ERider 8000W scooter - Australia (similar to xm5000li)

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branng
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

I'd be interested in your solution for the shake, as my front end has gotten worse with severe judder under hard braking, grabbing and the existing shake between 50kph and 60kph. I'm about to remove the front end and check through everything. I do suspect that I'm getting some shake from the back end as well as it feels to be under the seat. hard to tell exactly

As far as I can tell, most of my judder comes from the rear of the bike (according to my backside sensor). I don't suffer from any such issues on the front end, not that I've noticed anyway.

That said, I have noticed the bike occasionally doing a death wobble when letting go of the handlebars while slowing down on regen, but I can't seem to get this issue to repeat itself on a consistent basis. I'm also an avid cyclist and in that community, death wobbles are commonly attributed to misaligned forks; even a marginal misalignment - we're talking millimetres here - could potentially result in a bike doing the death wobble. So I'm guessing there could be a fork design issue with the eRider VKs.

On the rear end of things, I've simply stuck a couple of neodymium magnets on rim of the wheel/motor. As I said, it hasn't cured the judder entirely, but has gotten rid of a good 70-80% of it. Then again, I simply haven't had the time as of late to take the wheel/motor off and stick it on a static balancer. So far, it's just been a case of 1. Stick magnet at position X 2. Check if judder has gotten worse 3. If judder has gotten worse, stick magnet at position Y 4. Repeat 3. until judder gets better 5. Check if more weight reduces judder further. See below pic for "inspiration" (sorry for the quality, took a quick snap with my phone).

...with a small controller on top (not a Sevcon, but something like Sevicam or similiar. whatever it is, it work very well

I'm guessing it's the Sabvoton, like on mine. Apparently, they're a relatively new player, but look like they're churning up some pretty good controllers! Absolutely no qualms with mine!

Does your bike have a throttle delay like mine does? Especially noticeable when letting off throttle and only having regen kick in like half a second later. I had initially thought of it a mere annoyance which I'd put up with. But I've come across situations where I'm accelerating and find myself suddenly having to hit the brakes. And in those moments, I'd like for the bike bike to stop accelerating and for regen to kick in immediately.

Apparently Sabvoton programme their controllers with a 300ms throttle input delay by default, although this is configurable with the right programming harness + software.

MEroller
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

@ branng: With the motor you are using the the best solution for balancing it, but you should really take your time doing that. I don't know how you could put the motor on a static balancer. That would only make sense if you can mount the motor axle between centres, AND the centres in the axles are actually in the centre (o.k. center for the N.A. folks :-) of the wheel rim.

AND, if you are putting expensive rare earth magnets on your motor anyway, why not use some for your CA pickup? I use two opposite each other, but had to extend the sensor cable to get back there. The sensor (actually just a reed contact...) can be mounted to one of the shocks. Then you don't have to fiddle with the hall sensors of the motor, nor with surface-mounted capacitors on the CA circuit board ;-)

@ jonnyfive: Front wobble with erider scooters can have a number of reasons:
1. unblanced front tyre or wheel
2. not enough or too thin damper oil in the shocks
3. low grade mainland-Chinese front shocks. Apparently a change to identical looking Taiwanese shocks can already improve things, but your VK should already have those...
4. play in the head bearings. They need to be tightened for just a tad of resistnace to turning. ANY bit of play in there can lead to catastrophic emergy braking judder!
5. Different shock lengths. That is hard to measure exactly, but alos something ot look into.

The wobble when letting go of the handlebars at speeds around 20 to 50km/h is just resonance, and is VERY easy to eliminate: Always keep at least one hand firmly on the handle bars :-)

My rides:
2017 Zero S ZF6.5 11kW, erider Thunder 5kW

pcarlson1979
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

Hey, welcome back Phil!!

Thanks for that, I'll give it a go soon. As you may have read, I'm having some troubles with the front end. Eric has given his blessing for me to do an in depth investigation into it. So a big strip down and check everything will be underway soon.

But I am still very impressed with the bike. BTW, the new speedo (mine at least) is dead accurate against a GPS, so at least I don't have to guess my speed, although the CA will confirm that shortly

That's great to hear it's going good. The shaky front end I can't help with. Our two scooters VK model are fine at all speeds 0kmh-105ish. Even the two thunderbolts sold in Canberra are going fine. The owner has just passed 19,000km and needs some new tires!! He overtook me in a year!

Yes, my charger just sits on 10.1A but sometimes will vary from 9.8A to a maximum of 10.2A. But it slows does as the bike gets full with only 2Ah remaining. I'd LOVE to see 16+A that would be amazing! Maybe I should just install a port insode so the 10A charger stays inside the bike and I can use the 20A charger in parallel by pluggin in seperately!! That would be a nice 30A!!!! But after 2 years at 10A (5 hour charge) I'm happy to keep it as it is.

------------------------------
eRider 8000w Scooter - PDT Version
72v 50AH CHL battery
350A Sevcon controller

24km: Delivered - 24 September 2011
2490km: Installed dual 35w HID lights Bi-Xenon Projectors - 27 November 2011
8313km: Installed BMS -

branng
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

@ branng: With the motor you are using the the best solution for balancing it, but you should really take your time doing that. I don't know how you could put the motor on a static balancer. That would only make sense if you can mount the motor axle between centres, AND the centres in the axles are actually in the centre (o.k. center for the N.A. folks :-) of the wheel rim.

Point taken. But in lieu of my schedule, I was happy to trade 10 minutes of my time to get a 70-80% fix, but for the time being, not 2 hours to get the solution 100% fixed.

AND, if you are putting expensive rare earth magnets on your motor anyway, why not use some for your CA pickup? I use two opposite each other, but had to extend the sensor cable to get back there. The sensor (actually just a reed contact...) can be mounted to one of the shocks. Then you don't have to fiddle with the hall sensors of the motor, nor with surface-mounted capacitors on the CA circuit board ;-)

I'm not running a CA... Maybe I should get one...

The wobble when letting go of the handlebars at speeds around 20 to 50km/h is just resonance, and is VERY easy to eliminate: Always keep at least one hand firmly on the handle bars :-)

That's my fix!

15-11-2013 Update: My first spill. A cautionary tale.

So was commuting on my usual route to work yesterday (a toasty 3 degrees celsius at the time) and was coming up to one of the corners which I take every single time on that particular route at a good 50-60km/h. In other words, it's not much of a corner, just a straight section of road with an angle in it. I saw that the street sweepers went by that stretch of road, so the asphalt was wet at the time. Realising that, I thought it'd be wise to slow down - I was probably down to 40-50km/h BEFORE entering the corner. No throttle in the corner. Just as I started leaning in, I had a major sh*t-in-the-pants moment as I felt the rear end of the bike slip. I somehow managed to catch it, but just as I did, the rear end of the bike suddenly slipped again and I lost control of the bike, which gradually angled left (perpendicular to the direction of travel). I fell off the bike at that point.

I was in full gear (ATGATT!), so thankfully, nothing but a sore bottom and a damaged ego. And thankfully, the car behind me was paying attention and not texting away on his/her mobile phone (a rarity in Beijing!) and came to a stop (rather than ploughing on and running over me).

The bike - while scratched up - only suffered from what I can tell, cosmetic damage. Surprising, given that it felt like a pretty hard fall, and the bike continued skidding on its side a good 5 - 10 meters ahead of the point where I fell.


I was obviously shaken, but also rather surprised at why I spilled. As far as I was aware, I did everything by the textbook. Perhaps an unsighted patch of oil on the road? I really am curious whether it was possibly the brake regen which caused the rear end to go loose and thereby, initiating the whole sequence of events. Any thoughts?

LeftieBiker
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

I think that the sweepers duplicated what happens when it first starts to rain: oil seeps up out of the pavement and makes the street *very* slippery for a few minutes, until it gets washed away. In your case it didn't get washed away. The first few minutes of rain, especially after a long dry spell, are very dangerous for bikes. I'm sorry for your fall, but glad it wasn't a bad one.

MEroller
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

My my, good riding gear is a REAL blessing in such instances!!!
Part of the problem could be your tires. That was the first thing I almost immediately replaced after I got the bike. But as you are in China safer tires for everyday use (which does include wet roads..) might be harder to come by. I ride German Heidenau K62 all-weather tires, ALL year, and they hold like tack on wet roads too.

Regen should only set in if you pull a brake lever. If in your ride regen is started when the "throttle" grip is put in idle position, then your fall could have well been caused by regen kicking in. That is why I keep regen to the brake levers...

Safe riding!

My rides:
2017 Zero S ZF6.5 11kW, erider Thunder 5kW

pcarlson1979
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

Ouch!! That's terrible Braang.

I'm glad you're OK. Dress for the slide....not the ride!

The bike doesn't look that bad actually, considering it took a fall. I have my regen set to mode 1 which means the more I roll off throttle, the more regen happens. I have tried the other modes and don't like the brake level one simply because it switches in a pre-set amount of regen rather than gradually increasing it. I don't like NO regen as it doesn't feel right to me, it's amazing how much braking the regen does. Then I tried double regen and that was too much.

You can chose one of 5 regen modes to your scooter.

1. regen slowly increases as you turn throttle to 0%

2. First 25% of throttle has no regen. Regen will apply as you move throttle from 100% to 25%

3. Manual and will apply as you press start button.

4. Brake lever activation. Regen turns on when brake lever is used.

5. Double regen to a quick full stop

Changing regen modes:

* Turn on the ignition key

* green led is blinking

* take throttle to max

* green led will turn off

* press start button 1 time

* throttle back to 0

* green led will blink in 1 blink sequence.

Same way to do it to program up to 5 regen modes by pressing the start button as the regen mode wanted.
The green led will blink at the regen mode programmed.

* regen 1 will be 1 blink
* regen 2 will be 2 blinks
* regen 3 will be 3 blinks
* regen 4 will be 4 blinks
* regen 5 will be 5 blinks

------------------------------
eRider 8000w Scooter - PDT Version
72v 50AH CHL battery
350A Sevcon controller

24km: Delivered - 24 September 2011
2490km: Installed dual 35w HID lights Bi-Xenon Projectors - 27 November 2011
8313km: Installed BMS -

Johnny J
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

Don't think he has the "Plug-In-drive-tech" or a Sevcon controller...

IFIMotors
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

This options are only on PDT (Plugin Drive Tech) systems, nothing to do with Sevcon.

We use Sevcon as our power drive but all the system is driven by our smart program that communicate by CAN.

Today our system had full communication with all management system on the scooter

VMS - Vehicle management system controlled the drive, Regen, reverse and safety features.

BMS - Battery management system full control of every cell with low cell support. CAN communication with the charger, controller and FMS.

FMS - Fleet management system Full report by the internet of all data running on the CAN, full analyze of current consumption and capacity. Our FMS is a both way communication with every scooter.

jonnyfive
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

Hi Braang
Sorry to hear of your spill

We have the same controller. The Sabvocom in mine applies full regen as soon as you come off of cruise and comes in with a bang, so I can imagine if that happened as you were leaning into a bend on a damp road, it may well have caused you to lose grip

Ive looked on the Sabvocom site and it appears that our controller can be programmed in many ways via a pc. Its certainly great in all other ways

Cheers

John

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Re: ERider 8000W scooter - Australia (similar to xm5000li)

Thanks for the support guys!

@pcarlson: Not using PDT programming (nor a Sevcon controller), so while I'm pretty sure the Sabvoton in my bike has a similar degree of configurability, I'd probably have to go about it via different means.

I think that the sweepers duplicated what happens when it first starts to rain: oil seeps up out of the pavement and makes the street *very* slippery for a few minutes, until it gets washed away. In your case it didn't get washed away.

Didn't know that! Thanks for the heads up and the cautionary note!

Part of the problem could be your tires.

Quite possibly! eRider've fitted Vee Rubber tyres to my (and all eRider bikes). I've heard that they're decent rubber - not the best, not the worst. But possibly the best readily available tyres to me. Big name Michelins, Dunlops, Pirellis etc. are near impossible to find here. And even if one does, no way of telling things like i) if they're not fakes ii) how long they've been sitting on the shelf etc.

I'm kind of with pcarlson actually on the regen. The controller disables regen/is unable to recuperate kinetic energy when hot off the charger. And now having gotten used to regen, the bike just feels weird and disconcerting when riding around without regen. As if it's still accelerating, even when I've let off the throttle. I'm sure this is purely physiological though - my brain expects some deceleration when letting off the throttle, but gets none of it.
___

Anyway, I've ordered a bunch of replacement body panels from eRider. A thumbs up to Mountain Chen for turning around the request so quickly and at reasonable rates. Makes a world of difference knowing that one can contact the manufacturer directly for spare/replacement parts at a reasonable cost! Hopefully she'll be as good as new once the new panels go on.

pcarlson1979
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

And now having gotten used to regen, the bike just feels weird and disconcerting when riding around without regen. As if it's still accelerating, even when I've let off the throttle. I'm sure this is purely physiological though - my brain expects some deceleration when letting off the throttle, but gets none of it.

I think this is because we are just used to the HUGE in-efficiencies in the combustion engine, when you let off the throttle, the vehicle will slow down itself because of all the friction in the drivetrain. Electric vehicles just keep rolling, that why regen feels better to me, plus it puts power back into my batteries, win win.

------------------------------
eRider 8000w Scooter - PDT Version
72v 50AH CHL battery
350A Sevcon controller

24km: Delivered - 24 September 2011
2490km: Installed dual 35w HID lights Bi-Xenon Projectors - 27 November 2011
8313km: Installed BMS -

jonnyfive
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

Brang, great news regarding the panels and Mr Chens great customer service. Your scooter looked too nice, shiny and new to have scratches on it.

My Sabvoton doesn't produce any regen either when the pack is freshly charged, but after an amp hour or two has been used, regen comes in full force regardless of where the throttle position is below cruise. It would be nice to be able to program progressive regen.

All said, the regen is really effective and I regularily get up to 17% regen if I concentrate on using it correctly!

I'm hoping to get my scooter off the road for a few days next week and attack this front shake problem

John

jonnyfive
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

Brang, great news regarding the panels and Mr Chens great customer service. Your scooter looked too nice, shiny and new to have scratches on it.

My Sabvoton doesn't produce any regen either when the pack is freshly charged, but after an amp hour or two has been used, regen comes in full force regardless of where the throttle position is below cruise. It would be nice to be able to program progressive regen.

All said, the regen is really effective and I regularily get up to 17% regen if I concentrate on using it correctly!

I'm hoping to get my scooter off the road for a few days next week and attack this front shake problem

John

Johnny J
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

I know this issue have been discussed countless times before, but I am not a big fan of regen.
Especially if it goes on as soon as you let off the throttle, this seems dangerous to me, especially on snowy, icy and otherwise slippery roads.
My regen is activated by the brake levers and I have set it quite low, maybe -1.5kW in a steep downhill and this is perfect for my driving.
Normally I plan my driving and let the throttle go long before I stop, coasting quite long without using any energy, using the brakes only at the very end.
Saying that you gain so and so much by regen is not true, you have already used up that energy using the throttle more than you need.

The way pcarlsons is set, adjustable, would work for me though.

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Re: ERider 8000W scooter - Australia (similar to xm5000li)

Although I have not used it, I am thinking that I would have to set my Regen like Johnny J does.
I have been riding bikes for WAY more then I want to admit.
I am used to coasting with the clutch pulled in. But now I am used to my Diesel truck and how it slows itself down.

I am also simply amazed at you all riding in the Winter months ! There is no way I could do that here in New England USA. Too much sand/salt, ice and snow....... not to mention the freezing cold that I so hate :)

I was wondering if there was a place on this board that would have a "sticky" (stays on the top or a new section ) Where we could have You tube links or Instructions on the "How TO"
Like installing the CA, balancing tires, installing brighter lights or Installing the Lithium Batteries that someone has a you tube on.
That way we could go back and just look up a how to instead of it getting lost in a long thread like this one.

Again, TY all so much for all the info on this bike. Even though I will be getting the Bigger Puma next year, there is such a wealth of information on just this one thread !
:)

pcarlson1979
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

Update: 21/11/2013 @ 12,996.1km

With my regen, it's difficult to describe, but it's like 0-100 is normal acceleration but when coming up to a set of lights to coast (using no power and no regen) is around 10% throttle, and then more you go past that point it gradually gets more and more. The best regen I've seen is around 4.7kw or so coming down a big hill. Plus when coming down from Mt Ainslie in Canberra, it's nearly 3km of full regen and around 2/3 way down I'm under full regen, then BANG!, no regen and the temperature warning light flashes, then BANG regen works again, then BANG it stops etc etc. It doesn't happen to my wife because she's not as heavy as me. But putting in nearly 1.8Ah into the battery warms up the hub motor...a LOT! It's the only hill in Canberra that does it.

Anyway, On my ride home from work today I am bound to break through 13,000km!!

------------------------------
eRider 8000w Scooter - PDT Version
72v 50AH CHL battery
350A Sevcon controller

24km: Delivered - 24 September 2011
2490km: Installed dual 35w HID lights Bi-Xenon Projectors - 27 November 2011
8313km: Installed BMS -

MEroller
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

I'm catching up, I'm catching up :-) Got another 900'ish to 13 000km. Your regen is modeled after the Vectrix VX1 one's, except the throttle grip does not have the Vectrix patented neutral zone in the lower third of throttle travel, so you have to find the "coast spot" manually.
I personally would most prefer proportionally increasing regen analog to the first quarter of (preferentially rear) brake lever travel, and I could put that together with my Kelly, but as my bike is finally running as it should I am NOT touching it anymore except where I need to to ride and charge it :-)

My rides:
2017 Zero S ZF6.5 11kW, erider Thunder 5kW

Johnny J
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

Update: 21/11/2013 @ 12,996.1km

With my regen, it's difficult to describe, but it's like 0-100 is normal acceleration but when coming up to a set of lights to coast (using no power and no regen) is around 10% throttle, and then more you go past that point it gradually gets more and more. The best regen I've seen is around 4.7kw or so coming down a big hill. Plus when coming down from Mt Ainslie in Canberra, it's nearly 3km of full regen and around 2/3 way down I'm under full regen, then BANG!, no regen and the temperature warning light flashes, then BANG regen works again, then BANG it stops etc etc. It doesn't happen to my wife because she's not as heavy as me. But putting in nearly 1.8Ah into the battery warms up the hub motor...a LOT! It's the only hill in Canberra that does it.

Anyway, On my ride home from work today I am bound to break through 13,000km!!

The throttle on my first electric car (built it myself) was exactly like that and I liked it alot, you almost didn't have to use the normal brakes at all!
But the "neutral" spot has to be easy to find.
I wonder if I could program my Sevcon to make it work like yours or if is the PlugIn software that handles this?

pcarlson1979
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

Update: 22 November 2013 @ 13,009km

I passed 13,000km on my way home last night! Battery still great! No sign of degradation of these CHL cells yet. I had to do a long trip last week after work and did 74.8km and consumed 42.5Ah and I still got home. This is with 12,904km on the odo.

13000km.JPG
Long trip at 12904km.JPG

------------------------------
eRider 8000w Scooter - PDT Version
72v 50AH CHL battery
350A Sevcon controller

24km: Delivered - 24 September 2011
2490km: Installed dual 35w HID lights Bi-Xenon Projectors - 27 November 2011
8313km: Installed BMS -

jonnyfive
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

Well done Phil, great milestone passed. Bodes well for my next 12 months!!
I've only just hit 1,000kms, but must say the batteries are brilliant. Longest run I've done is 67kms but that was before the CA was installed, so can't comment on how many ah were consumed, but there was no degradation in power, still pulling like a mule near the end :-)

The 72v and 8kw setup is just right in my opinion (for my needs of course, might not suit everyone), plenty of power and capacity for the size of the bike

jonnyfive
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Re: ERider 8000W scooter - Australia (similar to xm5000li)

Well done Phil, great milestone passed. Bodes well for my next 12 months!!
I've only just hit 1,000kms, but must say the batteries are brilliant. Longest run I've done is 67kms but that was before the CA was installed, so can't comment on how many ah were consumed, but there was no degradation in power, still pulling like a mule near the end :-)

The 72v and 8kw setup is just right in my opinion (for my needs of course, might not suit everyone), plenty of power and capacity for the size of the bike

branng
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Battery heating ideas

So it's winter proper here now in Beijing, and even the almighty CHL battery cells are starting to feel the bitter chill of winter. I've seen the battery pack voltage dip down as low as 68V (albeit, after a good 40km of riding & leaving the bike out in -5 degree weather for an hour or three). I'd very much prefer keeping things above 70V, as much as possible. So am thinking about building an MERoller-inspired battery heating system...

I'm thinking of wiring things up directly to the battery pack; anyone see any pitfalls in wiring things up to the battery? I thought doing so (rather than running off the 12V circuit) gives an additional layer of idiot-proofing; I can imagine one day forgetting to switch off the heating circuit, turning on the bike, firing up the HIDs and hearing a "pop" sound. And I was also wondering if anyone had any suggestions on how I could control/regulate the temperature at a particular set point? I've looked around and have found plenty of 12V DC / 220V AC temperature controllers/sensors, but (obviously) none for a 72V system. Any ideas?

Thanks!

MEroller
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Re: Battery heating ideas

I would strongly propose to work with 12V for the heating, with a bespoke DC/DC-converter, separate from the other electrical systems. Power the converter from the battery, including the main circuit breaker, just in case...
Another important point: It is NOT worthwhile to keep the battery at a set temperature, not even over night! That needs 30 to 50% more electrical energy than letting the battery cool down a bit before starting to heat full blast, to have it ready at the desired temp. just as you are ready to take off.
If you still had a means of automatic temperature control that would greatly simplify your heating processes, as you could set a 12V timer (are there such contraptions in China?) to a certain time, like 2 a.m., and no matter what the ambient temp. you could let it run till you leave, and the temp. control would ensure the times for keeping the battery at the goal temp. are as short as possible.

Make sure you put the heating BELOW the battery, on the floor of the battery box. Prismatic cells have a far higher rate of thermal conductivity bottom up than lateral. I did it the wrong way :-(

Heating mats such as for aquariums can be a good starting point! And you will need a lot of insulation between battery box floor and heating mats to ensure the heat goes up into the cells and not down into the box and ambient air, and maybe some more insulation around the sides. And a piece of Alumin(i)um sheet metal should go between heating mats and cells to ensure good even heat transfer and to keep the mats out of mechanical harm's way. Another VisforVoltage member working in China has already put in such a heating system in his eRider Thunder, I just do not remember his user name...

My rides:
2017 Zero S ZF6.5 11kW, erider Thunder 5kW

branng
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Re: Battery heating ideas

@MEroller: Thanks for the suggestions!

The battery heating solution is only for when I'm out and about, usually for meetings, lunches, dinners, events etc., all of which tend to be completely unpredictable in duration. Difficult to set a timer if I don't know when I'm going to next hop on my bike to my next destination. Thinking about it, if I do so, I might end up with a battery that's either too cold, too hot or - if I time it just right - uh... just right. I don't have such problems for my actual, regular commute, as I keep and charge my bike in a heated, indoor area overnight.

As per MEroller's advice, I'm going to go down the 12V route, mainly as thermostats/timers for 72V circuits are impossible to find (almost everything out there is designed to run off 220V AC, obviously). I've managed to find 0.3ohm per meter heating wire (can't find anything lower, and next resistance up is 4.8ohm/m) and a 120W 12V blanket heater thermostat. The battery box is 690mm long by 190mm wide, so I'm figuring to get good "coverage", I'd need at least 7m of wire. If I ran 7m of heating wire straight through the 12V circuit, I'd get at best, a paltry 69W (12V * 12V / (7m x 0.3 ohm per m) of heat. Not sure that'll be sufficient to keep things in the battery box at 20 deg C when it's -20 outside.

So I'm thinking of running two heating wires in parallel, 8m each (2.4 ohm each). Which gives me a circuit resistance of 1.2 ohm and 120W of heating. Of course, it now means I'll have 16m (i.e. a LOT) of heating wire running back and forth inside the battery box. Seems to me like an overly complicated solution... Anyone have any better suggestions?

Cheers all!

jonnyfive
Offline
Last seen: 7 years 7 months ago
Joined: Thursday, September 5, 2013 - 17:21
Points: 43
Re: ERider 8000W scooter - Australia (similar to xm5000li)

Hi everyone

I have lots of good news to share

I final got some shed time to have a good look at the shake I've been experiencing and which has got progressively worse.
I thought I would do a little more diagnosis of the symptoms, as I noticed that when leaving home first thing in the morning, the shake was less pronounced and after a few kms, when the tyres had warmed up, it got worse. Lately we have been having 35 degree days and when going home late afternoon, it would shake horribly. yesterday when I got home, I put the bike on the stand and watched the rear wheel spinning up, you could see it was badly out of round and started shaking the whole bike. When I tried it first thing this morning, much less of a shake.
I also tried the front tyre as much as I could, but it didn't appear so bad.
I took off the wheels and went to my friendly local tyre man, who fitted a new pair of top end Michelin rubber. I put the wheels back on this afternoon and went for a test run, no more shakes or vibration at all and the ride is much softer and more positive. I can't tell you how different the bike is and how happy I am.
I really thought it was the front end playing up, but the problem came from the back, but my rear detector wasn't working so well!!
While I had some panels off (I don't have the PDT, so had to undo all the wires) I connected up the CA to the Hall sensor and that works fine, but I will have to do the capacitor mod as the numbers flicker around a bit at higher speeds. Thanks for the tips Phil.
I took a picture of the massive 20amp charger that BRAANG and I have and also the Sabvoton 150 amp controller, very neat and effective controller.
When I took the rear wheel off, I also found a small nail in the tyre, so it was fortuitous that I had to change the tyre anyway.
I'm still going to check over the forks and see how much oil is there, but all in all the bikes handling is very acceptable now

I hope you guys with different wobbles, find the cause, it does spoil what is a nice little bike in most other ways

Cheers

John

20131130_155840.jpg
New rubber!!
20131130_134354.jpg
Huge 20 amp charger
-20131130_134405.jpg
Sabvoton controller

Johnny J
Johnny J's picture
Offline
Last seen: 1 year 1 month ago
Joined: Tuesday, July 8, 2008 - 17:02
Points: 377
Re: ERider 8000W scooter - Australia (similar to xm5000li)

I exchanged my tires for german Metzelers a year ago and my bike almost has no vibrations at all from the rear wheel at full rpm on the stand.
But still I got "the shakes" at certain speeds, not very severe, but still irritating.
As you I am not certain if it comes from the front or rear...

pcarlson1979
pcarlson1979's picture
Offline
Last seen: 1 year 1 month ago
Joined: Sunday, February 20, 2011 - 16:18
Points: 465
Re: ERider 8000W scooter - Australia (similar to xm5000li)

*DROOOL*

I love the look of that beastly 20A charger. Alas it will never fit in my bike. So glad you got the shake sorted out. I must be lucky and never experienced it?

------------------------------
eRider 8000w Scooter - PDT Version
72v 50AH CHL battery
350A Sevcon controller

24km: Delivered - 24 September 2011
2490km: Installed dual 35w HID lights Bi-Xenon Projectors - 27 November 2011
8313km: Installed BMS -

jonnyfive
Offline
Last seen: 7 years 7 months ago
Joined: Thursday, September 5, 2013 - 17:21
Points: 43
Re: ERider 8000W scooter - Australia (similar to xm5000li)

Hi Phil, yeh, probably just the luck of the draw. I can't remember who it was, but one member said they put the wheels into channels and blow the tyres up to hold them tight. I can imagine that would cause malformation of the tyre, which might not recover in all cases.

For the small cost involved ($110 for both tyres fitted and front balanced) I'm happy to have top class rubber on the road
I'm hoping I'll be just plug and play now as everything else seem to be fine.

I must do the HID mod before the winter nights return though

Cheers

John

M.Chen
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Last seen: 5 years 7 months ago
Joined: Thursday, July 19, 2012 - 08:51
Points: 93
Re: ERider 8000W scooter - Australia (similar to xm5000li)

Coming soon........New revolution FOC controller........150A battery current bring out 500A phase current....and amazing torque.

It is 48 MOSFET and better than 24 MOSFET Sevcon 80350 ...

It will come to bulk production in 2014 !

motor.jpg

phase current.jpg

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