Search found 1785 matches

by flippy
Jul 26 2016 9:31am
Forum: E-Scooter and Motorcycle General Discussion
Topic: 50cc equivalent motor setup help.
Replies: 25
Views: 8697

Re: 50cc equivalent motor setup help.

i would not reccommend that setup with those 7 cell pre made sets. you need something much stronger then the (copper?) tabs alone. you need to have the cells spaced apart slightly and have them in a holder. the copper will move and crack after a while as it hardens due to viberation. having a holder...
by flippy
Jul 19 2016 12:17am
Forum: Battery Technology
Topic: 18650 spot welding -how to- ULTIMATE REPOSITORY
Replies: 790
Views: 195957

Re: 18650 spot welding -how to- ULTIMATE REPOSITORY

it is highly advised to have the highest current capacity where possible and every interconnect between each group will see the same current. 40A on the output means 40A on the interconnect.

more never is a problem, less however....
by flippy
Jul 17 2016 2:42pm
Forum: Battery Technology
Topic: am i shafted with some fake steel nickel strips?
Replies: 10
Views: 1388

Re: am i shafted with some fake steel nickel strips?

report on the above mentioned nickel strip seller: it's pure nickel. the cheap crap i got before is all rusting to hell.
by flippy
Jul 16 2016 1:13pm
Forum: Battery Technology
Topic: am i shafted with some fake steel nickel strips?
Replies: 10
Views: 1388

Re: am i shafted with some fake steel nickel strips?

yes, you got shafted. this is the current (pun intended) bible for strip ratings: https://endless-sphere.com/forums/download/file.php?id=187685 i am currently testing from this seller: http://www.aliexpress.com/item/Free-shipping-18650-battery-nickel-strip-0-3mm-nickel-plate-18650-26650-cell-nickel-...
by flippy
Jul 15 2016 3:59am
Forum: Motor Technology
Topic: Motor inductance variations
Replies: 9
Views: 1085

Re: Motor inductance variations

try measuring from the controller. might be cables that bess stuff up.

I cant see that inductance to blow the ass out of a fet.
by flippy
Jul 15 2016 12:00am
Forum: E-Scooter and Motorcycle General Discussion
Topic: 1979 Honda Electric Dream (CB250N conversion)
Replies: 21
Views: 6284

Re: 1979 Honda Electric Dream (CB250N conversion)

looks like a nice setup. i recommend getting the KLS controller. it's smaller and drives much nicer due to the "proper" sinus, the bump in efficiency is also nice. what idea's do you have with the cells? if reliablillty and lifespan is key then pouches are out. lifepo has poor density and ...
by flippy
Jul 14 2016 11:37pm
Forum: E-Scooter and Motorcycle General Discussion
Topic: 50cc equivalent motor setup help.
Replies: 25
Views: 8697

Re: 50cc equivalent motor setup help.

we already had some back and forth with PM's. he has a 3kW hub motor he can buy from someone. otherwise a decently sized regular motor setup can be used to replace the existing motor and keep the chain drive. plenty of those on the market. regarding battery size: round trip is something you want to ...
by flippy
Jul 14 2016 10:01am
Forum: E-Scooter and Motorcycle General Discussion
Topic: 50cc equivalent motor setup help.
Replies: 25
Views: 8697

Re: 50cc equivalent motor setup help.

just build a bigger fixed battery. cheaper and more wears out a lot less. and where do you plan to keep a 12Ah battery as a spare?
by flippy
Jul 14 2016 4:29am
Forum: E-Scooter and Motorcycle General Discussion
Topic: 50cc equivalent motor setup help.
Replies: 25
Views: 8697

Re: 50cc equivalent motor setup help.

just the stock hub motor that was supplied with the mopeds. currently i am rebuilding the fast one to take the battery from the (older) slow one as the battery boxes are slightly differently welded (due to chinese cheapness) so i am making my own aluminium one for both and also solving the water ing...
by flippy
Jul 13 2016 4:09am
Forum: E-Scooter and Motorcycle General Discussion
Topic: 50cc equivalent motor setup help.
Replies: 25
Views: 8697

Re: 50cc equivalent motor setup help.

(fellow dutch here) i currently have both a blue and yellow plate moped (25 and 50kph) and they both run with a 1.5kw motor. 1.5 is usually plenty, you can boost it up to 2.5+kW wich will outaccelerate almost everyone. (more is not recommended) gettin a battery that can deliver a solid 40~60 amps is...
by flippy
Jul 10 2016 12:01pm
Forum: Battery Technology
Topic: Charging laptop using bike battery?
Replies: 4
Views: 415

Re: Charging laptop using bike battery?

No. Macbooks have DRM built in their charger. Without that signal the laptop refuses to accept any power. There is a getto way of getting around the charge protection but that entails breaking any warranty and hacking the logic board and have a small lead coming out of the laptop as a secondary char...
by flippy
Jul 07 2016 7:49am
Forum: Motor Technology
Topic: Electric scooter throttle
Replies: 2
Views: 522

Re: Electric scooter throttle

first check if it's truly 3 stage or variable (resistor or hall). if it's hall or resistive you will find a 0-5v signal depending on the trottle position on 1 wire. (measure black as ground and check each wire) just put a variable resistor (pot) between the output of the trottle and set the pot as n...
by flippy
Jul 01 2016 6:00am
Forum: Motor Technology
Topic: Modern, compact and powerfull controller
Replies: 20
Views: 1979

Re: Modern, compact and powerfull controller

[quote="John in CR]Controllers are named based on nominal voltage.[/quote]

please tell that to the companies that make the controllers.
by flippy
Jun 30 2016 6:07am
Forum: Battery Technology
Topic: Help please - 6ah power tool batterys repurposed
Replies: 4
Views: 443

Re: Help please - 6ah power tool batterys repurposed

you can run them with 90A peaks but sustained is a whole difference story. try getting the specs sheets and find out the actual sustained rating. pulling 3.5kW from that motor for more then a few seconds will burn it out real fast. making a 10s10p pack will be sufficient for this application and giv...
by flippy
Jun 30 2016 3:52am
Forum: Battery Technology
Topic: Help please - 6ah power tool batterys repurposed
Replies: 4
Views: 443

Re: Help please - 6ah power tool batterys repurposed

you would need to put at least 6 in parralel. so a 10sp8 pack would be bare minimum if you do not want to destroy the pack in less then a year. 10 would be preferable. this is assuming each motor is 45 amps. it is always recommended to have a single BMS that is rated for the use it will see. but i w...
by flippy
Jun 29 2016 2:34am
Forum: Battery Technology
Topic: Solar charging lithium ion cells
Replies: 9
Views: 1340

Re: Solar charging lithium ion cells

Great advice, thank you. All of the BMS I see have over-charge protection that seems too high, like this: http://www.batteryspace.com/pcmwithequilibriumfunctionandfuelgaugefor111vli-ionbatterypackat10alimit.aspx 4.35±0.025V Which to me seems stupid to say it's for lithium ion cells then. If I never...
by flippy
Jun 28 2016 6:51am
Forum: Motor Technology
Topic: Modern, compact and powerfull controller
Replies: 20
Views: 1979

Re: Modern, compact and powerfull controller

18S is 75.5v so it will work no problem.

you will start blowing stuff up beyond 20s.
by flippy
Jun 28 2016 6:29am
Forum: Battery Technology
Topic: Solar charging lithium ion cells
Replies: 9
Views: 1340

Re: Solar charging lithium ion cells

you do no need a specific solar verion. but it would help greatly to have a real MPPT solar charger as that is the most efficient in order to get the maximum from the panel. (do not expect to get anywere near 10w with that panel unless you live in the desert) real MPPT is hard to find on ebay as mos...
by flippy
Jun 27 2016 7:22am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Zero torque after "warm start"
Replies: 14
Views: 2423

Re: Zero torque after "warm start"

you can just grab 12v from the inverter that drives the lights and grabd a 7805 and replace the 5v feed from the controller in order to drive the hall sensors. just put some heat shrink around it, it does not get hot at all.
by flippy
Jun 24 2016 1:18am
Forum: Battery Technology
Topic: Making A Distance Trike, I just might go SLA
Replies: 9
Views: 755

Re: Making A Distance Trike, I just might go SLA

why even use a ICE on a trailer? would a aditional battery pack with capable charger not be more effective? last time i checked you can find more power plugs beside the road then gas stations. put a high end 280W panel on the top of the trailer and you can run virturally without any support from mai...
by flippy
Jun 24 2016 12:42am
Forum: Battery Technology
Topic: Making A Distance Trike, I just might go SLA
Replies: 9
Views: 755

Re: Making A Distance Trike, I just might go SLA

Before you die of shock, allow me to explain. Lithium is expensive, plus it isn't as straight forward as SLA is when it comes to charging while riding. (solar or generator) I am thinking about doing a tricycle and throw some SLA batteries in the cargo or lower-mid frame and have a generator charge ...
by flippy
Jun 23 2016 8:37am
Forum: Battery Technology
Topic: Can i use a 24V Lifepo4 charger for 24V Lion?
Replies: 6
Views: 919

Re: Can i use a 24V Lifepo4 charger for 24V Lion?

Yes you can, voltage is the same so no problem.


And disconnect after charging. Do not leave floating for days on the charger.
by flippy
Jun 21 2016 1:14am
Forum: Battery Technology
Topic: How do I convert amps going out to mah being used
Replies: 4
Views: 626

Re: How do I convert amps going out to mah being used

capacity is expressed in Wh or mAh.

if you have a 2400mAh cell and drain it in 3 hours you consume 800mA on average
by flippy
Jun 20 2016 2:00pm
Forum: Battery Technology
Topic: How do I convert amps going out to mah being used
Replies: 4
Views: 626

Re: How do I convert amps going out to mah being used

mah only tells you the capacity, not the current usage. how long does the tablet run with the battery? divide that by the ah rating and you have the average current consumption. by the way, a 4.2v lipo cell with a capacity of 2400mah is only 10.4Wh, not 88Wh. pushing 2.4 amps into that cell if it's ...
by flippy
Jun 13 2016 2:46pm
Forum: EBike Technical
Topic: Henry111's free tech support thread
Replies: 984
Views: 42821

Re: Most prevalent battery problem?

Sorry, but it depends on too many factors. Did you buy your pack from a quality retailer or from alibaba or even a diy builder? Was the pack built with "economic restraint" or were high quality components used? There are too many variables to give a answer to this as some only deal with re...