Search found 391 matches

by garolittle
Apr 19 2020 11:23pm
Forum: Battery Technology
Topic: kWeld - "Next level" DIY battery spot welder
Replies: 1146
Views: 158474

Re: kWeld - "Next level" DIY battery spot welder

So it has been a while since I posted on this discussion forum. I am the proud new owner of a Kweld unit and I want to make sure I have the proper power source. I will be spot welding .20mm or .30mm pure nickel strips to 18650 batteries. Is the following a good power source for this purpose? Thanks....
by garolittle
Apr 18 2020 6:57pm
Forum: Battery Technology
Topic: Pack Cycle Life - Can you help with the math?
Replies: 15
Views: 477

Re: Pack Cycle Life - Can you help with the math?

“I think the key for you is to measure the temperature carefully at different locations in the pack.
Og you can keep these comparable in a smaller pack, your test results should be useful. But I Think that this is crucial to get right if you want to do a scale pack”

Good ideas. Thanks! Gary
by garolittle
Apr 16 2020 6:38am
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 251
Views: 54193

Re: Spot Welding Copper Strips to 18650 Battery Cells

serious_sam wrote:
Apr 15 2020 11:59pm
Beasty!

Those 3 holes are very close to the bend. Do you have enough room for fasteners ? How do you attach ?
Untitled.jpg
Good catch. I did not see that. Awesome project by the way!
by garolittle
Apr 15 2020 8:24pm
Forum: Items for Sale - Used
Topic: Curtis Controller 1236-SE $625
Replies: 1
Views: 204

Re: Curtis Controller 1236-SE $625

Wiring harness included
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299417AE-FF69-45BB-AC3F-C5B05A2DD3B0.jpeg (117.46 KiB) Viewed 148 times
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BCAF427B-3BB2-4AB4-BAB7-D8C7B1BF571D.jpeg (70.38 KiB) Viewed 148 times
by garolittle
Apr 14 2020 11:13pm
Forum: Items for Sale - Used
Topic: Curtis Controller 1236-SE $625
Replies: 1
Views: 204

Curtis Controller 1236-SE $625

Send PM or text at 706-513-3367 Price: $625 (Free Shipping anywhere in USA) Curtis Controller: Model 1236SE-5621 Maximum Amps: 650A Condition: Used on our prototype since May 2019. See pictures below. Works extremely well and we are only selling it to raise cash for our upcoming production line. 100...
by garolittle
Apr 14 2020 7:43pm
Forum: Items for Sale - Used
Topic: Nissan Leaf Modules 58 aH
Replies: 22
Views: 2779

Re: Nissan Leaf Modules 58 aH

Sold. Thanks.
by garolittle
Apr 14 2020 6:54am
Forum: Battery Technology
Topic: Pack Cycle Life - Can you help with the math?
Replies: 15
Views: 477

Re: Pack Cycle Life - Can you help with the math?

T A cheaper possibility could be to make a smaller (and cheaper) test-pack or do individual cell tests. These should be scaleable as long as you have good thermal management in the final battery pack. BTW i strongly disagree that you should use LIPO. That amount of energy stored in LIPOS is just wa...
by garolittle
Apr 12 2020 10:13pm
Forum: Battery Technology
Topic: Pack Cycle Life - Can you help with the math?
Replies: 15
Views: 477

Re: Pack Cycle Life - Can you help with the math?

...But if the use case **requires** fast charging, then you just accept replacing the pack more frequently. These general relationships between the variables are the same whether LI round cells, hobby LiPo, pouches, EV packs or the big LFP prismatics. But as I said, every factor is infinitely varia...
by garolittle
Apr 12 2020 10:08pm
Forum: Battery Technology
Topic: Pack Cycle Life - Can you help with the math?
Replies: 15
Views: 477

Re: Pack Cycle Life - Can you help with the math?

You can do 750 cycles with good charge discipline too. In a race/track situation, you're going to be running high percentage of lap time at WOT, so peak current is going to be occurring for a significant amount of time. There's going to be minimal "continuous" level current usage. Throttle mostly o...
by garolittle
Apr 12 2020 10:05pm
Forum: Battery Technology
Topic: Pack Cycle Life - Can you help with the math?
Replies: 15
Views: 477

Re: Pack Cycle Life - Can you help with the math?

john61ct wrote:
Apr 12 2020 6:57pm
.....
If you can expand Ah capacity due to improved energy density, you are reducing the C-rate **and** can leave more capacity in the cell after a given range

which multiplies longevity

further increasing value as in $/Ah **per year**
Now that is an awesome quote I will not forget! Thanks
by garolittle
Apr 12 2020 6:21pm
Forum: Battery Technology
Topic: Pack Cycle Life - Can you help with the math?
Replies: 15
Views: 477

Re: Pack Cycle Life - Can you help with the math?

flat tire wrote:
Apr 12 2020 3:12pm
You need rc lipo ......
Really appreciate the response. Good info and I will certainly research it more. Thanks
by garolittle
Apr 12 2020 1:20pm
Forum: Battery Technology
Topic: Pack Cycle Life - Can you help with the math?
Replies: 15
Views: 477

Re: Pack Cycle Life - Can you help with the math?

I really appreciate the response. That is excellent information. Already implementing some of these ideas on the existing prototype pack. Definitely use “slow charging” and usually stop at 4.1V per cell. Very good points regarding SOC and SOH. Really appreciate the response. Check us out www.venomka...
by garolittle
Apr 12 2020 12:22pm
Forum: Battery Technology
Topic: Pack Cycle Life - Can you help with the math?
Replies: 15
Views: 477

Pack Cycle Life - Can you help with the math?

Question regarding “battery pack cycle-life”. This is a possible battery pack an electric go kart prototype. Here are the assumptions: 81.4V Battery pack consisting of of 22S/20P LG HG2 cells which are 3,000 mAh. Maximum current will be 300A and continuous current will be 200A. Pack will be charged...
by garolittle
Apr 03 2020 2:50pm
Forum: General Discussion
Topic: Something to make your smile "electric"...
Replies: 8
Views: 418

Re: Something to make your smile "electric"...

Balmorhea wrote:
Apr 03 2020 1:56pm
It’s a fine time for goofing around, but a bad time to have to go to the hospital.
Correct. Hopefully things will get better soon. We will definitely do our part here in Georgia. Going in full lockdown mode today. Staying at home.
by garolittle
Apr 03 2020 12:22pm
Forum: General Discussion
Topic: Something to make your smile "electric"...
Replies: 8
Views: 418

Re: Something to make your smile "electric"...

Icewrench wrote:
Apr 03 2020 12:19pm
Hope this helps.... :)


Yes.
Yes it does help.
Hang in there! Tough times but we will get through this.
by garolittle
Apr 03 2020 9:26am
Forum: General Discussion
Topic: Something to make your smile "electric"...
Replies: 8
Views: 418

Re: Something to make your smile "electric"...

And one more for all the small businesses out there. Hang in there! The VenomKarts Team

https://youtu.be/zf5YuKJCTxo
by garolittle
Mar 31 2020 10:28pm
Forum: General Discussion
Topic: Something to make your smile "electric"...
Replies: 8
Views: 418

Re: Something to make your smile "electric"...

Too cool. Back in the day my best friend won the cart west coast championship in 2 cycle non shifter class. Thanks. That’s awesome. Our electric prototype is geared more towards the LO206 market as opposed to shifter carts. However we would love to go head to head with a shifter kart when we get a ...
by garolittle
Mar 28 2020 11:06pm
Forum: Items for Sale - Used
Topic: Nissan Leaf Modules 58 aH
Replies: 22
Views: 2779

Re: Nissan Leaf Modules 58 aH

Yes or Highpoint, NC.
by garolittle
Mar 22 2020 9:48pm
Forum: Battery Technology
Topic: Spot Welding Copper Strips to 18650 Battery Cells
Replies: 251
Views: 54193

Re: Spot Welding Copper Strips to 18650 Battery Cells

183sunman wrote:
Mar 22 2020 10:07am
There is a tes of using it 48.8mOh whole pack 24S3P A123
Very nice looking pack. Excellent work.
by garolittle
Mar 16 2020 12:51pm
Forum: Battery Technology
Topic: High End Spot Welding Services
Replies: 10
Views: 1110

Re: High End Spot Welding Services

999zip999 wrote:
Mar 16 2020 9:22am
Have you found any luck on people supplying custom battery services ?
Found a few in Florida. Really appreciate all of your suggestions.
by garolittle
Mar 10 2020 10:06pm
Forum: Battery Technology
Topic: High End Spot Welding Services
Replies: 10
Views: 1110

Re: High End Spot Welding Services

999zip999 wrote:
Mar 10 2020 9:31pm
Or contact IMR in Texas as they sell lots of cells.
Yes sir. I will do that as well. Thanks for the suggestion.
by garolittle
Mar 10 2020 9:23pm
Forum: Battery Technology
Topic: High End Spot Welding Services
Replies: 10
Views: 1110

Re: High End Spot Welding Services

If you are looking for copper series connection because of high amp-demand, consider the "copper sandwich" This is where nickel (or nickel-plated steel) is placed over copper (the copper is touching the cell), and for a variety of reasons, the copper can weld easily to the 18650/21700 cell-tip. I'd...
by garolittle
Mar 09 2020 8:11pm
Forum: Battery Technology
Topic: ISO of professional spot welding services (see link)
Replies: 0
Views: 1138

ISO of professional spot welding services (see link)

Need professional spot welding services as seen in the link below. Southeastern USA would be perfect. Thanks for any recommendations for vendors who have this advanced equipment.

https://youtu.be/JPhTOHxF3hM
by garolittle
Mar 07 2020 10:40am
Forum: Battery Technology
Topic: High End Spot Welding Services
Replies: 10
Views: 1110

Re: High End Spot Welding Services

litespeed wrote:
Mar 07 2020 10:38am
Maybe contact Orion and ask for who bought these pulse arc welders. I’m sure some are transparent and obviously do outside work.

Tom
Cool idea. Thanks.