Search found 282 matches

by leffex
Mar 28 2020 3:19pm
Forum: Battery Technology
Topic: Charging with higher voltage charger
Replies: 14
Views: 382

Re: Charging with higher voltage charger

Im aware of the dangers, and I will not be using this on a regular basis. Pack was sitting on a concrete floor with me within 5m regularly checking the BMS. When the cells reached 4.1v, the BMS stopped the charging as I programmed it for. The cells settled just above 4.0v, and in perfect balance, s...
by leffex
Mar 10 2020 3:13pm
Forum: Battery Technology
Topic: Making a small pack 5S24P
Replies: 16
Views: 1615

Re: Making a small pack 5S24P

At last a new year and time to use those batteries. I have in total build three of these batteries and here they are in all their glory. https://i.imgur.com/WEJsj83.jpg The first was a 24p which was then changed to 25p for the two last packs. There's a 2s Sanyo Ga 20p ready to start its life soon in...
by leffex
Mar 08 2020 6:53pm
Forum: Battery Technology
Topic: Batteries involving 40T, 30Q and MJ1 cells. Preferences and opinions.
Replies: 17
Views: 527

Re: Batteries involving 40T, 30Q and MJ1 cells. Preferences and opinions.

The reasons are: weight and smallness. I want to keep it as small and light as possible. I plan to take it with me when I park the bike. 200 Wh is about all I need, and even with just that I expect to stay in the 80 to 20% SoC range. I would add that if you want your bike to be lighter then you cou...
by leffex
Mar 08 2020 1:14pm
Forum: Battery Technology
Topic: Batteries involving 40T, 30Q and MJ1 cells. Preferences and opinions.
Replies: 17
Views: 527

Re: Batteries involving 40T, 30Q and MJ1 cells. Preferences and opinions.

1) a 14sx1p battery made with 21700 40T cells (50.4 V) 2) a 10sx2p battery made with 18650 30Q cells (36 V) 3) a 10sx2p battery made with 18650 MJ1 cells (36 V) 4) a 10sx2p battery made with 18650 MG1 cells (36 V) These all contain roughly the same power (200 Wh). I am thinking of a continuous curr...
by leffex
Mar 04 2020 9:50pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 381
Views: 37999

Re: Li-ion cells cycle ageing

I also noticed the Samsung 30Q had some dfifference. However the capacity graph on the side states 100% to 80% and is very similar to Panasonic, Sanyo ga, Sony vtc6 and possibly samsung 35e in the future. I have and like alot of cells like Samsung 29E, Panasonic PF. They seem to come in three versio...
by leffex
Mar 04 2020 9:30pm
Forum: Battery Technology
Topic: Just found 2000 LiFePo 18650 cells in the recycler
Replies: 9
Views: 515

Re: Just found 2000 LiFePo 18650 cells in the recycler

If you have any use of them or spare time to sell them after you have tested them straight to be working - that adds value. Without anything I'd se a value of 0-1$ each. tested 1$ or less if one can buy bulk from you. However the market ain't starting for 18650 cells and life4po. Question is why the...
by leffex
Feb 07 2020 2:29pm
Forum: Battery Technology
Topic: 3D Printed Hailong/Reention Style E-Bike Battery Case
Replies: 12
Views: 989

Re: 3D Printed Hailong/Reention Style E-Bike Battery Case

Very cool gomyles. Do you make the bottom bracket as well that you mount on the bike and then add the battery onto?

How many pieces of 3d printing is this?

You can make the 3d print like this and then connect them toghether

U - pieace and _ piece
by leffex
Feb 03 2020 1:50pm
Forum: Battery Technology
Topic: Why High C Rate Cells Live Less than Low C Rate?
Replies: 10
Views: 521

Re: Why High C Rate Cells Live Less than Low C Rate?

I would love to use 50e cells for my battery builds but I can't stand they are weak in one sense. I mean 10p 40t cells can be replaced by 35p 50e 21s35p is to big of a battery. (to run them at lower power for better cycle life) What I do to fix this is? Fix a fast charger. is 3000w fast enough? Sure...
by leffex
Feb 03 2020 1:42pm
Forum: Battery Technology
Topic: Why High C Rate Cells Live Less than Low C Rate?
Replies: 10
Views: 521

Re: Why High C Rate Cells Live Less than Low C Rate?

https://endless-sphere.com/forums/viewtopic.php?f=14&t=102682&start=75#p1504990 Check the reply above. or https://i.imgur.com/FRRahFf.jpg and to the right, check the ratio-. Compare the cells 29e, 35e and 50e and dcir acir ratio is about 1,2. Compare 25r and 40t and the ratio is about 1.4 I would sa...
by leffex
Feb 01 2020 6:32am
Forum: Battery Technology
Topic: How many (V) per (1000w) Output to you drop?
Replies: 52
Views: 2293

Re: How many (V) per (1000w) Output to you drop?

"Early Gen1 used 14Kwh of 16Kwh, the later ones used more of a larger bank.." yes you are right. There is very little room for improvement with larger wires at this point... sure I get it. I got 3awg or 25mm^2 for phases and battery leads. Best I have found on terms of power delivery,too, and longe...
by leffex
Jan 31 2020 8:31am
Forum: Battery Technology
Topic: How many (V) per (1000w) Output to you drop?
Replies: 52
Views: 2293

Re: How many (V) per (1000w) Output to you drop?

As a percentage, I drop 6.43% of the voltage on a 8000w output with my battery. Are you happy with your battery and the power it gives to you or do you want a better one? The Chevy volt battery is probably the best in terms of longevity. Maybe because of the internal "cooling system" that cools the...
by leffex
Jan 31 2020 8:18am
Forum: Battery Technology
Topic: How many (V) per (1000w) Output to you drop?
Replies: 52
Views: 2293

Re: How many (V) per (1000w) Output to you drop?

I mean, I do know a thing or two, guys. Cant ya just answer my non empirical baseless unlovable non proven doesnt make sense formula question again? Lol. My research is to cut corners where there are no safety guards around. With more sources the value of the info exponentially increases. Just beca...
by leffex
Jan 29 2020 2:39pm
Forum: Battery Technology
Topic: How many (V) per (1000w) Output to you drop?
Replies: 52
Views: 2293

Re: How many (V) per (1000w) Output to you drop?

Is this good? How many volts do you ( on average) drop for every 1000w output? Curious here. Never had an 18650 pack. Your battery pack drops 1,25v for a 1000w output from an input of 82,5v x 12,5A One measure point to use is to draw the same amps from another pack. If that pack is double the amp a...
by leffex
Jan 24 2020 1:30pm
Forum: Battery Technology
Topic: Homemade Battery Packs
Replies: 1681
Views: 498179

Re: Homemade Battery Packs

DrkAngel wrote:
Jan 23 2020 8:14am
...
Please update us a little information is good enough!
by leffex
Jan 21 2020 7:13pm
Forum: Motor Technology
Topic: TSDZ2 mid drive with 860C, 850C or SW102 displays only -- Flexible OpenSource firmware (Casainho code only)
Replies: 4985
Views: 349526

Re: TSDZ2 mid drive and 850C and SW102 displays only -- Flexible OpenSource firmware (Casainho code only)

does anyone need an opened display of a normal tong sheng motor. For research or whatever
what other parts may be of interesst as I may get a hold of some that are broken in different ways, cosmetic or others like one button not working etc.
by leffex
Jan 13 2020 6:00pm
Forum: Polls & Surveys
Topic: Which hybrid electric car will be yours in the future?
Replies: 10
Views: 931

Re: Which hybrid electric car will be yours in the future?

DIY Hybrid or fully electric VW Passat 3B2 8) Haha. They also have the plug-in golf and passat GTE! :D Statistics says that most users drive 80-90% with electricity only. (w plug-in car) Say an example car total running costs (Sweden, dinosaur based on economy car): Comparisson cost per 10000km dri...
by leffex
Jan 13 2020 4:18pm
Forum: Motor Technology
Topic: Bosch Perfomance Line Throttle Mod
Replies: 10
Views: 1526

Re: Bosch Perfomance Line Throttle Mod

Nastrovia!

viewtopic.php?t=96492
Are all the hall sensors 120* apart? Above thread is hall sensor layout on a bafang. Shouldn't they be in like a group?

Image
by leffex
Jan 13 2020 4:13pm
Forum: Motor Technology
Topic: Bosch Perfomance Line Throttle Mod
Replies: 10
Views: 1526

Re: Bosch Perfomance Line Throttle Mod

Good work Gazoo! You're kind of the first (at least) that I know of who have managed to do this! Awesome! I did use another controller on a bafang but it feelt jerky and I put down that project. One thought I had when I read about your story was that if you change highest voltage that the throttle i...
by leffex
Jan 13 2020 7:22am
Forum: Polls & Surveys
Topic: Which hybrid electric car will be yours in the future?
Replies: 10
Views: 931

Which hybrid electric car will be yours in the future?

For me it will be a hybrid plug-in. Sad I have no use of one right now. Chevrolet volt or the sister car that is the same Opel Ampera is something I'm looking at in the future.
by leffex
Jan 06 2020 3:11pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 381
Views: 37999

Re: Li-ion cells cycle ageing

. Nice charts I love them! Thanks alot for it! MJ1 so cool new cell that give you epic and long performance life. I'm stuck with my used PFs but it could be worse if I had used my used and old Sony V3 10A capable in my latest battery build, cells who have degraded down to only 1800-2100mah which wh...
by leffex
Dec 14 2019 2:34pm
Forum: Items Wanted
Topic: Job offer Sweden Gothenburg
Replies: 0
Views: 1628

Job offer Sweden Gothenburg

There is a chance of work for about 10 days in the midst of February up to the full month of February 2020. With possible for extension as part time for hours after that, average 1 day work per week or less until end of August 2020. From September 2020 there is more work available up to full time wo...
by leffex
Dec 14 2019 2:08pm
Forum: Items Wanted
Topic: looking for a job in Solar that isn't construction/install?
Replies: 2
Views: 856

Re: looking for a job in Solar that isn't construction/install?

Hey Nice job offer! We almost needed a guy at our ebike store but sales was doped 2018 and went down to 70% of what it for this year (2019 so maybe in the future. However I really would like to try working in solar in the future. Maybe I should just knock on some companies doors and have a chat and ...
by leffex
Dec 10 2019 9:08am
Forum: Large EV General Discussion
Topic: Ideas for EV farm machinery
Replies: 59
Views: 6658

Re: Ideas for EV farm machinery

Two ideas I got apart from starting small and then taking on the harder projects. (Free house energy first before doing it at work, or commuting to work for free) A portable tower / winch using electricity or grid by cable. Just move it sideways on one end of the field and drag out the cable and sta...
by leffex
Nov 30 2019 11:09am
Forum: Battery Technology
Topic: Resuscitating new Vtc6a from complete discharge
Replies: 7
Views: 962

Re: Resuscitating new Vtc6a from complete discharge

... Most of the packs measure around 3-4V per cell, with several packs around the 1V range and one pack that is dead flat. Like 0.04V per cell. Maybe the BMS ran it flat? ... Any suggestions welcome. The 3-4 volt ones are OK, good. But do really let go of the bad cells or use them as "learning" for...
by leffex
Nov 23 2019 4:07am
Forum: E-Bike Technical
Topic: Can someone explain this to me?
Replies: 15
Views: 1905

Re: Can someone explain this to me?

Check all wires and connectors. Try check the fuse in the battery. Most batteries have a bms that monitor power outtake and charging so that may be why it shut off after over-current protection set in in your full throttle up a hill episode. Usually this function will reset itself after a few second...