Sur-Ron - New Mid drive Bike

[fechter]

Then i would install the best LiPos i could find and fill it up with resin (for safety against vibrations etc.)
In terms of BMS it could be hard to find one capeable of what BAC8000 can do (500-600A?), but you also could use something that does just voltage monitoring and tells you if one group has reached LVC. Then you stop manually.

It's possible the multi-pin connector on the stock pack can send a signal to somewhere to shut things down or switch to EP mode.

[liveforphysics]

[motomoto]

Hey Luke, looks like you are practicing for Mars. I think the Sur-ron bikes would be a great vehicle on Mars. You know,
for bar hopping and such...

[Rix]

[youtube

Pretty neat Luke, how long will that one stay stock?

[fechter]

[youtube

I bet the construction workers at that site would want one. I love the ending. Hopefully no broken ribs on that landing.

[Allex]

Nice camera Luke, really good night shooting

Found this:

[liveforphysics]

Congratulations my friend on getting real phase current! It awakes a beast in them with big phase current.

[ziltoid81]

There is something strange about the range I get on the Sur Ron. With the super moto wheels at 36 psi, I get about 30 mile range. With 1920 Whr, that works out to about 64 Wh / mi.

Got my raptor back running yesterday and measured today at my commute to work.
55-60kg bike, 85kg rider, 17 inch street tire on a mxus 3000.
I set the midi e to 60/120A and averaged at 33.6wh per mile without any pedaling......i wonder how the sur ron will do at the same conditions, cause i want it especially for legal commuting.

[n2mb]

There is something strange about the range I get on the Sur Ron. With the super moto wheels at 36 psi, I get about 30 mile range. With 1920 Whr, that works out to about 64 Wh / mi.

Got my raptor back running yesterday and measured today at my commute to work.
55-60kg bike, 85kg rider, 17 inch street tire on a mxus 3000.
I set the midi e to 60/120A and averaged at 33.6wh per mile without any pedaling......i wonder how the sur ron will do at the same conditions, cause i want it especially for legal commuting.

It is somehow much less efficient. Possibly because it goes much faster? Or because the belt / chain drive is less efficient than direct drive. Or both?

What was your average speed? I could compare to some of my rides. I know my average speed is higher than on my DD ebike, because I keep the throttle pegged when on 45 mph roads and average 45 mph...

[ziltoid81]

Flat road mostly......

[n2mb]

Flat road mostly......
2018-11-14-16-02-08.jpg

That might explain it. Your average is under 20 mph. My ride average is 28 mph, max is 48 mph. Lots of wind resistance at high speed. Also, more rolling resistance on the Sur Ron supermoto tires than bike tires. Although, on the same route, I rode my DD ebike and averaged 25 mph, max 40.5 mph and got just over 30 Wh / mi.

The Sur Ron is much heavier. My DD ebike was 60 lbs, the Sur Ron is 110 lbs. Also, the DD ebike had a sine wave controller, likely more efficient too. I'll see how adding the X Controller goes.

Anyway, even though the efficiency sucks, its still way more fun than the DD ebike I built and much less sketchy. It feels very solid at high speeds. Especially with the Super Moto wheels and tires. It gets about 30 miles range, which is enough for me.

I'm still thinking of rebuilding my DD e-bike as a lightweight commuter with a lightweight 2kw peak 8T Mac gear motor and a 660 whr battery. It should be about 50 lbs when done, which might be a little easier to get around town and into the office with. It should go 20 miles on a charge, but only top out at 30 mph. My commute is only 2 miles, so the Sur Ron is overkill.... But fun!

[ziltoid81]

I use a moto tire for the mxus and a bike tire for the front..... should be the same with you super moto setup.
But yeah im a little slower....... i rode intentionally without regen for better comparison, and when i do, i ride slower cause i can hear my brakes arguing what im doin.

It sucks that the homologated version still comes with the square wave controller, i want a sur ron pretty bad, but maybe its smarter to wait for a potential update for the legal version.
I need regen via button/lever.

[bigbore]

I bet lvc on the cells are set to 3V and this will give us about 2.6Ah per cell. Thats 28.6Ah Usable.
57.6V*28.6=1647Wh and not some imaginary 2000Wh. So lets be real here.
Add the bulky offroad motor tyres, belt and chain and you have a lot of drag compared to a hub motor.

I will soon re-cell my pack with 30Q cells and then its ready to be upgraded with ASI controller. X controller is great but if you know how to build bikes, why waste xtra 500bucks on it, better buy another controller.

Yeah
This is the Allex I know
Now my interest in this new toy is raising a lot ....

[ziltoid81]

The problem is that i need it to be street legal, otherwise alex is right, save the money for the x controller.

I already have an illegal bike, no need for another.

[fechter]

Does anybody have real data measured on a Sur-Ron?

[motomoto]

Just this on the original test bike from Sur-ron #27. The production version was a 20% jump in power and the x-controller adds
to that.

sur-ron dyno.png (35.58 KiB) Viewed 1265 times

[n2mb]

Just this on the original test bike from Sur-ron #27. The production version was a 20% jump in power and the x-controller adds
to that.sur-ron dyno.png

I don't think the production bike could be higher than the HP reported there. Someone measured it as 65 amps peak from the battery, which optimistically translates to 3900 watts. At 90% efficient (a guess), that would be 4.7 wheel horsepower.

[3DTOPO]

New startup (Renault-Nissan-Mitsubishi alliance) claims ~300 Wh/kg:

https://electrek.co/2018/11/13/renault- ... y-startup/

If so, a 6KW/h pack would weigh in around 20KG (plus some additional weight for the enclosure, wiring, etc.).

Has anyone weighed the stock pack? I am guessing it weighs 18 to 20 kg?

[ziltoid81]

The cells weigh in at 8kg naked.
I guess around 10 for the pack.

[3DTOPO]

The cells weigh in at 8kg naked.
I guess around 10 for the pack.

Wow, really? Sure feels heavier than that to me. I would weight it but weighs too much for my postal scale.

[3DTOPO]

The cells weigh in at 8kg naked.
I guess around 10 for the pack.

Hmm, well even at 8KG in cells, these new cells would be 2.4KW/h. But since they are rectangular, I bet one could fit in 20% more cells.

Which would make it 2.88kw/h, which is about 1kw/h more than the stock pack. I would buy one!

[ziltoid81]

I like tec thats actually available......

The pana pf gives you 9wh per cell at 2-3A till 3V. (i dont know when the stock bms trips)
Times 176=1584wh.(it seems the efficiency isnt that bad when you consider you have only 1,5kw/h usable, i forgot to calculate that properly)
With the samsung 35e you get appr. 11wh per cell, thats around 2000 usable wh, but not if you want to go crazy all the time......these affordable high cap cells usually dont like amps.
Then you go with 30q or something like that.

Maybe without spacers you can fit more cells, or you build a litte extender and place it under the seat.

[3DTOPO]

I like tec thats actually available......

The pana pf gives you 9wh per cell at 2-3A till 3V. (i dont know when the stock bms trips)
Times 176=1584wh.(it seems the efficiency isnt that bad when you consider you have only 1,5kw/h usable, i forgot to calculate that properly)
With the samsung 35e you get appr. 11wh per cell, thats around 2000 usable wh, but not if you want to go crazy all the time......these affordable high cap cells usually dont like amps.
Then you go with 30q or something like that.

Maybe without spacers you can fit more cells, or you build a litte extender and place it under the seat.

Thanks for that. I would agree that tech that is available is preferential. But going from 1.5KW/ to 2.0KW/h wouldn't really be worth the expense to me. Now, going from 1.5KW/h to nearly 3.0KW/h would be worth it.

I sent them an email asking if they had an estimate for availability. If I get a response I will share it.

[derb]

I installed a battery meter (https://de.aliexpress.com/item/100A-New ... 74edbe2f8a) and drove the battery empty until it stopped (at 6% rest).
The battery shuts off at 48V. I got 29.5Ah what exactly 1700Wh corresponds.
My average consumption after 1500km hard drive over trails is 43Wh / km or 27Wh / mile.

[Allex]

How many Amps did you see during peaks?
Here is a battery case extender with a new hatch. The pack is like 22s10p