feefee23

feefee23 submitted a new listing: [plain]Frog 62 eBike - 36v 250W motor & 8.8Ah battery - 24” Wheels[/plain] - [plain]Frog 62 eBike - 36v 250W motor & 8.8Ah battery - 24” Wheels[/plain] Learn more about this listing...

Thanks for tip, i checked out and this seems to be the most relevant. It's based on the Sony/Matura VTC6 cells, are they top notch? Price of €400 including a charger...what do you think? I did see the eBay link you also gave but it was without charger and the german guys look a bit more substantial an operation! Help welcome as always! https://enerprof.de/en/ebike-batteries/bike-frame-batteries/48v-13s-batteries/379/hailong-plus-30a-bms-frame-battery-li-ion-48v-12ah-vtc6?c=71

Hey [mention=9614]Nealh[/mention] just picking back on this after a break. I’m keen for a 48v lion pack, around 10-15aH which would serve the kart and next eBike too. I’ll get a controller with max peak current of 20A, so I was wondering where you’d recommend I look for a battery to go with that? You mentioned I might need a higher battery budget which is ok. Thanks so much for help.

Ahhh gotcha, I can see in the image of the controller what you are saying now! okay, I don’t know much about brushless motors and their controllers, do you think I will be able to connect a lower rating controller to this same motor and achieve what I need? I presume I just need to find a controller limited appropriately, which supports PAS and throttle. I would have gone for a lower powered motor but I can’t find any with the right gearing. And I don’t want to spend £££ on a battery with higher discharge. After all my son will be fine with lower acceleration. Thanks for the help guys!! Julian

thanks for reply. That motor says "Rated current: 13A", did i miss something else? I'm looking at batteries rated to 25A which would be 1200w peak, so wouldnt that be ok for this 500w motor?

Hey [mention=9614]Nealh[/mention], I think i'm going to go with this motor as brushless will give me better PAS control and display etc. What do you think? At 600 RPM i only need to drop the ratio down by a factor of 3 or so to get 200 rpm on the axel which is about what i want. Will getting a PAS and display LCD to work with that controller be quite easy? I would ask the vendor but they're so useless at replying! I've had a look around at 48v batteries and there aren't that many options for European delivery (not keen to wait for a china shipment). Would you have a recommendation for a good option on 10-13ah unit? Looks like i'm in for £200-250 for this, urgh! Do you think i need to worry about the quality/brand of cells? I've read some people (Greencell) bragging about that they use Panasonic, but are the cheaper unbranded batteries ok?

Ahhh! Fab, that looks good. Do you think the PAS is gradual/proportional? Or just on or off?

Sorry Nealh i got a bit confused, this link is for a brushless controller right? You're not suggesting this could be used for brushed? Out of curiosity, on the brushed motors such as this one on eBay, what are all the wires on the controller for? Sadly the eBay posting is not good (i will, of course, ask the seller) but wondered if you can hazard a guess? Could this have PAS on it? I found a similar product and it had connections for motor, battery, charger, isolation switch, lights, brake lights, indicators and throttle, but no PAS :-( https://www.ebay.co.uk/itm/36V-DC-Electric-Motor-Speed-Controller-Throttle-800W-Scooter-Go-kart-E-Bike/293546452860?_trkparms=aid%3D555021%26algo%3DPL.SIMRVI%26ao%3D1%26asc%3D20190711100440%26meid%3D7357dfe5ad8c4a82b269d4e74d31dda8%26pid%3D100752%26rk%3D3%26rkt%3D13%26mehot%3Dpf%26sd%3D274269121076%26itm%3D293546452860%26pmt%3D1%26noa%3D0%26pg%3D2047675%26algv%3DSimplRVIAMLv5WebWithPLRVIOnTopCombiner&_trksid=p2047675.c100752.m1982

Thansk, but that's for a brushless? It says "This controller only works with sensored brushless DC motor "

Ahh yes, of course! Thanks Nealh, you were very helpful on my eBike thread too! I'll need to have a think about this... the two phase geared motors look great as you're getting approx 200RPM output which is very close to what i need on the axel, so no need for huge gear at the back. But it won't allow PAS. My other option was a mid-drive geared unit (3 phase with PAS), can you recommend anywhere to look for one that wont break the bank, but gives me ~500w ? There are few on ebay but all seem to be either crazy expensive or shipping from China and i dont fancy waiting 6 weeks. With a mid-drive unit i might be able to mount it where the existing pedal crank is, i could even cut up an old scrap bike to get a bottom bracket and weld/bolt that to the kart?

Hi all Following good advice on this forum, i've finished a kids eBike conversion using a hub kit. All happy! Now onto the next project: I've got one of these tanks (40kg!): https://www.dino-cars.de/shop/en/gokarts/classics/427/sport-af-red I'd like to convert to pedal-assist powered as it's a huge wagon and heavy, but with pneumatic tyres i think it'll be great fun in the woods and in fields etc for my 10 year old. Stupid question maybe, but are there motor controllers that don't need a throttle, and just rely 100% on the pedaling of the user, using a sensor to determine pedalling speed? I dont want to fit an accelerator foot pedal as the user's feet will be on the rotating pedals. For braking, i will add a disc brake, but any suggestions on how to activate it without adding a brake foot lever (same reason as above, feet will be on the pedals). I guess maybe modify the hand brake lever to be connected to the disc could work? I think that a backpedal motion sensor would be too complicated. For the motor i'm thinking maybe something like this, connected to the axel with a gear wheel that's separate from the pedal drivetrain: https://www.ebay.co.uk/itm/274269121076 Is 350w enough for a 10 year old, 40kg kart and going up hills? All advice welcome!

How about something like this? (With a rack) https://www.amazon.co.uk/dp/B07R2DSMRR/ref=cm_sw_r_cp_api_i_wjpAEbTK9DN32

Thanks for all the info, but I think i'll run with Li-ion and get an entry level off-the-shelf kit with about 8ah capacity. Any tips for a budget option as it maybe something that my son doesnt use a whole lot and keen to keep costs down.

Hmmm, Andy, didn't i say i will not be doing LiPo? No children will be in danger. I will get a Li-ion pack.

Thanks Andy, This is helpful, and highlights the complexity of LiPos, plus the problem of getting two packs and putting in series. Perhaps a better bet is just to buy a 36v Li-Ion pack and forget the LiPo project idea. I was attracted to LiPo as i could potentially share usage of the 18v packs with model RC planes, but it sounds like it introduces a number of extra challenges. The bike usage is very light, no major off road stuff, just buzzing around field/garden/tracks locally. It's for a 9 year old.

OK great, so a buzzer for each lipo pack. Thanks! Jules

silly question but will the bike’s existing calliper style brakes be able to grip onto the rim of the new wheel for braking? The bike I have is a Frog Hybrid: https://www.frogbikes.co.uk/Kids-Hybrid-Bikes-Frog-62?whence=

Thanks everyone for the tips! Glad I’m all set and heading in the right direction for a cheap and simple solution. XT-60 good plan. How would I set the minimum discharge to 3.6v? And I’m curious on why that’s important? Lipo alarm - great idea, hadn’t even considered it but more reliable than looking at the lcd readout perhaps.

Hi all I know it's cheap and cheerful, but I've bought a 36v 24" 250w hub & wheel conversion kit for my kid's bike to use in a large garden/field: https://www.ebay.co.uk/itm/Ebike-Conversion-Wheel-Hub-Kit-36V-250W-48V-500W-1000W-1500W-Electric-MTB-Bike/323966075372?ssPageName=STRK%3AMEBIDX%3AIT&var=513008241183&_trksid=p2057872.m2749.l2649 My assumption is I can buy two of these LiPo packs and wire in series to go from 5S to 10S which is 36v. https://hobbyking.com/en_us/zippy-flightmax-8000mah-5s1p-30c-xt90.html?___store=en_us ...I already have a LiPo charger and know about the dangers of LiPo (I fly model planes with LiPo packs) so will be storing them carefully on the bike and removing for charging. Am I missing anything here? Once i buy the right connectors and solder up a connector to bring the two 5S packs in series into the motor's controller, it should work ok? thanks! Jules