6,000km off-road on an electric dirt bike...

edlaurence

1 mW
Joined
Jun 8, 2011
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Hi all,

Some of you guys might have seen my posts while I've been scrounging info for my project (thanks all! :D ). I've been working on the electric conversion of a dirt bike (Honda CRF450)for the last couple of years and have just returned from a really encouraging test trip in the Sahara where the bike performed well with good range and more than enough power from the twin Agnis (around 60kW) to tackle the big dunes. :shock:

After some further modifications, I'm planning to take the bike on a new challenge to trace the 6,000km Dakar rally route in Argentina and Chile with the help of my brothers. We'll be recharging from a portable solar array packed on the bike so that the ride itself is essentially emission-free and more importantly not constrained to the next fuel stop!

p1060059b.jpg


Having proved out the bike itself, the next step is the tough part. The project has been self-funded so far but its getting more serious now so we've kicked off a crowd-funding campaign (http://www.indiegogo.com/desertedev) as we need help so that we can make it to the starting line. This will fund the purchase of the 1.5kW solar array and a much-needed battery upgrade and then hopefully we'll be all set to start our expedition early next year (we're planning to set off in Feb/March).

My hope, if we're successful, is to give the EV's reputation a bit of a boost, and the expedition will also be a great opportunity to raise money for environmental charities (we've chosen Friends of the Earth and WWF). Any money that can be recouped from the bike and the kit purchased for the trip will also be donated.

It would be great to hear people's feedback and comments on the whole thing. You guys seem to know what you're talking about! :wink:

Thanks to Justin and Fechter for the help!

Ed
 
Haha, yep it's more than enough. We wanted to overspec the motors a little so they didn't work too hard as cooling is a bit of an issue. The Agnis are air-cooled which means we need to filter a clean air path to them which can be a little restrictive.

Cheers, Tom! Fingers crossed eh. :wink:
 
Hi Ed,

Nice project but I'm really curious to know how you can recharge you dirt I mean a 1.5 KW of solar array need allot of space and a 8 KW-hours battery pack didn't last long in desert with that power output (60KW) and it will takes several hours to recharge it, between ride no ?.

Good day!
Black Arrow
 
Hi Black Arrow,

Thanks for the Q's. The approx 1.5kW array is made up of 12 x 124W foldable arrays each which pack down to less than approx 1ft square and around an inch thick so we'll be able to pack all of these on the bike with a bit fiddling. When they're all unfurled they'll take up a considerable amount of space (I'll get back to you with this as I don't have that info to hand).

As for the range, on our test trip we ran the 74V 40Ah (approx 3kWh) battery pack for around 20Km in steep, soft dunes for around 30mins or so. This was running the cells from near max V (around 4.1V) down to no less than 3.5V so using only a safe % of the capacity which the solar array should be able to replace in a reasonable amount of time. The 60kW is the absolute max we can get out of the motors and we don't use anywhere near that kind of power when we're cruising at a decent pace on top of the sand.

Hope that helps.

Ed
 
Amazing work fellas, have you been coined EV Lawrence of Arabia yet?

sorry shit pun.

anyway glad someone is pushing Ebikes in this direction, looks a lot of fun.
 
Nice work man! This is a really monumental adventure and I wish you all the best.


Do you have trouble with all the sand and the Agni motors?
 
I too am very curious about the mechanics of carrying enough solar cells to charge your pack. Will enjoy following this. Good luck!
 
grindz145 said:
Nice work man! This is a really monumental adventure and I wish you all the best.


Do you have trouble with all the sand and the Agni motors?


Cheers, man! Yep it'll be a big one for sure. Just gotta get to the starting line and then start plugging away!

You're right we have had trouble with sand in the motors. On the Sahara test trip we wrapped the motors in fine mesh as a makeshift fix until we had time to come up with something more permanent and effective. Needless to say they didn't like this too much as the airflow was heavily restricted. Running twin Agnis helped though as they weren't working too hard. I'm off to the shop to the shop today to work on the drivetrain (we had some issues with drive chains running out of alignment on the trip) then we'll get onto the cooling issue. Will likely use a ducted/filtered airpath running from a pickup point high on the bike.

I'll get some more photos up when I have a chance!

Ed
 
pdf said:
I too am very curious about the mechanics of carrying enough solar cells to charge your pack. Will enjoy following this. Good luck!


Thanks for the interest, pdf! We've had some issues trying to track down the arrays we need as they're typically only used by the military or well-equipped expeditions (i.e. not too many restrictions on storage space :roll: ) but I'm hoping some guys over here in the UK will come through with the goods. I'll drop you an update when we've seen them and continue working on our packaging solution for them.

Cheers,

Ed
 
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