Search found 282 matches

by NickF23
Feb 21, 2018 5:32 pm
Forum: E-Bike General Discussion
Topic: Cheap high rate 24V pack?
Replies: 11
Views: 208

Re: Cheap high rate 24V pack?

Have you tried asking em3ev for a custom pack? They fit most of your criteria.
by NickF23
Jan 16, 2018 2:16 pm
Forum: Battery Technology
Topic: First Vruzend build.. voltage just short of 42v
Replies: 21
Views: 579

Re: First Vruzend build.. voltage just short of 42v

If you put the string back together with a lower voltage cell it will become back into balance with the rest, reducing the higher voltage cells. I'm not sure how long it would take.
by NickF23
Jan 16, 2018 1:15 pm
Forum: Battery Technology
Topic: First Vruzend build.. voltage just short of 42v
Replies: 21
Views: 579

Re: First Vruzend build.. voltage just short of 42v

From your latest results it seems that one cell in string 5 has a very bad connection or is disconnected from the rest of the pack. Thus all the rest of the cells in the string got more charge and therefore are a bit higher. It could also be a bad cell. I still suspect the bms killed the charge. Try...
by NickF23
Jan 15, 2018 7:50 pm
Forum: Battery Technology
Topic: First Vruzend build.. voltage just short of 42v
Replies: 21
Views: 579

Re: First Vruzend build.. voltage just short of 42v

Possible sequence of events that caused this. Poor connection in string one and two caused the bms to see higher voltage on string one and two and start burning off the excess charge. bms then trips the pack before the voltage on these strings goes too high causing the whole charge to terminate earl...
by NickF23
Jan 14, 2018 9:42 am
Forum: E-Bike Non-hub Motor Drives
Topic: Chain tensioner with Shimano Nexus 3 and BBSHD
Replies: 5
Views: 372

Re: Chain tensioner with Shimano Nexus 3 and BBSHD

I have a Sturmey-Archer tensioner that came with my Alfine 8. They do a series here with similar prices to the Shimano, so far it just works. http://www.sturmey-archer.com/en/products/chain-tensioners I've just ordered a chunkier 1/8 chain in the hopes that it will last longer than the 3/32 chains. ...
by NickF23
Jan 12, 2018 8:48 am
Forum: Items for Sale - New
Topic: DIY assembly kit for 18650 without spot welding/Soldering
Replies: 427
Views: 30650

Re: DIY assembly kit for 18650 without spot welding/Soldering

The existing kit is limited to 3.5a continuous per cell. This is fine for lower power ebikes like mine (500watt) and I'm going to try to build my own battery using this kit some time this year. I think the excitement has faded a little while people wait for v2 kit with higher discharge rates. I imag...
by NickF23
Jun 02, 2017 6:54 pm
Forum: General Discussion
Topic: Makita Power Tool Cell Amps?
Replies: 12
Views: 556

Re: Makita Power Tool Cell Amps?

No, just high quality Sony cells. The bms would mark the pack as damaged if a cell got over discharged. If you tried to charge the battery 3 times in a row it would permanently disable the battery via the bms. There was lots of complaints, batteries failing a few days out of warranty. Some people th...
by NickF23
Jun 02, 2017 3:54 pm
Forum: General Discussion
Topic: Makita Power Tool Cell Amps?
Replies: 12
Views: 556

Re: Makita Power Tool Cell Amps?

Thanks. I don't think thats a balancing bms. When the cells go to far out of balance it will mark the pack as broken and the charger will refuse to charge it. You might be able to add a balancing plug when you're wiring it up. That way you could bring to back into balance again with a lipo charger i...
by NickF23
Jun 02, 2017 11:31 am
Forum: General Discussion
Topic: Makita Power Tool Cell Amps?
Replies: 12
Views: 556

Re: Makita Power Tool Cell Amps?

I'd be interested to find out what BMS you are using. I looked into doing the same thing but could not find a balancing bms, so I just bought a normal makita battery. The last few I bought where replicas with Samsung cells. They were OK but went out of balance especially when heavily discharged.
by NickF23
Jun 02, 2017 9:19 am
Forum: General Discussion
Topic: Makita Power Tool Cell Amps?
Replies: 12
Views: 556

Re: Makita Power Tool Cell Amps?

unless you've got a balancing bms for it use new sony vt series batteries. Lots of replica batteries use samsung and others but they go out of balance and mostly die within a year, i've tried balancing them manually but they go out of balance again within a few cycles so a waste of time.
by NickF23
May 06, 2017 5:13 pm
Forum: E-Bike Technical
Topic: Ebike motor/battery compatibility question PLEASE HELP
Replies: 13
Views: 840

Re: Ebike motor/battery compatibility question PLEASE HELP

can't see from the pictures. The product number you give is for the display not the controller. You could just buy 4 anderson powerpoles and crimp them or sodder them on yourself on both the battery and controller side.
by NickF23
May 06, 2017 2:43 pm
Forum: E-Bike Technical
Topic: Good Value e-Bike Conversion Kit? This is what I found...
Replies: 8
Views: 767

Re: Good Value e-Bike Conversion Kit? This is what I found..

Don't buy a li-ion battery from an unknown source. Not only might it catch fire, it also might be unreliable. 3 options are 1: Buy from a vendor with a reputation for safety preferably from your home country ( so you can sue their public liability insurance if your house burns but you're uninsured) ...
by NickF23
May 28, 2012 5:42 pm
Forum: Items for Sale - Used
Topic: Puma motor with crystalyte controller plus bits - UK
Replies: 3
Views: 407

Re: Puma motor with crystalyte controller plus bits - UK

Looks like everything is sold. I'll update if this changes. Was sold to the first people to PM.Thanks for all the enquiries from everyone.
by NickF23
May 26, 2012 4:50 pm
Forum: Items for Sale - Used
Topic: Puma motor with crystalyte controller plus bits - UK
Replies: 3
Views: 407

Puma motor with crystalyte controller plus bits - UK

SOLD 2012-05-26 22.29.49.jpg Clearing out a few bits. Puma motor, early wide version, with thick phases. 7 speed cassette, not easy to fit disc break. Comes with crystalyte 35 amp 48 volt max controller. 25mph at 48 volts, happy at 1500 watts. comes with 1/2 twist throttle, controller is waterproofe...
by NickF23
Feb 11, 2012 9:39 am
Forum: Large EV General Discussion
Topic: Nissan Leaf Battery Life
Replies: 15
Views: 2740

Re: Nissan Leaf Battery Life

Its very hard to work out cycle life for any of the batteries used in EV's unless you at least see the spec sheet and all the discharge and charge data and temperatures etc Its innaccurate to estimate based on the chemistry because it may very a lot between batteries for example in NMC how much cobl...
by NickF23
Feb 11, 2012 8:25 am
Forum: Alternative Energy
Topic: Stirling Combined Heat & Power Plant available in Britian
Replies: 15
Views: 3728

Re: Stirling Combined Heat & Power Plant available in Britia

No worries Bigmoose,I love Stirling engines, though I've never a working engine apart from toys. I imagine if everyone had one as a boiler we could get rid of a lot of power stations. It looks like its eligible for a feed tariff of 10 pence/KWH in the UK (normal supply price is 12-14 pence) http://w...
by NickF23
Oct 23, 2011 4:53 pm
Forum: General Discussion
Topic: Pazzis? Extreme Food For Thought
Replies: 2
Views: 268

Re: Pazzis? Extreme Food For Thought

A great watch, thanks for that
by NickF23
Oct 22, 2011 4:33 pm
Forum: Electric Watercraft
Topic: Powerboard
Replies: 7
Views: 2288

Re: Powerboard

If its 2 stroke then its going to be banned in much of Europe. An electric version would be better much less noise though also less run time.
by NickF23
Aug 31, 2011 3:16 pm
Forum: General Discussion
Topic: This man may change the world Andrea Rossi & eCat
Replies: 345
Views: 21445

Re: This man may change the world Andrea Rossi & eCat

If it works then why the secrecy? Why not release design to everyone and let people repeat his success. It doesn't even matter if current scientific theory can explain the device or not because if it works people will build lots of them and theoretical scientists will have to work overtime to try to...
by NickF23
Aug 29, 2011 7:51 pm
Forum: E-Vehicles General Discussion
Topic: cheap and cheerful power powabyke
Replies: 5
Views: 1111

Re: cheap and cheerful power powabyke

e can i see any improvements from advancing the brushes on the commutator whilst i am fitting them ? . If I remember right I just got lots more heat! and maybe a bit more speed. The motors aren't very well made for faster than than spec. I used to run mine at 35 amps 48 volts which was 20 mph and g...
by NickF23
Aug 22, 2011 3:40 pm
Forum: E-Bike General Discussion
Topic: Prepaid phone with GPS as theft recovery device
Replies: 7
Views: 754

Re: Prepaid phone with GPS as theft recovery device

I was going to do this about 3 years ago with a gsm only phone. When I tested out the mapping software it was only accurate to within a mile, so basically useless in the city where I live. With GPS plus GSM which is what most new smartphones use, it should work much better, but GPS generally needs l...