Electric scooters and bikes. Anyone have 1 and what's your thoughts on them? - Page 1
Forum section: electronics / general

author: Terry01
author_rank: Frequent Contributor
timestamp: January 14, 2019, 01:06:55 pm
content: I got a new electric scooter a week or so ago. One of the kick scooter type, not motorbike scooter type.It has a 60v 21Ah lithium battery and has 2x 1000w motors. You can either select power from just the rear motor on it's own which gives you 1000w pulling power or both front and rear motors powered which gives you 2000w pulling power.It has 3 optional speeds and also either "eco" or "turbo" power settings.Obviously it doesn't have a "turbo" but I guess the difference between "eco" and "turbo" is a sort of half power or full power at the top end of things. If you have "eco" selected it sort of slows up and is much less torquey as it reaches towards full speed where as with "turbo" selected it will still wheelspin and pull like crazy even if your going quite quick and nearing top speed and give it more throttle.It really is very surprising how much power this little thing can get down! I haven't done any kind of measured tests with it yet but just what I can guess from a few times riding this little thing it's amazing how much power it has and how long it keeps going with no real lag even after you've been roasting it for a while. I expected it to start slowing up after a while but it was just as quick and responsive even after being ridden full throttle for a while and hauling my backside uphill for a few good stretches too.I've downloaded a decent GPS app so will get some proper measured tests in soon and post the results.I've seen a few videos of the electric mountain bike types too and they really look impressive as far as power down and distance covered. I would be interested to hear from anyone who has one and what your thoughts are on this type of machine.

author: nctnico
author_rank: Super Contributor
timestamp: January 14, 2019, 01:10:16 pm
content: I have been contemplating getting one but from what I've heard cold isn't good for the batteries and it can wreck them quickly (*). In some models you can take the pack out and store/charge it inside. Finding a scooter with a high quality battery pack which lasts long can be a problem though. What kind of pack does it have? Make sure the pack is made in Europe and don't store it for a long time without charge.I'm also wondering how the ride is with a heavy motor in the front wheel. This has to be very hard on the spokes.* I also wouldn't be using it very often which is also not good for the batteries.

author: NiHaoMike
author_rank: Super Contributor
timestamp: January 14, 2019, 01:51:32 pm
content: Rinoa Super-Genius has done a lot on DIY ebikes.https://www.youtube.com/playlist?list=PLyjfBfFp2v2o_zug1bsCYm0C476x8Y58n

author: David Hess
author_rank: Super Contributor
timestamp: January 14, 2019, 09:14:28 pm
content: It is not so much the power of the electronic scooter or bike as much as how little power a person in even good shape can produce on a continuous basis. So even 1/4 horsepower is a huge difference.

author: thm_w
author_rank: Super Contributor
timestamp: January 14, 2019, 09:48:58 pm
content: 2000W for a light kick scooter is ridiculously powerful, a 1,200 Whr battery is also very large for that type of product. What is the model?Its the most efficient means of powered personal transport, but the issue you can run into is local laws. For example, that scooter would not be allowed to be ridden here at all for numerous reasons (motor too powerful, speed is likely too fast, limit here is 35km/h, and powered push scooter is not allowed at all). You can probably get away with it, but you risk a $350 fine.To get ~20km to work takes me less than 700Whr (thats from the wall), or ~9c of electricity. Electric car is closer to $1 for the same distance.If you are worried about cold performance, either over-spec the batteries for the distance you need to travel, or look at LiFePO4.

author: David Hess
author_rank: Super Contributor
timestamp: January 14, 2019, 09:54:01 pm
content: Where I am the local governments simply required the scooters to be licensed by the state knowing that the state would not license the scooters because they were not large enough and did not have engines. That neatly solved the problem of making the scooters illegal while preventing standing to challenge the laws.Most states did the same thing with electric vehicles and then later biofuels to keep electric vehicles off of the roads and prevent people from using biofuels. In the past, one of my friends in California was literally told he could not register his electric vehicle because it could not be smog tested. Of course he could apply for an exception which the state may or may not grant and of course the DMV may or may not honor.

author: nctnico
author_rank: Super Contributor
timestamp: January 14, 2019, 09:59:40 pm
content: Quote from: thm_w on January 14, 2019, 09:48:58 pmIt is not so much about the performance. Your scooter likely has a Li-ion battery pack. Li-ion in general shouldn't be charged at temperatures below 0 deg. C.

author: Terry01
author_rank: Frequent Contributor
timestamp: January 14, 2019, 10:42:55 pm
content: Quote from: thm_w on January 14, 2019, 09:48:58 pmIt's a Viper Dual 2000w. Like this...

author: thm_w
author_rank: Super Contributor
timestamp: January 14, 2019, 10:47:13 pm
content: Quote from: nctnico on January 14, 2019, 09:59:40 pmGood point, probably best to bring inside to charge then. Ideally a good BMS would have a temperature sensor inside that would show the reading or prevent charging at low temps then.It was a usedLiFePO4I bought for next to nothing.https://batteryuniversity.com/learn/article/charging_at_high_and_low_temperatureshttps://relionbattery.com/blog/lithium-battery-cold-weatherhttps://upcommons.upc.edu/bitstream/handle/2099.1/26410/David_Balaguer.pdf?sequence=1Quote from: Terry01 on January 14, 2019, 10:42:55 pm70km/h+ wild..

author: nctnico
author_rank: Super Contributor
timestamp: January 14, 2019, 10:51:10 pm
content: Quote from: Terry01 on January 14, 2019, 10:42:55 pmBack in the old days you had speaker sets the size of a small (1 litre) box rated at 2000W PMPO. Looking at the pictures it seems the PMPO power rating hasn't died. I hate to say it but this has 'cheap Chinese toy crap' written all over it. The construction is just scary especially because it can do 70kmh. It wouldn't surprise me if this scooter snaps in half if you drive over a small bump.

author: Terry01
author_rank: Frequent Contributor
timestamp: January 14, 2019, 10:52:15 pm
content: I haven't had it up to 70kph yet as I've only been out a few sort runs. I saw in 1 You Tube video where the guy has it up on blocks it reaching 93kph and I have no doubt it'll blast past 70kph no sweat at all. I don't know if it'll do the 90kph when it's loaded up with me but I will certainly give it a try. I'm only 11 or 12 stone so not a heavy load as such. I know where there is a nice tar path that's a cycle path and it's quite straight so you can see well ahead for walkers or cycles so perfect for "giving it the beans".It seems to be accepted where I live so long as your not flying about endangering people and using it at safe speeds similar to riding a pedal bike and not getting in the way of traffic or things like that.I'll try and post a video...

author: TopLoser
author_rank: Unknown
timestamp: January 14, 2019, 10:54:28 pm
content: Are they street legal in the UK? If they are what insurance and/or road tax is obligatory?

author: Terry01
author_rank: Frequent Contributor
timestamp: January 15, 2019, 08:26:42 am
content: No, they are not street legal in the UK. They are only "supposed" to be ridden on private land. PERIOD!As far as I can make out from others in the UK who have had them for a while, so long as you are riding responsibly while around people or traffic the police won't bother you. If you are flying past a school at 30 mph on the pavement you are for sure going to be stopped and have it taken from you. Rightly so I believe.The law around them in the UK was set in 1835 or there about so way out of date. I remember years ago when I had the petrol version called a "GO PED" they made it that it had to be insured and taxed for it to be legal. No one would insure you so it disappeared up it's own backside real quick.I think with these models because they are big on "green" modes of travel they are more prone to turn a bling eye so long as you are riding responsibly around people or whatever and not causing a problem for traffic.Lots of other countries have made certain laws regarding them and from what I can make out the "green" campaigners here in the UK seem to think the law will be updated in the next year or so.I live in Edinburgh and have seen police when I've been out, granted not a lot up till now but the ones I have seen have had a look and drove on. I hear from others who live all over the UK it's much the same everywhere.

author: Terry01
author_rank: Frequent Contributor
timestamp: January 15, 2019, 08:28:21 am
content: …. I also use a helmet and pads and stuff and lights when needed too. I dunno if that may make a small difference too...

author: Domagoj T
author_rank: Frequent Contributor
timestamp: January 15, 2019, 10:37:30 am
content: 2kW on a scooter? That's insane.Over here in Croatia, electric motor assisted bicycles are required to stay below 250W. And that's a bike where you have large wheels, good posture and can have proper disk brakes installed. Even with that those thing easily maintain the electonically limited 25km/h (you can ride faster, but only on your own power) with minimal manual input.I don't have one, since I don't feel like hauling it every day up and down the stairs to the basement, but have had a couple of chances to test them. With some manual input, 250W is plenty to cruize at 20km/h for quite a while.2kW on scooter is a death trap. Be careful with the front motor.

author: EmmanuelFaure
author_rank: Regular Contributor
timestamp: January 15, 2019, 12:28:01 pm
content: My thoughts :- Cost of transportation divided by ~10 compared to a car. New car >= ~30€/100km when you take into account everything : Fuel, insurance, maintenance, parking fees, depreciation expense.- The battery life span can be increased A LOT by limiting the depth of charge and the top charge voltage. Look at :https://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries

author: Terry01
author_rank: Frequent Contributor
timestamp: January 15, 2019, 01:01:23 pm
content: Quote from: nctnico on January 14, 2019, 10:51:10 pmHave a closer look.It's far from "Chinese toy crap". You can get the cheap crap machines for a couple hundred quid but this is not that I can assure you. I paid just shy of £1000 for it because it does look fairly well made and now I have had it out I can vouch it's robust as hell. Like you say if your gonna park your farter on it at 70kph it needs to hold out. I could have bought it's equivalent made from cheap crap for £200-£300 or there about but didn't for that reason.The petrol "GO PED" I had years ago did break in half and that was solid enough built too to be fair.My friend tried to jump a kerb going flat out and jumped too early, the frame landed on the round of the kerb rather than right up over it and the thing broke right in 2!My friend and the handle bars and front wheel made the jump and went skidding about 30 yards along the pavement while the board and the back wheel stopped dead. Funny as hell! It pulled his trousers down too as he skidded along the pavement and lost some skin and clothes material!Real funny but just goes to show how easy it is to get hurt. I'm sure he still has scars from that crash 20 odd years later!If you go fast on anything there is always a risk of some kind. I've always found the crashing to be the easy part.... it's the landing that's a "mofu"!

author: BillB
author_rank: Unknown
timestamp: January 15, 2019, 01:28:41 pm
content: Quote from: Terry01 on January 14, 2019, 10:52:15 pmOMG. I'm an avid motorcyclist, ride a fast sportbike, but still not crazy enough to try 93kph on that thing. Those tiny little wheels, lack of any steering angle, and practically shopping-cart wheel caster on that front end...

author: nctnico
author_rank: Super Contributor
timestamp: January 15, 2019, 02:00:07 pm
content: Quote from: Terry01 on January 15, 2019, 01:01:23 pmNow I'm even more afraid! Look at how bad it is put together. This will fail when used regulary (the rivets to join the front steering column to the base plate for example). Probably not as quickly as the cheaper ones but this thing just isn't road worthy.

author: cdev
author_rank: Super Contributor
timestamp: January 15, 2019, 02:24:37 pm
content: Does anybody have any ideas of what kind of motor would be optimal retrofitted to an old, all steel Raleigh Grand Prix (in mint condition) with aftermarket Shimano dérailleur etc. so motor would likely work the best on the front wheel. It's a 27 inch bike, however! Not so many left on the road.I would really like to have both the electric capability and the real bike, with all its gears, strength, (carrying capacity, because i'd like to be able to do most of our shopping using my bike as I used to) I'm a big guy too. Ideally the batteries could be detached and brought inside and bike left outside in the garage in cold weather too. At one point I was looking at a Golden Rotor kit but never pulled the trigger on it.

author: nctnico
author_rank: Super Contributor
timestamp: January 15, 2019, 02:29:14 pm
content: The best place for the motor is on the frame and then the rear wheel. Definitely not the front wheel. Also adding a motor will add drag to a bycicle when it is used without powering the motor. How much depends on the type of motor.

author: cdev
author_rank: Super Contributor
timestamp: January 15, 2019, 02:32:33 pm
content: A larger electric scooter (the size of a conventional road-legal gas scooter) would likely be great for me, as I've ridden lots of scooters and even owned one once, but I would want a more conventional, Vespa-like design. Those tiny wheels and vertical riding position worry me too combined with all that power. I suppose that would come in use for riding long distances on flat city streets? Not ones with potholes, though.Seems like it might be okay for a very flat place. Is it street legal?

author: vealmike
author_rank: Regular Contributor
timestamp: January 15, 2019, 02:49:41 pm
content: Front wheel motors are 250W.I converted the wife's old steel frame mountain bike to electric last year. Fitted a Yose Power 350W kit and built a spot welder and 36V 8.8Ah battery pack.The conversion was an utter pain. The frame wasn't wide enough for the new wheel. The bike had six gears, but the new wheel would only take 7, so the rear dérailleur shifter had to be swapped out as well. The battery pack would physically fit inside the frame, but it was impossible to assemble it, so I had to buy a rack and bolt it on there. The cadence sensor fouled the pedals and had to be "adjusted". And the throttle fouled the brake/ gear shift.But other than having to tweak nearly everything (bastard file and hammer) the kit just worked.My wife was horrified at the idea of an electric bike. She felt that it was something old ladies used. But having (eventually) tried it, she absolutely loved it. In 16 years of knowing her, she'd used her bike twice. Add electric power and she used it for commuting every day through the summer and autumn.It is a lot of fun. Add a bit of leg power and it accelerates like crazy. With no input from me, it will climb and accelerate on a gentle incline. But it will not do a steep hill without rider assistance.

author: cdev
author_rank: Super Contributor
timestamp: January 15, 2019, 02:49:59 pm
content: The one I was looking at came fairly highly recommended by a friend, but it was years ago, and I'm sure that new options probably exist now. It was a hub motor that I am pretty sure used induction and fancy controller to deliver the power. I am pretty sure the rolling resistance was very low. At the time, around ten years ago, it was recommended by a friend who is an expert professional bike mechanic. I think it was a "goldenmotor" hub. That way I could avoid having to buy a whole new bike. So it would be a better motor and battery for the money.Quote from: nctnico on January 15, 2019, 02:29:14 pm

author: Terry01
author_rank: Frequent Contributor
timestamp: January 15, 2019, 03:32:12 pm
content: Quote from: nctnico on January 15, 2019, 02:00:07 pmLOL.... there are no rivets on it at all. Those are hex bolts. It's all metal too, that aircraft type metal. I don't know exactly what it is called but like a heavy duty alloy? Everything locks in to the frame too when you unfold it out so quite robust.The guy who owns the one in the link I have posted has ridden his regularly for over a year now. 7 or 8 miles each way to work and back, so around a 15 miles round trip. His is still as new, not loose or wabbly or anything. The motors are both hub motors so no real maintenance as such compared to belt or chain driven which are supposed to be a bit of a pain. Another reason I opted for this particular model...The new 2019 model of this same scooter gets 3600w of power down, 1800w per wheel! The suspension and stuff is upgraded a bit for that. Air suspension and hydraulic brakes and stuff. I think it's a bit beefier all over and around too.Now you better sit down for this... the 2019 sports model gets 5400w of power down! Even I would be a bit wary of jumping on that thing! That must really shift! Mine will wheel spin both ends if your too heavy on the throttle so how they keep 5400w under control is a bit beyond me.

author: MT
author_rank: Super Contributor
timestamp: January 15, 2019, 04:27:52 pm
content: I like the Viper blade with somewhat less nobby wheels but that has no centrum hub motors.https://viperscooters.com/product/viper-blade-2000w-60v-electric-scooter-black/Quote from: cdev on January 15, 2019, 02:24:37 pmBig? like this?

author: Terry01
author_rank: Frequent Contributor
timestamp: January 15, 2019, 05:13:08 pm
content: Now that's funny! Almost too funny!The "Blade" is chain driven and from what I can make out from others the chain stretches after a few miles each time you adjust it. Most of the chain driven ones have to have a chunkier chain fitted if you plan on anything but flat road, i'm sure it's called a "hill pack" or something like that. I don't own one so that's only what I have heard from others so I don't know how much of a pain it really is even if at all.I'm just in from a quick run on mine and got it to 68kph but it'll go more if i have more road and better clothing on, it was getting dark too. I would guess it'll run out of steam in the 80's kph somewhere. It'll for sure blast past 70kph!

author: Kilrah
author_rank: Unknown
timestamp: January 15, 2019, 06:30:35 pm
content: Quote from: Terry01 on January 15, 2019, 03:32:12 pmThey don't. In typical Chinese manner they just make the number increasingly bigger cause bigger is better and sells more, that's it. Couldn't care less about how manageable or safe it is.Here electric kick scooters are allowed up to 500W/20km/h on roads and cycling paths when present, although policemen often don't know and are all happy to tell you it's forbidden, until I take my phone out with the relevant page of the police website, then it's me showing a big grinHad one the other day and he was despicably trying to "but..." and find any other way to tell us (2 of us users happened to pass by and get stopped at the same time) of something we couldn't do, was funny...Have an etwow s2 booster that i've done nearly 2000km on since I bought it 2 years ago. Really convenient and light, can easily carry it in public transport.I'm cheating a bit though, stock battery is 9s/6.5Ah and I added a 4s/6.5Ah in series for a bit more torque/power since I often do steep climbs and it makes a world of difference. Gains some top speed as well as a result to about 38km/h. I'm happy with that, wouldn't need or want more, especially since it wouldn't be that slim or weigh just 11kg anymore.

author: Kilrah
author_rank: Unknown
timestamp: January 15, 2019, 06:42:58 pm
content: Ah and my battery after those 2 years and 2000km is still in good shape, maybe a bit more voltage sag under load when it gets at low state of charge but not a concern yet.

author: metrologist
author_rank: Super Contributor
timestamp: January 15, 2019, 06:46:29 pm
content: Quote from: Terry01 on January 15, 2019, 08:28:21 amA friend had a couple of the Swiss(?) versions of these, really fast scooters. Yeah he had to stop quick and they will stop quick, but you won't...so make sure you have good wrist guards because wearing your hand at the elbow is no fun...I bought an electric bike wheel off ebay for $120US and another five battery packs for $150, so $170 allowed me to convert my old mountain bike to electric. I put on narrow road tires and it will go about 24MPH and 5 miles range on one pack (~180WHr). I charge with a 100W solar panel and Li-Ion solar charge controller. I have about 500 miles on the system by now and it works fantabulously.

author: MT
author_rank: Super Contributor
timestamp: January 16, 2019, 01:32:02 am
content: I can see more and more bank robbers, thieves snatching purses in parks etc using fast scooters as getaway vehicles.

author: Fred27
author_rank: Unknown
timestamp: January 16, 2019, 09:29:19 am
content: Not quite the same thing, but I've had an electric motorbike (Zero FXS) for over a year. I still absolutely love it. When I bought it I thought I'd probably get another petrol bike to go alongside it at some point. Now I'm not so sure.

author: ealex
author_rank: Frequent Contributor
timestamp: January 16, 2019, 07:28:20 pm
content: i have an "inokim light" - light as in 14kg, got it to 1300km in ~3 months, 24km from home to office and back.it's advertised as 350W, only rear wheel drive - but that's enough to make it skid if you're not careful.10S2P battery, 4400mAh made from 18650 cells -> easy to rebuild with better or more cellsalso, it's software limited to 25km/h - the legal limit around here (you can override it in a config menu)what i like about it:- decent range- folds to a decent size - i can put it under a desk in the office and charge it- built like a brick - you can shave at least 3-4kg- wider than other models - i can keep my feet inside it's perimeter- some empty space in the frame - i can add at least 2 extra cells or maybe switch to another controller ( i was reading about VESC)what i don't like:- 8" wheels make it unstable : this city has zero dedicated bike lanes (maybe the next 7+ earthquake will fix this ...), and usually the first lane is the one with the most potholes / manholes / wavy asphalt, etc -> you need to be extra careful or use the sidewalks as much as possible- this version has some design issues: the manufacturer tried adding a drum brake on the front wheel and unbalanced the weight distribution on the bearings -> one of the bearings gets "twisted" and deforms the axle, witch is made from some softer stainless steel- some strange regenerative braking with a stupid implementation: if you disable it to gain some coasting distance you loose the lights .... and it's always enabled, even when you don't touch the brake- poor service / support "15 working days" for a part they had on stock, the entire operation took me 15 minutes to understand what i need to do and replace it- poor quality control: one nut was loose, rattling inside the frame, one of the kickstand screws came undone, making it swing under the frame and making the entire thing jump- no "health" related info, as the motor controller has just the power leads to the battery -> i can't see in advance when a cell gets weak to start planning a repair / replacement or to check pack balance

author: Red Squirrel
author_rank: Super Contributor
timestamp: January 16, 2019, 08:18:09 pm
content: Crossed my mind to convert a regular bike into one, would make a neat project. The government likes to get their hands into everything, and they already do have their hands in these though. There are regulations such as max wattage etc so something to keep in mind.

author: Terry01
author_rank: Frequent Contributor
timestamp: January 16, 2019, 08:20:31 pm
content: Quote from: Fred27 on January 16, 2019, 09:29:19 amI've seen a couple reviews on that model and it seems everyone who has tried it loves it! It looks nice too I think.

author: Zbig
author_rank: Frequent Contributor
timestamp: January 17, 2019, 01:46:09 pm
content: I have Xiaomi Mijia M365 and I like it.

author: aargee
author_rank: Frequent Contributor
timestamp: January 18, 2019, 02:35:00 am
content: A year ago, I converted my old 26" mountain bike to electric with a rear hub drive, with a number of connector mods to the supplied controller (XT series power connectors for power and motor drive).I have a limited source of healthy second hand 18650 batteries and I've made two 13S (48V), 9AH batteries for it using Hailong cases from China with their own BMS circuits.I enjoy going out at night and cycling/motoring away around the back streets... the bike would still be sitting there with flat tyres if I hadn't done this little project.The battery(s) are charged using a single domestic solar panel (35V @ 9A) through a cheap ebay sourced boost power supply limited at 2A output.So I'm running a 'green' charge setup.