Search found 24017 matches

by amberwolf
Dec 09 2018 9:30pm
Forum: E-Bike Technical
Topic: Ebike issues - strange and unseen
Replies: 12
Views: 232

Re: Ebike issues - strange and unseen

If the controller is the problem (something in it's hall sensor reading ability), and if it is a KT Kunteng Kun Teng controller, you may be able to use the open-source firmware that Casainho / Stancecoke et.al are creating. They also have some for the LCDs for those controller. Just look up Casainho...
by amberwolf
Dec 09 2018 12:20am
Forum: E-Bike General Discussion
Topic: Stromer STX1 -> Hack
Replies: 6
Views: 158

Re: Stromer STX1 -> Hack

It probably will (been done with a number of Stromer rear hubmotors by UUmotor here on ES and elsewhere), but without the Stromer controller you lose the torque sensing PAS, if taht's a feature you like (assuming this model has one like the others I've seen, mounted in a recess at the rear dropout).
by amberwolf
Dec 09 2018 12:03am
Forum: E-Bike General Discussion
Topic: E-bike Powered by Tool Batteries?
Replies: 6
Views: 125

Re: E-bike Powered by Tool Batteries?

I was wondering if anyone has made an e-bike powered with batteries from any of the battery powered tools (e.g. Greenworks, Ego, Ryobi, etc). There's probably dozens of tool pack (toolpack) builds on ES, going back to the old DeWalt A123 packs, to the earliest days of the forum (and probalby before...
by amberwolf
Dec 08 2018 11:57pm
Forum: E-Bike Technical
Topic: Ebike issues - strange and unseen
Replies: 12
Views: 232

Re: Ebike issues - strange and unseen

If the hall sensors themselves operate correctly, when measuring with controller plugged into motor, then it's probably not a connection or hall problem. But it could be a phase problem, either connection between motor and controller, or failed FETs inside the controller. It could also be a mismatch...
by amberwolf
Dec 08 2018 11:43pm
Forum: E-Bike Technical
Topic: bms with canbus
Replies: 3
Views: 91

Re: bms with canbus

CANbus is just a protocol. Commands/data/etc are all device specific. So unless you reverse engineer what the A2B BMS should be sending for each query by the controller, and then figure out how to program that into a new BMS, or build a microcontroller that interprets each way for each device so the...
by amberwolf
Dec 08 2018 11:30pm
Forum: Battery Technology
Topic: Why large parallel connection in battery packs ?
Replies: 5
Views: 168

Re: Why large parallel connection in battery packs ?

As long as there are series connections from every cell in a group to the next series cell, then there's no need for anything but "token" parallel connections. That's probably the better way to do it. "series first, then parallel" is one way to say it. But many packs I've seen are built with only on...
by amberwolf
Dec 08 2018 10:21pm
Forum: Battery Technology
Topic: Resting voltage for LifePo4
Replies: 11
Views: 206

Re: Resting voltage for LifePo4

They are new cells. New new, or new to you new? I ask because "new old stock" that has sat around a long time can have the same issues that cells in-use for some time do. If they sat around fully charged or fully discharged (or worse) all that time, too, then that also negatively affects their beha...
by amberwolf
Dec 08 2018 12:09am
Forum: E-Bike Technical
Topic: The SB Cruiser: Amberwolf&Dogman's 2WD CargoTrike&DogCarrier
Replies: 801
Views: 87628

Re: The SB Cruiser: Amberwolf&Dogman's 2WD CargoTrike&DogCarrier

I've finally had enough time here and there to get the CAv3 setup with the 3.12b3 firmware (vs 3.1 I'd had before), and reset it to factory during the FW upgrade to clear some "invisible" bad settings that were causing me problems with power limiting when running the throttle thru the CA (so I could...
by amberwolf
Dec 07 2018 11:38pm
Forum: Motor Technology
Topic: Controlling a Motenergy ME1117 using CAN Open Protocol
Replies: 2
Views: 220

Re: Controlling a Motenergy ME1117 using CAN Open Protocol

First: why, exactly and specifically, do you want to use CAN? Keep in mind that CAN is just a protocol. Every controller and device will use different actual data and commands, so you have to contact the controller manufacturer to get the CAN commands and format for the specific controller you are u...
by amberwolf
Dec 07 2018 11:23pm
Forum: Battery Technology
Topic: NASA guidlines to safe high perf 18650 cells batteries
Replies: 4
Views: 171

Re: NASA guidlines to safe high perf 18650 cells batteries

If useful, some other NASA battery stuff posted here over the years: https://batteryworkshop.msfc.nasa.gov/presentations/Perf_Safe_Test_Panasonic_Li-Ion_NCR_18650_Cells_JRead.pdf https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20140013497.pdf https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.g...
by amberwolf
Dec 07 2018 11:10pm
Forum: Battery Technology
Topic: Resting voltage for LifePo4
Replies: 11
Views: 206

Re: Resting voltage for LifePo4

Depends on the age and condition of the cell, but older cells often drop down like that.
by amberwolf
Dec 07 2018 11:09pm
Forum: Battery Technology
Topic: Dead cell row can't load test?
Replies: 2
Views: 63

Re: Dead cell row can't load test?

Depends on what's wrong inside, but there's a serious flaw in your testing scheme: If you pass current thru a 0V cell, you are reverse-charging it, as if you had hooked it up backwards to the charger. This is a really bad idea, and depending on what's wrong with teh cell(s) and their chemistry, can ...
by amberwolf
Dec 07 2018 11:05pm
Forum: Battery Technology
Topic: Do I need diodes with this layout?
Replies: 38
Views: 1208

Re: Do I need diodes with this layout?

So after consulting with a few experts in the field of electric golf carts and fork lifts, they are all aghast at the idea of running a system without a contactor. That's primarily because those typically use a brushed motor, which if the controller fails generally leaves the system stuck at full p...
by amberwolf
Dec 07 2018 11:00pm
Forum: Battery Technology
Topic: Replace Cells?
Replies: 16
Views: 296

Re: Replace Cells?

In the past, I was led to believe that BMS often run their continuous processes from the power of a single cell/group, and that if the battery is left idle for a long time, the one cell or group could be drawn down to cutoff voltage while the rest of the pack is nearly full. Is this still true? If ...
by amberwolf
Dec 07 2018 10:43pm
Forum: Battery Technology
Topic: How a Lunacycle / Hailong battery fares after 2 years..
Replies: 38
Views: 1243

Re: How a Lunacycle / Hailong battery fares after 2 years..

And I found out the urethane foam needs air to cure. I had to do it with a cardboard form. Usually it's moisture that cures the stuff in the spraycans. Some might need other things, gases from the air, but I don't remember any that I've used that had to be in open air. Earlier this century when I w...
by amberwolf
Dec 07 2018 10:33pm
Forum: Battery Technology
Topic: Battery Distances and Layout
Replies: 4
Views: 149

Re: Battery Distances and Layout

Making the parallel connections such that they all fan out from the main connection, rather than putting them one to the next (as I suggested) would technically be the "better" way. To do the "fan out" method correctly, so that all resistances from all packs (and thus all loads and all voltage drops...
by amberwolf
Dec 07 2018 10:12pm
Forum: Battery Technology
Topic: Bosch powerpack 400 opening
Replies: 12
Views: 1566

Re: Bosch powerpack 400 opening

Yes, drilling would require care anyway, as you wouldn't want to drill any further than the thickness of the outer case. Drilling into the tab itself would defeat the purpose of the drill hole. ;) Putting a straw or other tube (couple layers of heatshrink) over the drill bit, covering all of it past...
by amberwolf
Dec 07 2018 12:24am
Forum: Battery Technology
Topic: Bosch powerpack 400 opening
Replies: 12
Views: 1566

Re: Bosch powerpack 400 opening

In that case, then as long as you know the length and location of the tabs, you could use a tiny drillbit to make a hole big enough for a pin or paperclip or similar, that lets you loosen the clip without damaging the case in any other way. If the holes compromise water resistance, you can fill them...
by amberwolf
Dec 06 2018 9:26pm
Forum: E-Bike General Discussion
Topic: regenerative braking in winter
Replies: 5
Views: 144

Re: regenerative braking in winter

Or...keep the battery warm, and not have to worry about anything. ;) It's very easy to do. Keep in mind that if you ride on slippery surfaces, the front brake is often unusable, because you lose all steering the instant that wheel skids. If you skid the rear you can usually recover from that, or at ...
by amberwolf
Dec 06 2018 8:57pm
Forum: Battery Technology
Topic: DIY Super Capacitors, and Robert Murray-Smith
Replies: 22
Views: 1663

Re: DIY Super Capacitors, and Robert Murray-Smith

If capacitors were to power ebikes for example, wouldn't you want to develop a motor that runs on very high amps and very low volts since capacitors in series don't add energy capacity? You wouldn't want to power ebikes from capacitors, simply because they are MUCH less energy dense than batteries....
by amberwolf
Dec 06 2018 8:48pm
Forum: E-Bike General Discussion
Topic: regenerative braking in winter
Replies: 5
Views: 144

Re: regenerative braking in winter

It's probably fine, but to know for certain: You have to measure things on your system to know what it's capabilities are, and match them to the spec sheets for the battery (or the cells in it), if you can find out what they are. If you built it, that's relatively easy; if it came prebuilt it requir...
by amberwolf
Dec 06 2018 8:37pm
Forum: E-Bike Technical
Topic: BMS help for MJ1 cells
Replies: 4
Views: 144

Re: BMS help for MJ1 cells

Since Bestech has quite a range of types and specs, I'm not sure what's overkill. I dont' know anything specific about any particular version of their stuff, but they are apparently quite popular. You can look them up in various forum posts and/or threads for others' results with them, and more info...
by amberwolf
Dec 06 2018 8:29pm
Forum: Stand-up E-scooters and E-skateboards
Topic: I'm looking for recommendations for a scooter...
Replies: 14
Views: 250

Re: I'm looking for recommendations for a scooter...

THere are a number of standup scooter mod threads (including an in-progress e300), build threads, and reviews over in the standup scooter section: https://endless-sphere.com/forums/viewforum.php?f=35 Some of them may have the info you're after (but I don't follow much of that section, so don't have ...
by amberwolf
Dec 06 2018 8:22pm
Forum: Battery Technology
Topic: Bosch powerpack 400 opening
Replies: 12
Views: 1566

Re: Bosch powerpack 400 opening

FWIW, there are "laptop case splitters", which are generally a plastic (ABS, nylon, etc; something slightly flexible in thinner sections but fairly stiff in thicker ones) rectangle an inch or two in width, and a couple inches long, around 1/4" thick, tapering to a wedge at one end. The wedge is usua...
by amberwolf
Dec 06 2018 8:00pm
Forum: Battery Technology
Topic: Replace Cells?
Replies: 16
Views: 296

Re: Replace Cells?

Better scary info than a scary incident. ;)

Before you replace them, you should test teh BMS as I noted above, or else it will just kill any new cells, too.