Search found 142 matches

by zeccato
Apr 07 2020 9:26am
Forum: E-Bike General Discussion
Topic: a speed electric bike, looking something with a big battery
Replies: 14
Views: 231

Re: a speed electric bike, looking something with a big battery

Not always a fast bike costs a lot (I'm light), with a full folding (2011), and from 2012 45-50km/h, also battery (from 2012) 14kg.

(I had to learn and do things myself).
by zeccato
Apr 06 2020 3:07pm
Forum: E-Bike General Discussion
Topic: a speed electric bike, looking something with a big battery
Replies: 14
Views: 231

Re: a speed electric bike, looking something with a big battery

I quote the recommended calculations above.

I have 1500W battery and I do maximum 60km, you have to calculate even a 20% unused (1500W= 1300W).

I recommend placing the battery under the center forward.
by zeccato
Mar 28 2020 3:40am
Forum: Battery Technology
Topic: 48v 13s4p 18650 showing 0v for 12th cell group
Replies: 5
Views: 402

Re: 48v 13s4p 18650 showing 0v for 12th cell group

I'd load the 12 individually a few seconds or minutes to see what it does.
if that's all you got, maybe a 5v mobile phone charger. Careful not to exceed 4.2v.
So you can see that the bms isn't faulty.
load in a safe place to avoid fire.
by zeccato
Mar 26 2020 2:50am
Forum: E-Bike Non-hub Motor Drives
Topic: Power issue and crackling noise
Replies: 16
Views: 373

Re: Power issue and crackling noise

Thanks for the advice. Maybe next time reduce the levels of sarcasm. Not all people find that acceptable. Helping minus the sarcasm would be great and be a much more positive step towards people's communication with you. I have found better help on this subject from other forums with more professio...
by zeccato
Mar 25 2020 9:39am
Forum: General Discussion
Topic: If I don't log in, some topics don't show up, why?
Replies: 10
Views: 270

Re: If I don't log in, some topics don't show up, why?

spinningmagnets wrote:
Mar 25 2020 9:10am
Some sections and topics are only available to read for members who are signed-in.
thank you, out of curiosity: has this been changed recently?
by zeccato
Mar 22 2020 1:17pm
Forum: Battery Technology
Topic: Help me troubleshoot this pack please. How are these voltages?
Replies: 50
Views: 831

Re: Help me troubleshoot this pack please. How are these voltages?

eikido wrote:
Mar 22 2020 3:25am
I think that after 3 or 4 unloaded charges it will normalize, if charged up to at least 4v is fine, the difference is minimal.
In my opinion, I wouldn't do anything,
just sometimes the balance.
You use it for ebike?
by zeccato
Mar 22 2020 11:32am
Forum: Battery Technology
Topic: Help me troubleshoot this pack please. How are these voltages?
Replies: 50
Views: 831

Re: Help me troubleshoot this pack please. How are these voltages?

eikido wrote:
Mar 22 2020 3:25am
Does the battery do less miles (km) than before?
by zeccato
Mar 21 2020 4:01pm
Forum: Items for Sale - New
Topic: Nucular electronics - complete kit for ev! [beta]
Replies: 1250
Views: 129330

Re: Nucular electronics - complete kit for ev! [beta]

Interesting, but what about me?😋
How is the FW (120% for 55km/h) with 6f, on Mac T8, in wheel 22, 16s Lfp?
(Battery is ok, me and the bike are light, now 45km/h).
Efficient enough?
No problem for the hub?
by zeccato
Mar 21 2020 1:57am
Forum: E-Bike Technical
Topic: Will higher amp controller help?
Replies: 31
Views: 909

Re: Will higher amp controller help?

Fine, I've found that lfp resist abuse well,
More tests video etc.:
https://electrotransport.ru/ussr/index. ... 0350.0;all
by zeccato
Mar 20 2020 10:15am
Forum: Battery Technology
Topic: Help me troubleshoot this pack please. How are these voltages?
Replies: 50
Views: 831

Re: Help me troubleshoot this pack please. How are these voltages?

I'd measure all the 13s while he's charging, to see the highest, or how far they go...
by zeccato
Mar 19 2020 1:40am
Forum: E-Bike Technical
Topic: Will higher amp controller help?
Replies: 31
Views: 909

Re: Will higher amp controller help?

In my opinion: you should double or triple the parallel, then either fatten the shunt, or better yet buy a programmable controller (24-72v. 40ah).
by zeccato
Mar 18 2020 9:24am
Forum: Battery Technology
Topic: Test a battery pack. How can i easily create a high amp load?
Replies: 15
Views: 802

Re: Test a battery pack. How can i easily create a high amp load?

If you have a balancer charger, while you load one you unload the other, (checking imput).
by zeccato
Mar 17 2020 7:45am
Forum: E-Bike Technical
Topic: XPD: open-source keywin e-bike lab replacement
Replies: 603
Views: 157356

Re: XPD: open-source keywin e-bike lab replacement

Thanks for your contribution, today I installed xpd, that is the 3 programs (as specified) and it worked well with window 10. I put the defaut on the 2, 100%, and the 3 position switch on the 2. my 2018 cable usb already had the bridge, (EB3 12 FET cellman). I've made some adjustments, nothing else....
by zeccato
Mar 15 2020 9:59am
Forum: Battery Technology
Topic: LIFEPo4 cells, 21700 3000mah, recommendations?
Replies: 7
Views: 324

Re: LIFEPo4 cells, 21700 3000mah, recommendations?

thanks for the clarification, I'll think about it, for now I'm not buying anything, because I'm undecided on the best choice to make.
by zeccato
Mar 15 2020 9:04am
Forum: Battery Technology
Topic: LIFEPo4 cells, 21700 3000mah, recommendations?
Replies: 7
Views: 324

Re: LIFEPo4 cells, 21700 3000mah, recommendations?

The problem is, you are accepting numbers from marketing materials that are likely bogus. Reducing weight with **quality** cells - I assume longevity is important to you? means reducing either voltage or Ah range, if you stick to LFP. Otherwise go to the much higher density LI chemistries like NCA ...
by zeccato
Mar 15 2020 1:56am
Forum: Battery Technology
Topic: LIFEPo4 cells, 21700 3000mah, recommendations?
Replies: 7
Views: 324

Re: LIFEPo4 cells, 21700 3000mah, recommendations?

Tanks, I calculated that the 18650 1800mah to make 27ah have about the same weight. So the 3000mah are no longer light. p.s I have A123 26650 2500mah 16s 3p for the city, but for a big 27ah package I would like something lighter. To do about 27ah: 144 cells 21700 3000mah 68g) = 9792kg, 176 cells 266...
by zeccato
Mar 14 2020 3:38am
Forum: Battery Technology
Topic: LIFEPo4 cells, 21700 3000mah, recommendations?
Replies: 7
Views: 324

LIFEPo4 cells, 21700 3000mah, recommendations?

I'm looking at these cells: https://m.made-in-china.com/company-lithiumionbattery/ LIFEPo4 cells 21700 3000mah (68g.), to make a package from 48v 27Ah, and that would be about 10 kg. to go lighter than the bigger (26650 85g.). (cells of 18650 with 2,500-3000mah I can't find LIFEPo4). recommendations...
by zeccato
Mar 13 2020 4:36am
Forum: General Discussion
Topic: Re: Lithium battery manufacturer question
Replies: 11
Views: 1268

Re: Lithium battery manufacturer question

markz wrote:
Mar 12 2020 9:55pm
Don't bother with LiFePO4 as they are too big & too heavy compared to regular 18650's.
I pedal symbolically, so (it doesn't affect) I don't have a big weight problem.
by zeccato
Mar 13 2020 3:11am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 381
Views: 38011

Re: Li-ion cells cycle ageing

Replies from another forum (translated): But it's true that a 36V 10Ah loses something every year, and after three or four years you have to change it, but it's also true that if you make a 25Ah battery it will last long enough since it's not used like the classic 10Ah batteries. If you want to have...
by zeccato
Mar 12 2020 1:47pm
Forum: General Discussion
Topic: Re: Lithium battery manufacturer question
Replies: 11
Views: 1268

Re: Lithium battery manufacturer question

Has anybody ever heard of or used batteries from Qinhuangdao Xinchi Photoelectricity Technology Co.,Ltd.? https://m.made-in-china.com/company-lithiumionbattery/ I'm looking at these cells with interest: lifepo4 cells 21700 3000mah (68g.), to make a package from 48v 27Ah, and that would be about 10 k...
by zeccato
Mar 12 2020 10:30am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 381
Views: 38011

Re: Li-ion cells cycle ageing

Sorry about the translation but I didn't understand: IRL 500 cycles is a lot. I don't need specifically, more or less. 100 cycles per year. I'll discharge the battery at 1c, and i charge it at 0.5c., winter temperature + 10-15  °C, summer +30-35  °C, theoretically how many years will they last? or h...
by zeccato
Mar 12 2020 7:10am
Forum: Battery Technology
Topic: Li-ion cells cycle ageing
Replies: 381
Views: 38011

Re: Li-ion cells cycle ageing

N................ If I were to take as an example: (LG INR21700-M50T 5000mAh - 7.3A) or (Samsung INR21700-50E 5000mAh - 10A) to make a battery of 15s 35Ah, and i use them with maximum discharge 1c, and charge 0.5c, 2 cycles per week, with winter temperature + 10-15  °C, and in summer +30-35  °C, th...
by zeccato
Mar 12 2020 6:23am
Forum: Motor Technology
Topic: Favourite hall connector - recommendations
Replies: 28
Views: 835

Re: Favourite hall connector - recommendations

good, but not for me because when I have to modify the programmable controller, I have to disconnect them.