Search found 35 matches

by timmy66
Nov 10, 2017 5:27 am
Forum: Battery Technology
Topic: mean well rpb-1600, programmable charger ~1600w
Replies: 1
Views: 213

mean well rpb-1600, programmable charger ~1600w

Searched quickly, a programmable charger doing up to 58.8V / 28 A , controllable via PMbus , CC / CA. pdf spec sheet https://www.meanwellaustralia.com.au/file/11733/download?token=u4GTTiS- product page: https://www.meanwellaustralia.com.au/products/rpb-1600 ~$300 in the USA. About 3x more expensive ...
by timmy66
Nov 09, 2017 11:52 am
Forum: Battery Technology
Topic: Plausible to build custom variable voltage Lion charger?
Replies: 30
Views: 1159

Re: Plausible to build custom variable voltage Lion charger?

Someone has figured out the communication protocol, no need to buy Mean Wells programmer interface. https://github.com/Zweikeks/meanwell-enc-series-chargelog from http://www.irv2.com/forums/f54/program-and-monitor-mean-well-enc-series-of-battery-chargers-e-g-enc-120-12-a-342716.html Very nice, maybe...
by timmy66
Nov 05, 2017 1:02 pm
Forum: Battery Technology
Topic: What is the "Light Weight" go to "Hobby" Lithium packs
Replies: 43
Views: 2140

Re: What is the "Light Weight" go to "Hobby" Lithium packs

Am curious for these types of packs -- how well are they maintaining their balance when used this way?

What is the estimated lifetime of these types of packs - same as modern 18650 cells?

Nice seeing a reasonable option, thanks for sharing.
by timmy66
Nov 05, 2017 11:19 am
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1756
Views: 47172

Re: 48v/~750-1000W controller recommendation for openSource

This is a very interesting project, I can see you've done a lot of work here. Are you concerned that you won't have a platform for using it if BMSBattery stops selling this? Or if you've gotten the schematic well documented, maybe invite someone else to produce the hardware so there's no issue with ...
by timmy66
Nov 03, 2017 1:07 pm
Forum: E-Bike Reviews & Testing
Topic: S12S Sine Wave Controller
Replies: 14
Views: 4081

Re: S12S Sine Wave Controller

Curious if there's a source for these with less expensive shipping ($35 to USA). Shipping is same price as controller!!

I'm interested in buying one to experiment with casainho's open source firmware.

Any followups (bad) news from those that have been using this for a few years now?

Thanks.
by timmy66
Nov 03, 2017 3:38 am
Forum: Motor Technology
Topic: Flexible OpenSource firmware for BMSBattery S/Kunteng KT motor controllers (0.25kW up to 5kW)
Replies: 1756
Views: 47172

48v/~750-1000W controller recommendation for openSource

Could you make a quick recommendation for helping with the project : I have a 48V standard "9c" type wheel - what controller would you suggest that would work with your firmware/development, that's around 1000 W or less. Several of the controllers seem to be in the low watt range, I'm more intereste...
by timmy66
Oct 31, 2017 6:32 am
Forum: Battery Technology
Topic: Testing the HP ESP-135 Server supply and isolation modding.
Replies: 44
Views: 8990

Re: Testing the HP ESP-135 Server supply and isolation moddi

I've read thru this and other threads talking about stacking several 12V power supplies in series, and then adding a lab type power supply that's current limited. I'm not sure I understand this really well -- the lab supply functions as the constant current part that will do the transition to consta...
by timmy66
Oct 25, 2017 11:02 am
Forum: Battery Technology
Topic: Normal 48V cell # equivalent for LiFePO4
Replies: 2
Views: 158

Normal 48V cell # equivalent for LiFePO4

Curious for others that have built their own packs, if you'd opted for 15s, 16s, or higher ?? for DIY'ing your own packs with LiFePO4 cells. It seems their discharge curves flatten more around 3.2V than their charging 3.6'ish V rating -- making you want to add another series group or three, to have ...
by timmy66
Oct 25, 2017 3:50 am
Forum: Battery Technology
Topic: Plausible to build custom variable voltage Lion charger?
Replies: 30
Views: 1159

Re: Plausible to build custom variable voltage Lion charger?

I think you'd use the relay to turn off the charger completely (it breaks the NC connection to be open when the under current condition works, or you'd cheat the charger to be on while setting it, and let it operate as it would then be in the non-under-current mode, and it would remove power to char...
by timmy66
Oct 24, 2017 1:29 pm
Forum: Battery Technology
Topic: Plausible to build custom variable voltage Lion charger?
Replies: 30
Views: 1159

Re: Plausible to build custom variable voltage Lion charger?

These are available stocked in the US for about $19 shipped, too, eg. https://www.ebay.com/itm/New-900W-DC-DC-Boost-Converter-8-60V-to-10-120V-15A-Step-Up-Power-Supply-Module/291861952982? This is a current detection board that could be used to force a cutoff when you get to C/10, https://www.ebay.c...
by timmy66
Oct 24, 2017 12:59 pm
Forum: Battery Technology
Topic: Toying with a cheap hoverboard BMS
Replies: 34
Views: 1037

Re: Toying with a cheap hoverboard BMS

I've bought some of these packs, too, same as photoed above. One of the problems in these is that there is a single 8mmx0.15mm (or less?) strip of nickel carrying the series current in several links along the 10s strings. Many others have posted that the most current this would be suitable for is ar...
by timmy66
Oct 05, 2017 12:12 pm
Forum: Resources & EV Related Parts and Services
Topic: Received 150 NCR18650GA cells from Nkon to California USA
Replies: 6
Views: 831

Re: Received 150 NCR18650GA cells from Nkon to California US

Some cells actually need higher discharge rates to get the rated value, eg, Samsung 25R I think needed 10A discharge to get a higher capacity rating, instead of a simple 1C or less.
by timmy66
Sep 30, 2017 4:12 pm
Forum: Battery Technology
Topic: cheap 1s-8s buzzerAlarm : doesn't work for 7/8s
Replies: 3
Views: 186

Re: cheap 1s-8s buzzerAlarm : doesn't work for 7/8s

Thanks @AW// exactly the issue.

There must be a million out there like this.
by timmy66
Sep 30, 2017 12:27 pm
Forum: Battery Technology
Topic: cheap 1s-8s buzzerAlarm : doesn't work for 7/8s
Replies: 3
Views: 186

cheap 1s-8s buzzerAlarm : doesn't work for 7/8s

http://www.ebay.com/itm/RC-Lipo-Battery-Low-Voltage-Alarm-1S-8S-Buzzer-Indicator-Checker-Tester-LED-Best-/282397825614 Tried searching to see if similar reports, I bought a good handful of these from 3 different sellers, and each and every one does not properly measure cells 7s and 8s. With all cell...
by timmy66
Sep 30, 2017 11:42 am
Forum: Battery Technology
Topic: BMS: inexpensive programmable balance points?
Replies: 1
Views: 263

BMS: inexpensive programmable balance points?

Seems great being able to double or quadruple battery packs by charging to 4.0 or 4.1V per cell group, but it seems almost all the normal (<$30) BMS'es out there don't balance unless going all the way to 4.2V -- and perhaps the bulk charging is not perfectly precise, and then a specific group is nev...
by timmy66
Sep 30, 2017 11:31 am
Forum: Battery Technology
Topic: Homemade Battery Packs
Replies: 1521
Views: 325664

Re: Vetting Floureon (7s 25.9V 5000mAh)

Copy of post from alternate thread. My 1st "vetting" of high output (40C) LiPo. Will definitely keep ziplock bag handy for in ... weather. Might need to shade due to sun-heat "blackage"?" Dear DrkAngle : Have you had good experience with the accuracy of both that current meter you're showing, and t...
by timmy66
Sep 25, 2017 2:16 am
Forum: Battery Technology
Topic: problems with cheap DC DC boost supplies for charging?
Replies: 1
Views: 216

problems with cheap DC DC boost supplies for charging?

http://www.ebay.com/itm/600W-DC-DC-Solar-Power-Adjustable-Step-up-Boost-Voltage-Converter-Module-Board/112402911989 Have gotten one of these to charge a lithium pack, it´s a 600W 10-60V -> 12-80V boost converter. This seems like an ideal bulk charging solution, but I was watching it with the CV conf...
by timmy66
Sep 24, 2017 1:18 am
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 1509
Views: 111183

Re: New "TSDZ2 Torque Sensor Central Motor"

Thanks @eyeBye, How are you seeing those values? I'm got a watt meter that I use on a bike that shows instantaneous current/power values -- is that how you're seeing those (11 / 13 / 18); or are you estimating what the values should be, based on the motor ratings? Any comments on what the "A" screen...
by timmy66
Sep 23, 2017 6:13 pm
Forum: E-Bike Non-hub Motor Drives
Topic: New "TSDZ2 Torque Sensor Central Motor"
Replies: 1509
Views: 111183

Re: New "TSDZ2 Torque Sensor Central Motor"

Would someone using the 500w or 750w or 350w version care to give your "max current" obervations? Some other motor/controller combinations will say "500w", but for a few seconds will indeed pull almost twice that. A front hub I have easily gets into the 900watts when bogged down on a hill. Is the sa...
by timmy66
Sep 23, 2017 11:40 am
Forum: Battery Technology
Topic: dc dc cnverters, 12-80V -- where??
Replies: 9
Views: 449

Re: dc dc cnverters, 12-80V -- where??

Thanks for the replies; the question came from seeing a large range of headlights that are 12-80V compatible, that cost like $4 on ebay. So surely there must be a similar DC DC over that input range that could get down into the same ~5V output. I found a few low cost variants that cover the normal e...
by timmy66
Sep 20, 2017 2:34 pm
Forum: Battery Technology
Topic: dc dc cnverters, 12-80V -- where??
Replies: 9
Views: 449

dc dc cnverters, 12-80V -- where??

There is no shortage of $1-2 dc-dc converters for up to about 36V, ~10w total power output, but don't see many going at least to 60V, which gets into normal batteries that we're using on ebikes. Anyone know of some equivalents of these, with a slightly wide input voltage range? Just for powering som...
by timmy66
Sep 20, 2017 10:25 am
Forum: E-Bike General Discussion
Topic: Do I need a spacer between rear hub and freewheel? (+ pics)
Replies: 16
Views: 1448

Re: Do I need a spacer between rear hub and freewheel? (+ pi

Thanks for responses; the other question I'm not so sure about either is if there should have been a larger sleeve that goes over the axle here; as it seems that any washer here (circled) is sitting on a very small shoulder to provide the resistance back against the inside of the dropout, that's get...
by timmy66
Sep 20, 2017 4:00 am
Forum: E-Bike General Discussion
Topic: Do I need a spacer between rear hub and freewheel? (+ pics)
Replies: 16
Views: 1448

Re: Do I need a spacer between rear hub and freewheel? (+ pi

Thanks @AW/

That's probably exactly the best solution. Just $15 shipping tho to USA.

Gotta be a cheaper source of these things? Surely price per piece from China folks that include them with other kits is a dime or two.

Ebay almost has nothing in this category.
by timmy66
Sep 20, 2017 3:56 am
Forum: Motor Technology
Topic: basic question motor controllers -- max current
Replies: 9
Views: 327

Re: basic question motor controllers -- max current

@Al - so it sounds like the slow (average) current methods all depend on the peak instantaneous needs not getting chopped by the typical battery BMS, which also has a specification that's probably measuring in the same way that the cheap controller is. Any idea what typical motor instantaneous curre...
by timmy66
Sep 20, 2017 3:07 am
Forum: E-Bike General Discussion
Topic: Do I need a spacer between rear hub and freewheel? (+ pics)
Replies: 16
Views: 1448

Re: Do I need a spacer between rear hub and freewheel? (+ pi

Similar question -- on a 9c rear hub, the washer that sits on the shoulder (see photo, taken from ebikes.ca ad for 9c) -- the washer normally that would be compressed by the inside of the drive-side dropouts is not very secure here. It's not notched, so it's a real 14mm ID (for axle), which leaves v...