on daily commute you never need that.
Vehicle only has an appropriate hitch always mounted.

And one day when you need to travel for hundreds of miles you hook up the
trailer within 5 minutes, visit gas station and add some dinosaurs into the tank.
Then drive off the city on electricity and as soon as you enter "boring" mode
for hours you let the pusher trailer do 99% of the work. As soon as you run out
of dinosaurs you visit fuel station again. Leaf will not even notice the ease of
rolling.
And again the last part of the trip will be EV only as pusher doesn't operate at low
speed. Therefore no operation at intersections neither on winding roads.

And yes, one trailer for more than one potential user is also good. Makes it even cheaper.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW

VitaminJ
Posts: 206
Joined: Tue Jan 03, 2017 11:46 am
Delivery Date: 07 Jan 2017
Leaf Number: 415775
Location: Morrison, CO
Contact: YouTube

Re: Charging while driving

Wed Jan 04, 2017 10:34 am

The idea with the roof rack is you could put it in one of those aerodynamic cargo boxes, and it could be added and removed at your leisure. Also would not impact the footprint of the car, still park in a normal parking spot, etc. A roof box is almost certainly less drag than a trailer also. A generator that could power the car fully at 60mph is probably not small or light enough yet, but one that could extend range maybe an extra 50-100 miles or let you park and have lunch anywhere while it gives you some more boost could definitely be done and would be more useful IMO. Once you get a trailer, install a trailer hitch on your Leaf, then trailer insurance, licensing, finding storage, etc you could just buy an old Honda or Toyota for roadtrips. I don't see a U-Haul type trailer rental service worth it either, just plain trailers are expensive as heck to rent as it is and a big diesel generator is noisy and stinks.

Also surprised nobody posted this yet:
https://www.youtube.com/watch?v=VPMBR-imqUk
2013 Ocean Blue SV w/ QC and LED

PM me about converting your 120v EVSE to 240v

sendler2112
Posts: 213
Joined: Wed Jan 06, 2016 5:05 pm
Delivery Date: 07 Jan 2016
Location: Syracuse, NY USA

Re: Charging while driving

Wed Jan 04, 2017 11:04 am

15kW would just keep up. Might have to slow down into head winds. Weighs 536 pounds/ 243kg. Can't put that on any roof.
.
http://gens.lccdn.com/generaccorporate/ ... en-hsb.pdf
.

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