Search found 165 matches

by kcuf
Jan 06 2020 10:08am
Forum: E-Bike Technical
Topic: Doesn't make sense.. does my battery broken?33mΩ too much ir??
Replies: 19
Views: 493

Re: Doesn't make sense.. does my battery broken?33mΩ too much ir??

5 bricks #1 cell reading high ir

correct?

suspect more likely imax problem

recommend dc ir test

10s known amp load

use voltage drop to calculate ir

youtube lipo ir testing
by kcuf
Jan 06 2020 10:02am
Forum: E-Bike Technical
Topic: Push Button Throttle
Replies: 19
Views: 482

Re: Push Button Throttle

in most cases

feed throttle switched 4.5vdc

higher than that might not work

may interpret full 5vdc as error

disables controller
by kcuf
Dec 24 2019 1:07pm
Forum: E-Bike General Discussion
Topic: Chain break blues...drivetrain upgrade options?
Replies: 15
Views: 873

Re: Chain break blues...drivetrain upgrade options?

avoid wimpy light duty bicycle components

8 speed steel stuff wins round

frequently use wear gauge

replace cheap steel chain showing any signs stretch wear
by kcuf
Dec 24 2019 1:04pm
Forum: E-Bike Non-hub Motor Drives
Topic: BBS02 - 10S Cassette cogs eating freewheel spline & remedies
Replies: 4
Views: 413

Re: BBS02 - 10S Cassette cogs eating freewheel spline & remedies

avoid wimpy light duty bicycle components

8 speed steel stuff wins these situations
by kcuf
Nov 30 2019 10:57am
Forum: E-Bike Build Threads / Photos & Video
Topic: its about time i shared with you! e-bikes and e-skateboard
Replies: 1
Views: 451

Re: its about time i shared with you! e-bikes and e-skateboard

nice work love to see more

good tune too

imbed for ya

by kcuf
Nov 30 2019 10:52am
Forum: E-Bike General Discussion
Topic: About to click buy. Am I missing anything, or doing something wrong?
Replies: 20
Views: 1683

Re: About to click buy. Am I missing anything, or doing something wrong?

didnt see those dropouts before

not ideal but manageable

very tight axle should hold

or add something as a stop

to any forward movement

if its problem
by kcuf
Nov 30 2019 10:46am
Forum: E-Bike Technical
Topic: Why doesn't a li-ion battery take load?
Replies: 24
Views: 1753

Re: Why doesn't a li-ion battery take load?

lesson learned junk cells

never buy cells with fire in name
by kcuf
Nov 27 2019 9:06am
Forum: E-Bike General Discussion
Topic: About to click buy. Am I missing anything, or doing something wrong?
Replies: 20
Views: 1683

Re: About to click buy. Am I missing anything, or doing something wrong?

if lg

if properly welded

if decent bms

likely good battery pack


many vendor dont lie

many suppliers do


basically gamble

unattended charging

do where can survive fire


good luck
by kcuf
Nov 27 2019 6:58am
Forum: E-Bike General Discussion
Topic: About to click buy. Am I missing anything, or doing something wrong?
Replies: 20
Views: 1683

Re: About to click buy. Am I missing anything, or doing something wrong?

dunno seller gear sensor no big deal stop pedaling or simply shift when motor rpm winds up and watts go down ebay likely source if you must 12ga wire and choose power connectors many use app anderson power pole you will not longer need front shifter battery may fit or use problem solving sunrace slm...
by kcuf
Nov 26 2019 5:23pm
Forum: E-Bike General Discussion
Topic: 72 volt battery only chargers to 81 volts not 83volts
Replies: 14
Views: 1559

Re: 72 volt battery only chargers to 81 volts not 83volts

if resting charger 83v

81v pack may be out of cell balance
by kcuf
Nov 25 2019 8:35am
Forum: E-Bike Technical
Topic: Measuring a battery's health
Replies: 6
Views: 666

Re: Measuring a battery's health

search youtube lipo ir testing internal resistance dont change much using high or low amps as mandog explain 180w fine for basic capacity testing important thing good balancing following common bms balancing many chargers wont reinitiate charge therefore load small amount recharge rinse repeat sever...
by kcuf
Nov 20 2019 1:15pm
Forum: E-Bike General Discussion
Topic: Fat Tire E bike Conversion
Replies: 17
Views: 1949

Re: Fat Tire E bike Conversion

balmorhea doesn’t know whats ridden for attention

obvious why the post was made

therapy helps
by kcuf
Nov 08 2019 11:55am
Forum: E-Bike General Discussion
Topic: Fat Tire E bike Conversion
Replies: 17
Views: 1949

Re: Fat Tire E bike Conversion

fat tires less efficient of course

severe depends on perspective



mid drive for noticeable incline efficiency

often simple install bbshd 100 120
by kcuf
Nov 01 2019 8:49am
Forum: E-Bike Non-hub Motor Drives
Topic: BBSHD vs. BBS02?
Replies: 13
Views: 1625

Re: BBSHD vs. BBS02?

use both extensively continuous power dissipation is key hd rated to dissipate 1000w continuous peaks 1500w okay but not for long newest 02 rated 750w continuous but not really 600w continuous safe range very intermittent peaks 1000w okay not powering fat tire bike ride more like pedal bicycle 02 li...
by kcuf
Oct 03 2019 4:33pm
Forum: E-Bike Technical
Topic: Troubleshooting ebike battery
Replies: 8
Views: 359

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: 1219

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: 1219

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: 464

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: 454

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: 441

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: 820

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: 820

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: 1214

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: 644

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

disable auto off

may avoid shutdown

when no speed sensor