Search found 41 matches

by DjSpaceGhost
Jan 20 2020 11:22pm
Forum: Battery Technology
Topic: Trouble balancing battery
Replies: 29
Views: 1837

Re: Trouble balancing battery

Some people would use such a profile hold 4.1Vpc until trailing amps drop to zero as a benchmark standard prior to running a timed CC Load cap test. But only once a year, or every 100 cycles, not frequently. I would caution to just try not do make it a habit. Fact is you really won't be giving up m...
by DjSpaceGhost
Jan 20 2020 3:03am
Forum: Battery Technology
Topic: Trouble balancing battery
Replies: 29
Views: 1837

Re: Trouble balancing battery

What I don't understand 0 amps if you're doing constant voltage CV at 0 amps as long as you haven't got older your voltage is fine. I was using an LED driver to charge it . It was set at 57.6v (14s) @570 mA per cell(total 4A) , where I would normally terminate when it reached 50mA , but I got busy ...
by DjSpaceGhost
Jan 19 2020 2:50pm
Forum: Battery Technology
Topic: Trouble balancing battery
Replies: 29
Views: 1837

Re: Trouble balancing battery

I recently bulk charged my pack to 4.1 , but got distracted and let it get down to 0 amps for about 2 hours. Is it likely that damage was done?
by DjSpaceGhost
Jul 26 2019 7:15pm
Forum: Battery Technology
Topic: Looking at building a new pack with Samsung 50E
Replies: 35
Views: 3173

Re: Looking at building a new pack with Samsung 50E

At a constant 30 ° C , the cycle life can drop up to around 20% vs a constant 20°C , but ambient temperature in a lot of places can stay at that level for long stretches of time, so I wouldn't stress over it. If it gets to say, 45°C, I'd take a break for a while if possible.
by DjSpaceGhost
Jun 04 2019 1:03pm
Forum: Battery Technology
Topic: buying Yuasa LEV50 & LEV40 Modules
Replies: 3
Views: 380

Re: buying Yuasa LEV50 & LEV40 Modules

They make some of the best AGM batteries available so I would trust their quality control over most comapanies. The price is a tad steep for repurposed cells, but they test each cell to make sure it has advertised capacity. I'd buy their used stuff before anybody's "new" cells off ebay/alibaba/ali e...
by DjSpaceGhost
Jun 03 2019 11:34am
Forum: Battery Technology
Topic: Would 30 Headway 38120 cells be enough?
Replies: 13
Views: 902

Re: Would 30 Headway 38120 cells be enough?

I feel that I have to mention that this not the best price to Wh battery you can buy. Cheaper US-based LFP sources would be greatly appreciated, especially for new. Not asking for discussion about other chemistries. That's the only reason I don't use LiFe . I haven't found a US vendor that's trustw...
by DjSpaceGhost
Jun 03 2019 11:20am
Forum: Battery Technology
Topic: Would 30 Headway 38120 cells be enough?
Replies: 13
Views: 902

Re: Would 30 Headway 38120 cells be enough?

999zip999 wrote:
Jun 03 2019 10:32am
200 amp cell I don't believe it
Have you ever seen one of these cells up close? It's believeable just due to the size of those things.
by DjSpaceGhost
Jun 02 2019 1:42pm
Forum: Stand-up E-scooters and E-skateboards
Topic: Offroad Scooter recommendations?
Replies: 22
Views: 2001

Re: Offroad Scooter recommendations?

PMSL have you riden a fast scooter around 50 mph in traffic ? I have trust me bikes are by far more agile and safer take this from an idiot that still rides them but I know the limit that's why I use a bike. To get 200mm suspension travel on a scooter means I stand around 8 1/2foot tall if im 6 foo...
by DjSpaceGhost
Jun 02 2019 2:33am
Forum: Stand-up E-scooters and E-skateboards
Topic: Offroad Scooter recommendations?
Replies: 22
Views: 2001

Re: Offroad Scooter recommendations?

Seen it, lovely ride to get around on but I wouldnt be jumping it through a rythem section on a downhill track anytime soon Well it's not really the intended use of the OP now, is it? He's just looking for a scooter for his GF to do some light off road on unpaved roads, not riding down the cliffs o...
by DjSpaceGhost
Jun 02 2019 2:17am
Forum: Stand-up E-scooters and E-skateboards
Topic: 10kW stand-up scooter with air suspension
Replies: 228
Views: 53036

Re: 10kW stand-up scooter with air suspension

It's very humbling to come across people that have the talent and skill I've witnessed on this forum. It's a gross understatement to say you're a very talented human being. This is like the civilain 2 wheeled Mars Rover .
by DjSpaceGhost
May 28 2019 10:26pm
Forum: Battery Technology
Topic: Panny or Sanyo?
Replies: 44
Views: 2287

Re: Panny or Sanyo?

That was a fantastic and simple explanation. :thumb:
by DjSpaceGhost
May 23 2019 1:45am
Forum: Battery Technology
Topic: matching power supply with DC charger
Replies: 3
Views: 266

Re: matching power supply with DC charger

What I was looking at is in fact 24v , but only 5amps max, I think . Thank you for that explanation. You saved me from buying some junk that would have been a waste of money.
by DjSpaceGhost
May 22 2019 11:20pm
Forum: Battery Technology
Topic: matching power supply with DC charger
Replies: 3
Views: 266

matching power supply with DC charger

This is probably an idiotic question.. but when using a dc balance charger that requires an ac power source, does the AC power source have to match the DC chargers output current/wattage ? For example : a 600watt 25amp max balance charger - Does the AC power source also have to be capable of supplyi...
by DjSpaceGhost
May 16 2019 8:11pm
Forum: Battery Technology
Topic: Panasonic/Sanyo NCR20700B vs Samsung INR21700-50E
Replies: 65
Views: 4194

Re: Panasonic/Sanyo NCR20700B vs Samsung INR21700-50E

Samsung claims 2k cycles from the 33J @ 4.1 -->3v . Is that total bull? https://secondlifestorage.com/t-Samsung-33J-a-21700-Li-ion-battery-designed-for-Tesla Well this cell is supposed to have 2k cycles at that voltage and STILL have the 3200+ mAH . It was designed for Tesla's newest PowerWall supp...
by DjSpaceGhost
May 16 2019 5:41pm
Forum: Battery Technology
Topic: Panasonic/Sanyo NCR20700B vs Samsung INR21700-50E
Replies: 65
Views: 4194

Re: Panasonic/Sanyo NCR20700B vs Samsung INR21700-50E

Samsung claims 2k cycles from the 33J @ 4.1 -->3v . Is that total bull? https://www.imrbatteries.com/samsung-33j-21700-3270mah-3-2a-battery/ On paper they seem to be touting it as 29E's big brother. https://secondlifestorage.com/t-Samsung-33J-a-21700-Li-ion-battery-designed-for-Tesla Usually those ...
by DjSpaceGhost
May 16 2019 1:40pm
Forum: Battery Technology
Topic: Panasonic/Sanyo NCR20700B vs Samsung INR21700-50E
Replies: 65
Views: 4194

Re: Panasonic/Sanyo NCR20700B vs Samsung INR21700-50E

Samsung claims 2k cycles from the 33J @ 4.1 -->3v . Is that total bull?

https://www.imrbatteries.com/samsung-33 ... a-battery/

On paper they seem to be touting it as 29E's big brother.

https://secondlifestorage.com/t-Samsung ... -for-Tesla
by DjSpaceGhost
May 11 2019 7:21pm
Forum: Battery Technology
Topic: Lipo pouch build
Replies: 2
Views: 351

Re: Lipo pouch build

I would not worry over much about getting rid of the heat. Because of your pack size, you wont be seeing much heat from discharge till they get about 3 years old. Even the cheap ass 20c stuff wont heat that much. But if you can afford it, get the 30-60 c cells. They will last better for sure, and s...
by DjSpaceGhost
May 10 2019 1:48pm
Forum: Battery Technology
Topic: Lipo pouch build
Replies: 2
Views: 351

Lipo pouch build

I'm considering making a 10s4p Turnigy Lipo pouch build in a 320mm x 170mm x 101mm space and by the numbers , it looks like it will just fit in a 2x2 configuration , but I'm a bit unsure about the safest way to bundle them up . I will probably rivet the contacts to save space and make a secure conne...
by DjSpaceGhost
May 04 2019 10:29am
Forum: Battery Technology
Topic: Actual Test of Pure Nickel Heat?
Replies: 24
Views: 1280

Re: Actual Test of Pure Nickel Heat?

For some reason my response didn't post yesterday. It will not get hot enough to damage plastic cell holders at less than 7 amps.
by DjSpaceGhost
May 03 2019 6:02pm
Forum: Battery Technology
Topic: Acceptable power source?
Replies: 9
Views: 611

Re: Acceptable power source?

Ok thanks for clarifying that for me.
by DjSpaceGhost
May 03 2019 1:41pm
Forum: Battery Technology
Topic: Acceptable power source?
Replies: 9
Views: 611

Re: Acceptable power source?

john61ct wrote:
May 03 2019 1:18pm
Slow low amp charging is no problem, even below 0.1C, if you're not in a hurry.

But then more likely to overcharge without an automatic HVC.
So if I go with say , a Meanwell HVG-480-48A , I could set the voltage at 41v and current at its max 10A and walk away pretty much, correct?
by DjSpaceGhost
May 03 2019 1:09pm
Forum: Battery Technology
Topic: Acceptable power source?
Replies: 9
Views: 611

Re: Acceptable power source?

Maybe I'll just stick to the often recommended Meanwells . This will be a 10s7p pack of either 29Es or 33js. I haven't decided yet for sure but I don't care about charging fast . I guess I would need around 10amps huh to charge at the recommend .5C rate ?
by DjSpaceGhost
May 03 2019 12:39pm
Forum: Battery Technology
Topic: Actual Test of Pure Nickel Heat?
Replies: 24
Views: 1280

Re: Actual Test of Pure Nickel Heat?

A 7mm wide by .2mm thick strip of pure nickel can safely handle 9.5amps so I would say definitely so .
by DjSpaceGhost
May 03 2019 11:36am
Forum: Battery Technology
Topic: Acceptable power source?
Replies: 9
Views: 611

Acceptable power source?

Would this be an acceptable power source to charge a Liion pack? Are tolerances/accuracy too loose? I know I'll have to babysit it toward the end of charge cycle. https://www.circuitspecialists.com/csi5003xe.html?otaid=gpl&gclid=CjwKCAjwza_mBRBTEiwASDWVvvPV2W09s0onLiN-1V8Vf3GJuJtqOP2EXs25p9NXXLYsApn...