Search found 89 matches

by Jan-Erik-86
Jan 06 2020 5:16am
Forum: E-Bike Technical
Topic: Push Button Throttle
Replies: 19
Views: 636

Re: Push Button Throttle

Hi, and welcome to the forum! What bike or controller du you have? By push button, do you mean a simple on/off switch that switch from no power to full power, or do you want like a thumb swith where you can adjust the power? Both are usually simple to connect if your controller support a throttle, b...
by Jan-Erik-86
Dec 17 2019 7:15am
Forum: Battery Technology
Topic: Lithium battery question
Replies: 77
Views: 2929

Re: Lithium battery question

What kind of motor do you have? Normally a motor for this kind of use is a 3 phase motor, and connecting a battery directly to any of the phases will only lead to a quickly fried motor, not a spinning motor.
by Jan-Erik-86
Nov 25 2019 8:59am
Forum: E-Bike General Discussion
Topic: Winter riding and keeping battery warm
Replies: 6
Views: 1058

Re: Winter riding and keeping battery warm

I have a thin layer of insulation around my battery pack inside the hard-case, and it seems to keep the temperature quite well while in use. I tested it a couple of weeks ago when it was -9c outside. Starting temp was around +18c, and after a 35 minute ride the battery temp had only dropped around 2...
by Jan-Erik-86
Nov 20 2019 6:21am
Forum: Battery Technology
Topic: Acceptable Battery Sag
Replies: 24
Views: 1941

Re: Acceptable Battery Sag

R1112 is just the date code, meaning march 2013. The actuall modell number should also be written on it, but its not easy to read the text on Sanyo cells...
by Jan-Erik-86
Nov 20 2019 3:17am
Forum: Battery Technology
Topic: Acceptable Battery Sag
Replies: 24
Views: 1941

Re: Acceptable Battery Sag

You don't tell exactly which cell it is, but by the specs it looks like it's Sanyo UR18650A? Since these are used cells, did you test each cell for capacity, DCIR, and self discharge before putting them together? I'd charge full and check that all are at 4.2V, then discharge and check again if all c...
by Jan-Erik-86
Nov 14 2019 6:31am
Forum: Battery Technology
Topic: Acceptable Battery Sag
Replies: 24
Views: 1941

Re: Acceptable Battery Sag

I'd say 3V is normal, but it all depends on what cells you're using, what wires, what connectors, and most of all how much power you're pulling from it. As for balancing, there are basically 3 ways: 1, best) Use a programmable BMS and set it to balance at lower voltage. Also set overcharge voltage t...
by Jan-Erik-86
Nov 13 2019 3:33pm
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 13488

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

Yes, but where it is only two bus bars i've made them at least double. No connections got hot during load test (constant ~2000W load over some time).
by Jan-Erik-86
Nov 13 2019 1:24pm
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 13488

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

Erik possibly decided to break his Vruzend DIY into two Vruzend packs with one 4P14S up front in the frame and a 3P14S cojoined on a rack above the rear wheel? Would be helpful if Erik uploads a photo once he's satisfied with final situaton. I went with a triangular battery that fit inside the fram...
by Jan-Erik-86
Nov 10 2019 12:45pm
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 13488

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

I suppose you could, but they do not appear as common and easy to get for a 48-52V system as for a 12V system. Is there anything i'm not seeing that would make my option not work just as well with the only two disadvantages being a bit lower efficiency and an additional small box (the one i found is...
by Jan-Erik-86
Nov 09 2019 3:36pm
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 13488

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

I see some of you recommend NCR, and some say forget the GA, so i'm a bit confused.. What about NCA or is that too mild-mannered? How close are you to narrowing your choice down to your final selection? I'm not sure if i understand what you're asking? My confusion was due to people recommending NCR...
by Jan-Erik-86
Nov 09 2019 7:43am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 344
Views: 31070

Re: Li-ion cells cycle ageing

So maybe to give MJ1 the benefit of doubt and another chance need to test it again (just a suggestion). He was talking about the MG1, not MJ1. These are two very different cells and must not be mixed up. MJ1 have already been tested and turned out to be a very good cell. From what i understood, the...
by Jan-Erik-86
Nov 08 2019 1:46am
Forum: E-Bike Technical
Topic: KT-LCD3 missing regen settings (C13), but still have regen trough PAS, but only under some conditions?
Replies: 2
Views: 327

Re: KT-LCD3 missing regen settings (C13), but still have regen trough PAS, but only under some conditions?

Yes, it will limit to the set speed limit. I gave it another try today down the steepest hill on my route (around 10%, but very short hill) and set limit to 25 km/h. While pedaling downhill (just moving them around, not applying any force) it kept breaking, but wasn't able to hold it at 25 though, i...
by Jan-Erik-86
Nov 07 2019 9:30am
Forum: E-Bike Technical
Topic: KT-LCD3 missing regen settings (C13), but still have regen trough PAS, but only under some conditions?
Replies: 2
Views: 327

KT-LCD3 missing regen settings (C13), but still have regen trough PAS, but only under some conditions?

I previously tried to set up regen on my LCD3, but after some searching found out that it does not appear to have support regen as the ealier LCD3 versions does not have the C13 setting (ABS braking strength), so i gave up on it. After putting on studded tires two days ago, i also lowered the speed ...
by Jan-Erik-86
Nov 05 2019 7:35am
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 13488

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

I allready have two seat heater pads ready to install on my battery. I was planning on using a digital thermostat instead though, and was thinking of inserting them between the battery and the insulation instead of between the battery case and insolation. Haven't decided to use one or two yet though...
by Jan-Erik-86
Nov 05 2019 1:35am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 344
Views: 31070

Re: Li-ion cells cycle ageing

If you are looking for hard numbers and simple easy to follow "rules", fine. But reality is greyscale and complex. Got it, thanks! My unwanted remarks Your remarks are not unwanted at all. :) OK, as 30Q is also very popular at the opposite side of the planet, it is next cell to test. :) I'm looking...
by Jan-Erik-86
Nov 04 2019 5:03pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 344
Views: 31070

Re: Li-ion cells cycle ageing

Citation from „Extending Battery Lifetime by Avoiding High SOC“ : Thank you again very much for taking your time to both dig out, post and explain all these stuff. This thread was already good to begin with, but is now pure gold thanks to people like you. :) I'm sorry if i dragged it a bit off topi...
by Jan-Erik-86
Nov 04 2019 3:01am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 344
Views: 31070

Re: Li-ion cells cycle ageing

Thank you very much for the links and voltage SoC chart for different cells, i found it very useful. :) I'm unable to charge at work, but I have a lot of reserve capacity and will lower my charge voltage a bit more. I understand my question may be speculative and theoretical, but I can't be the only...
by Jan-Erik-86
Nov 03 2019 5:48pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 344
Views: 31070

Re: Li-ion cells cycle ageing

It's not really about having a timer on it or not for me, it's more because i don't completely trust the safety of charging li-ion cells unattended. Surely it goes well in 99.9% of the cases, but after reading what happened to dogman dan for example, I simply don't want to take that chance as long a...
by Jan-Erik-86
Nov 03 2019 3:45pm
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 344
Views: 31070

Re: Li-ion cells cycle ageing

Thank you very much for publishing your results, it's for sure been very helpful and interesting for me, and I'm sure it is (and will be) for many others as well for years to come! :) I'm really looking forward to seeing how they compare after more cycles, both in terms of DCIR and capacity loss. Th...
by Jan-Erik-86
Oct 29 2019 12:53pm
Forum: E-Bike General Discussion
Topic: Bosch Battery Charging off bike
Replies: 2
Views: 498

Re: Bosch Battery Charging off bike

That's odd. I'm not familiar with your bike, but after reading on trekbikes.com it say the following about the Super Commuter+ S8: It's equipped with a long-lasting Bosch PowerPack 500 battery that's easy to remove for charging at any household outlet Followed by: The battery is super-secure while r...
by Jan-Erik-86
Oct 29 2019 5:28am
Forum: Battery Technology
Topic: New 14s battery pack, US18650VTC6 vs NCR18650GA
Replies: 190
Views: 13488

Re: New 14s battery pack, US18650VTC6 vs NCR18650GA

Thank you very much for the update on this thread guys! :) It seems the M36 was indeed a much better choice then the PF. Not only does the capacity loss more or less stall after ~50 cycles on the M36 (at least in coimparison with the PF), but also the DCIR increase appears to have stalled after ~150...
by Jan-Erik-86
Oct 28 2019 4:46am
Forum: E-Bike General Discussion
Topic: Is this normal for a BMS to do?
Replies: 4
Views: 466

Re: Is this normal for a BMS to do?

If it reads 84V before the BMS and 81V after, is it possible the BMS simply disconnected the charger to prevent overcharge, and the 81V measurement would instantly change once you connect a load to it? Did you try to connect a load to the battery to see what happened? I don't think a BMS should norm...
by Jan-Erik-86
Oct 27 2019 9:18am
Forum: E-Bike Technical
Topic: Low voltage problem
Replies: 5
Views: 621

Re: Low voltage problem

What battery are you using, and what controller? Also, is that 5-10 minutes of riding, or does it simply drop down to empty by itself? Since it's happening with two batteries one would suspect something else to be the issue, but to drain a decent sized battery in 5-10 minutes would usually require s...
by Jan-Erik-86
Oct 23 2019 4:15am
Forum: E-Bike Technical
Topic: Confusing battery info
Replies: 9
Views: 833

Re: Confusing battery info

The 54,6V voltage is just the fully charged voltage, so it will work for your system just fine. However, the best you can get from a 3P pack IF it were with Panasonic/Samsung/Sanyo 18650 cells, would be around 10,5Ah, not 18Ah. The fact that they clearly lied about the cells means it's probably not ...
by Jan-Erik-86
Oct 23 2019 2:30am
Forum: Battery Technology
Topic: Repairing a Broken Battery Pack
Replies: 5
Views: 444

Re: Repairing a Broken Battery Pack

If the cells still measure fine individually id probably just reconnect them as is after charging them to an identical voltage. I cant see why this would cause any issues with bms and balance lead still connected, but then again im not familiar with your bms. My thought is, if that would cause an is...