Search found 150 matches

by kcuf
Oct 03 2019 4:33pm
Forum: E-Bike Technical
Topic: Troubleshooting ebike battery
Replies: 8
Views: 161

Re: Troubleshooting ebike battery

sickly sweet cherry solvent

don't breath it

some cells might be salvageable

but not leaking pouches

pretty much scrap
by kcuf
Sep 18 2019 10:03pm
Forum: E-Bike Non-hub Motor Drives
Topic: Most reliable Mid drive motor kit?
Replies: 16
Views: 780

Re: Most reliable Mid drive motor kit?

bbsxx

stock factory power level

exceeds continuous rating


levels 1-9 enabled

use 6 or below

will not exceed continuous limit
by kcuf
Sep 18 2019 4:37pm
Forum: E-Bike Non-hub Motor Drives
Topic: Most reliable Mid drive motor kit?
Replies: 16
Views: 780

Re: Most reliable Mid drive motor kit?

stay under 1000w bbshd very reliable

nyc cargo ebikes well over +10k miles


stay under 500w bbs02 very reliable


trouble is most users operate bbshd 1500w

or 900-1000w bbs02


not gonna last @ those levels
by kcuf
Sep 16 2019 10:14am
Forum: Battery Technology
Topic: Damaged Li-ion batteries?
Replies: 10
Views: 284

Re: Bloated Li-ion batteries?

buy lotto ticket today

you are lucky
by kcuf
Sep 16 2019 10:13am
Forum: E-Bike Non-hub Motor Drives
Topic: BBSHD on 72V 50A controller?
Replies: 6
Views: 258

Re: BBSHD on 72V 50A controller?

1500w continuous will damage bbshd/03

short bursts usually don’t

unless too many bursts

non-sinewave controller will sound like engraver
by kcuf
Sep 12 2019 3:21pm
Forum: Battery Technology
Topic: 12v charging for 48v battery?
Replies: 8
Views: 311

Re: 12v charging for 48v battery?

boost converter current will vary

across pack charging curve

max amp setting often limited

within narrow voltage span



simple effective numerous choices

12vdc inverter to 120vac

back to whatever dc required



some losses yeah

big deal ?

not here
by kcuf
Sep 04 2019 3:07pm
Forum: E-Bike General Discussion
Topic: Foldable e-bikes - which one to buy?
Replies: 13
Views: 619

Re: Foldable e-bikes - which one to buy?

luna mosso folder

similar to what i suggest

very fair price for everything



think best get to know

local ebike mech/tech

pre built eventually need work too
by kcuf
Sep 01 2019 7:56pm
Forum: E-Bike General Discussion
Topic: Foldable e-bikes - which one to buy?
Replies: 13
Views: 619

Re: Foldable e-bikes - which one to buy?

need mid drive for steep hills

get to know ebike mechanic

local to you

hire to convert $300-$600 dahon

use bafang bbs02

300-750Wh battery pack(s)

$1500 parts

$ remains for labor
by kcuf
Aug 29 2019 11:43am
Forum: E-Bike Technical
Topic: charging 36v from 12v
Replies: 27
Views: 892

Re: charging 36v from 12v

use similar schemes here


dc converters do work

sometimes tricky current limiting load side



36v rc can be difficult to source

i travel with small 106B

helps touching up few cells



automotive inverter often easiest 12vdc to VAC line supply

likely already have VAC bulk charger
by kcuf
Aug 23 2019 2:31pm
Forum: E-Bike Non-hub Motor Drives
Topic: Bafang BBHD 48v 1000w: Controller dead?
Replies: 12
Views: 362

Re: Bafang BBHD 48v 1000w: Controller dead?

disable auto off

may avoid shutdown

when no speed sensor
by kcuf
Aug 15 2019 11:28am
Forum: General Discussion
Topic: How to identify antennas?
Replies: 25
Views: 896

Re: How to identify antennas?

don't talk to devices

put em where they do the most good
by kcuf
Aug 15 2019 8:34am
Forum: General Discussion
Topic: How to identify antennas?
Replies: 25
Views: 896

Re: How to identify antennas?

best antenna is elevation
by kcuf
Aug 15 2019 8:27am
Forum: Battery Technology
Topic: Building a LiPo pack with high discharge (burst 300A) and BMS
Replies: 19
Views: 447

Re: Building a LiPo pack with high discharge (burst 300A) and BMS

double or more any c rate spec

consider bms for charge only

discharge directly from cell tabs

regularly monitored for balance and ir
by kcuf
Aug 12 2019 7:06am
Forum: E-Bike Non-hub Motor Drives
Topic: BBSHD dies after 10 seconds, again and again.
Replies: 8
Views: 344

Re: BBSHD dies after 10 seconds, again and again.

no sensor

sleep settings

influence off time
by kcuf
Aug 12 2019 7:02am
Forum: E-Bike Technical
Topic: Q128C motor teardown reviews new version corrected clutch spring issue.
Replies: 5
Views: 207

Re: Q128C clutch is starting to slip.

majority instances

clutch action can be improved

springs die become mangled

no longer

push rollers

into ramp

check replace

use generic springs
by kcuf
Jul 22 2019 11:26am
Forum: E-Bike General Discussion
Topic: I saw a park ranger call out an e-bike rider on FL bike path.......
Replies: 41
Views: 1466

Re: I saw a park ranger call out an e-bike rider on FL bike path.......

throttle ban ignorant


reasonable laws

brake cutoffs

lighting if night

ride safely
by kcuf
Jul 22 2019 11:19am
Forum: General Discussion
Topic: Insert Molding Plastic Cables
Replies: 9
Views: 536

Re: Insert Molding Plastic Cables

cool stuff

suspect expensive

but if money no object

great clean wiring
by kcuf
Jul 22 2019 11:17am
Forum: E-Bike Non-hub Motor Drives
Topic: Converting B'twin Bike to Electric
Replies: 59
Views: 1774

Re: Converting B'twin Bike to Electric

understand nominal voltage rating battery voltages perform across wide voltage range 72v lithium pack envelope usually between 60-84v almost 25v difference full to empty soc next thesis understand voltage changes under load vs open circuit ohms law is your friend that platform front geared hub good ...
by kcuf
Jul 13 2019 8:37am
Forum: Battery Technology
Topic: voltage drop under load (maybe a simple question?)
Replies: 28
Views: 998

Re: voltage drop under load (maybe a simple question?)

54.6v is 48v 13s top charge

if measurements correct

pack is not fully charging
by kcuf
Jul 11 2019 8:59am
Forum: Motor Technology
Topic: Measure RPM with video camera
Replies: 6
Views: 284

Re: Measure RPM with video camera

many phone apps

strobe measurement
by kcuf
Jul 11 2019 8:56am
Forum: E-Bike Non-hub Motor Drives
Topic: Should a 8S cassete be a good option for e-bikes?
Replies: 18
Views: 875

Re: Should a 8S cassete be a good option for e-bikes?

chain wear gauge

used regularly

any sign wear

replace chain

cogs last much longer




replacement interval

cheap 6-8 speed stuff

about 1000 mile

2 months my commute
by kcuf
Jul 10 2019 9:23pm
Forum: Items for Sale - New
Topic: Electric Fat Bike from SEKIBIKES.COM
Replies: 8
Views: 684

Re: Electric Fat Bike from SEKIBIKES.COM

forum rules

require price

for sale items
by kcuf
Jun 29 2019 6:59pm
Forum: Motor Technology
Topic: Bafang BBS01 Error 30 -> Controller broken?
Replies: 3
Views: 262

Re: Bafang BBS01 Error 30 -> Controller broken?

on good day

bbs02 barely tolerates

750w continuous

more like 600-700w

especially hot days


many programmings

full throttle or high PAS

exceed 1000w


major difference between

peak and continuous wattage



limiting average power prevents

damage to controller