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Accident Report 9b1 e+


fluidfred
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3 hours ago, fluidfred said:

I had an accidient by a power cut off.

Drove  at max speed when the 9b1 E+ as pulled the pedal back, I moved back and when leaning forward again then  suddenly lost power.

Result: Lots of  excoriations of the reight half side of my body. Mainly landed on the right hip causing a serious

laceration which had to be stiched in hospital. Later clottted blut had to be taken out by an operation. 4 days in hospital.

Really dont trust the device any more.

Just recently my nabour  had a similar expierence with another 9b1 e+ from a friend, however lower speed and injury not as serious.

Date of purchase: May 21, 2017
Model Ninebot One E+
Firmware version, can be provide when I am out the hospital
Milage total 150km
Speed approx. 22km
Use of app (yes or no) no
weather conditions, good and sunny
road conditions, try tar road
battery charge  90%
wear and tear, 

Four days in the hospital?  Wow, what a terrible result.  Sorry to hear you got hurt so bad.

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1 hour ago, MaxLinux said:

I am surprised by this recent purchase date because I thought Ninebot stopped making the One E+.

According to electricunicycleonline's website, they stopped production and are out of stock, they recommend IPS.  There must still be some available on Ebay and other places.  Speedyfeet still shows them in stock.  

Ninebot ONE E+ (Gen2) Electric Unicycle

Regular price£579.17 | £695.00 including VAT

 

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That's very strange to hear about a new wheel cutting out like that. How much do you weigh?  Were you alarmed by the tiltback and tried to brake really hard?  I usually charge to 100% and zoom up to near or at tiltback speed where I back off a little to resume normal pedal orientation.  I don't try to brake really hard unless I have to as that can stress the wheel's electronics.

What protective gear were you wearing?  Were you riding aggressively?  Quick leans?  Was it an older wheel bought second hand in May?

Edited by Hunka Hunka Burning Love
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I don't know if NineBot can pair with WheelLog but I strongly suggest doing so then riding while observing the wattage usage. You might be surprised at where the wattage usage approaches dangerously high levels.

For me:

--Going downhill uses the most energy.

--Braking while going downhill is really quite dangerous.

--U-shaped cement sidewalks, where you go up and down, up and down, have huge spikes of wattage. I would never have guessed.

--The initial acceleration from a dead stop can be large and highly variable depending on just a little bit of difference in leaning.

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34 minutes ago, LanghamP said:

--Going downhill uses the most energy.

 

10 hours ago, Keith said:

My conclusion was that it was the result of trying to brake with a nearly full battery, it was the start of a very long ride, ( that I still completed ) so I'd put every watthour of energy I could in the battery but I had already ridden 1/2 mile or so.

  This confuses me. I've seen multiple posts where riders have used WheelLog and seen huge power consumption on downhill braking and then other posts where regerative braking on downhill is discussed. Which is it... Or is it both?

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11 hours ago, fluidfred said:

I had an accidient by a power cut off.

 Very sorry to hear of this accident. Glad you are on the mend. I think I will run Wheellog or Darknessbot at all times on my wheel so if it fails I'll have some closure as to why.

4 hours ago, MaxLinux said:

I am surprised by this recent purchase date because I thought Ninebot stopped making the One E+.

There is a brand new sealed C+ on eBay right now so I guess new units are around. That one is from Fl. If it has been stored in a Fl garage for the last year I imagine the battery would be badly worn through the temperature. Maybe something similar for fluidfred.

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6 minutes ago, SuperSport said:

It's both.  Braking is accomplished when regenerative braking is applied.  It causes a LOT of energy to pass across the board, not out, but in.  Can still cause cutouts if the power is too great, or if your battery is too full.

 So Wheellog is not differentiating between current direction? I also thought regerative braking didn't return much to the battery. These reported values sound substantial. Clearly I need to read up on it.

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I believe there is one app that shows when it's going in instead of out, but I don't remember which one.

There is a great amount of power going in during braking, but the battery can only take so much of it safely at one time, so the extra is bled off as braking and heat.

Edited by SuperSport
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15 minutes ago, SuperSport said:

Here is an example of my MSuper when going down and then back up my driveway.  You can see it creates more going down.  And yes, my driveway is VERY steep.

2hdz40n.jpg

Isn't this close to, or exceeding, the wattage of the MSuper? Is not the downhill close to a cutout or something bad?

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3 hours ago, SuperSport said:

Here is an example of my MSuper when going down and then back up my driveway.  You can see it creates more going down.  And yes, my driveway is VERY steep.

2hdz40n.jpg

 Wow. That is a huge amount of power in. Quote scary actually. After seeing this I'll be treating breaking and downhill runs with some serious respect.

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3 hours ago, LanghamP said:

Isn't this close to, or exceeding, the wattage of the MSuper? Is not the downhill close to a cutout or something bad?

 So I'm getting a V8. Total battery power 1440Watts I think. If I experienced this level of charge from regenerative breaking I'd have cut out? I'm guessing that even of the battery isn't full the charging circuit will shut off if excess current goes in. Over 1C for example.

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5 hours ago, LanghamP said:

For me:

--Going downhill uses the most energy.

@SuperSport, my reply was actually in response to LanghamP's statement.  I should have quoted it earlier.  When I said "you might not realize from the graph" I was referring to LP, not you, seeing your graph and realizing the power readings are absolute values.   :innocent1:  

Edited by Hunka Hunka Burning Love
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