Search found 287 matches

by NickF23
Aug 16 2019 10:12am
Forum: Battery Technology
Topic: BMS for a 20s NiMH 9000mAh pack, GP 900 DHC cells.
Replies: 4
Views: 197

Re: BMS for a 20s NiMH 9000mAh pack, GP 900 DHC cells.

Your controller should prevent overdischarge of the string by cutting out at 20 volts or around that. This doesn't protect individual cells but if you have a bad cell you can replace it. This isn't such a serious situation as with lithium, if you overdischarge a lithium cell it becomes a fire risk.
by NickF23
Aug 16 2019 10:06am
Forum: Battery Technology
Topic: BMS for a 20s NiMH 9000mAh pack, GP 900 DHC cells.
Replies: 4
Views: 197

Re: BMS for a 20s NiMH 9000mAh pack, GP 900 DHC cells.

NIMH batteries don't need the kind of battery management systems that lithium batteries use. NIMH are designed to be overcharged which allows a series string to be balanced on charge. Typically a charger will connect to a thermistor (or a few thermistors) inside the pack which will help terminate ch...
by NickF23
Jun 17 2019 2:48pm
Forum: Items for Sale - Used
Topic: Kalkhoff 2008 w/ Panasonic motor (non-working)
Replies: 2
Views: 316

Re: Kalkhoff 2008 w/ Panasonic motor (non-working)

In case your not familiar with the bike it's a power assist with a torque sensor so the motor won't do anything unless you're out on the bike pedalling.
by NickF23
May 14 2019 4:22pm
Forum: Battery Technology
Topic: PANASONIC ebike battery change
Replies: 49
Views: 9792

Re: PANASONIC ebike battery change

Not all Panasonic drive ebikes go into emergency mode. You can test to see if yours will by covering up the data pins with tape and trying to cycle on a fully charged battery.

http://www.flecc.uk/p/li_battery.html to see which pins
by NickF23
Apr 22 2019 5:11pm
Forum: Battery Technology
Topic: Lead acid anyone?
Replies: 51
Views: 2664

Re: Lead acid anyone?

Sealed lead acid batteries are great for mobility / disability scooters. That's because the extra weight is an advantage. By putting the heavy SLA batteries low in the scooter it lowers the centre of gravity and stops the scooter falling over and injuring the rider. Range isn't an issue either 24v 5...
by NickF23
Apr 10 2019 7:08pm
Forum: Battery Technology
Topic: Li-ion battery charger suggestion
Replies: 30
Views: 1156

Re: Li-ion battery charger suggestion

There seems to be an infinite number of meanwell led driver psu models, all with different specs. Here's a thread on 2 types that have a variable output range that could charge both 36 and 48v batteries. https://www.endless-sphere.com/forums/viewtopic.php?t=92316 I have an HLG 150 watt model and its...
by NickF23
Mar 22 2019 11:34am
Forum: E-Bike Technical
Topic: 84V 3A Charger for Li-ion Battery?
Replies: 1
Views: 162

Re: 84V 3A Charger for Li-ion Battery?

you should be able to find an meanwell power supply for most voltages. Here's one but at around 1.7 amps is a bit less than you wanted. There's probably more but you have to search https://www.mouser.co.uk/ProductDetail/MEAN-WELL/ELG-100-C1050B?qs=sGAEpiMZZMvV8Y9YugmIgqWA%2FF1iXuxjo9Xbm7eRkwtDCWNBNe...
by NickF23
Nov 25 2018 10:08pm
Forum: E-Bike General Discussion
Topic: Battery Fire.
Replies: 39
Views: 2632

Re: Battery Fire.

I think Tesla cells are more dangerous than other 18650 cells because they don't have ptc or thermal cutout, this doesn't matter when they are in a module with fuses, bms and cooling system, but when removed they are at least as dangerous as lipo and should be handled with due respect. https://batte...
by NickF23
Mar 10 2018 10:10am
Forum: Items for Sale - New
Topic: SOLD Kepler Drive unused ( UK - South)
Replies: 4
Views: 601

Re: Kepler Drive unused ( UK - South)

Signed delivery to America/Australia and Europe is 14 USD.

Chilltrout has not replied to my messages yet so the drive is still available.
by NickF23
Mar 04 2018 7:33am
Forum: Items for Sale - New
Topic: SOLD Kepler Drive unused ( UK - South)
Replies: 4
Views: 601

SOLD Kepler Drive unused ( UK - South)

I bought this awesome bit of kit in April 2017, but I have too many projects on at the moment and not enough funds :( It's as it was the day it was sent to me. The price is 110 USD. The cost new was 100 dollars, but there is an additional $10 Brexit surcharge because the British pound collapsed in v...
by NickF23
Feb 21 2018 5:32pm
Forum: E-Bike General Discussion
Topic: Cheap high rate 24V pack?
Replies: 11
Views: 865

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 2:16pm
Forum: Battery Technology
Topic: First Vruzend build.. voltage just short of 42v
Replies: 21
Views: 1802

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 1:15pm
Forum: Battery Technology
Topic: First Vruzend build.. voltage just short of 42v
Replies: 21
Views: 1802

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 7:50pm
Forum: Battery Technology
Topic: First Vruzend build.. voltage just short of 42v
Replies: 21
Views: 1802

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 9:42am
Forum: E-Bike Non-hub Motor Drives
Topic: Chain tensioner with Shimano Nexus 3 and BBSHD
Replies: 5
Views: 1237

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 8:48am
Forum: Items for Sale - New
Topic: DIY assembly kit for 18650 without spot welding/Soldering
Replies: 495
Views: 69505

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 6:54pm
Forum: General Discussion
Topic: Makita Power Tool Cell Amps?
Replies: 12
Views: 1060

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 3:54pm
Forum: General Discussion
Topic: Makita Power Tool Cell Amps?
Replies: 12
Views: 1060

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 11:31am
Forum: General Discussion
Topic: Makita Power Tool Cell Amps?
Replies: 12
Views: 1060

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 9:19am
Forum: General Discussion
Topic: Makita Power Tool Cell Amps?
Replies: 12
Views: 1060

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 5:13pm
Forum: E-Bike Technical
Topic: Ebike motor/battery compatibility question PLEASE HELP
Replies: 13
Views: 1488

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 2:43pm
Forum: E-Bike Technical
Topic: Good Value e-Bike Conversion Kit? This is what I found...
Replies: 8
Views: 1333

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) ...