charlie hepler
1 mW
- Joined
- Dec 11, 2012
- Messages
- 15
I might be interested in some A123 cells. Where you shipping from?
bigbore said:I'm almost ready to turn my Kweld on for the first time. These are the massive 4AWG cables with 10mm diameter brass electrode holders. The electrodes I'm going to try for the first time are made with 3mm copper rode.
The pack will be around 100A-150A continious (~8A per cell). But I have 3 separate banks and I need to make interconnections between these. I intend to make these with 12AWG wires 4 pcs-s. And also output from the negative/positive cell the same and then to BMS that has 2x 8AWG input/output wires and I will use 6AWG wires coming out of the battery. So 4x 12AWG -> 2x8AWG -> 1x6AWG for negative and 4x12AWG->1x6AWG for the positive.spinningmagnets said:0.15 copper would be an improvement for high-amp cells, but 0.20mm copper (equal to 0.80mm nickel) is problematic. How many pack amps and amps per cell do you want?
No its 18p20s pack using 2000mAh cells that i have tested with 10A continious discharge (and concluded that 8A is ok for continious).spinningmagnets said:It looks like 26P, yes? That adds up when you say 8A per cell, and 150A peaks for the pack. I apologize for not looking at the pictures more closely before.
Yes it is assembled and nickel for series is fine but as i said I need interconnections between these three parts.spinningmagnets said:Since the pack(s) is/are already assembled, your only option is to overlay copper onto the current bottlenecks.
If you can get that 1600A up closer to 2000A you can probably use a lot less joules and get pulse time also down and not melt fuse. With copper pulse that long just heats the copper all around the weld and not just the spot weld.nuxland said:200J (over 1600A and 100ms)
Thats no problem with my supercapacitor pack. Right now I have it at 11,8V because more than that CAL will give me overcurrent.ossivirt said:If you can get that 1600A up closer to 2000A you can probably use a lot less joules and get pulse time also down and not melt fuse. With copper pulse that long just heats the copper all around the weld and not just the spot weld.nuxland said:200J (over 1600A and 100ms)
Pawlo2525 said:Hello . I am a new user of kweld. I have a problem. I got it yesterday I connected to the Varta battery during calibration, it reports 1550A. The problem is that once it welds, I think that after a while it burns everything even at the minimum settings, for example 2J. Reports then exceeded time It is random.I'm sorry for my English
No the inductance of a twisted pair is lower than a parallel pair, but the difference is small. Most important is to reduce loop area if you consider the current loop to be a single winding coil.Daruben said:I don't think they need to be twisted since its DC.
As you said. 1200A is plenty for nickel and nothing is enough for copper basicly :lol:. With nickel copper sandwich you probably get better results with more current. With 2nd battery paralel you may or may not go over current limit. Really no easy way to be sure before you try with your batteries and connectors.silentbike said:Bought kWeld with stock cables
Getting 1200A welding current with this battery https://hobbyking.com/en_us/turnigy...tery-pack-w-xt60-connector-roar-approved.html (140C 3S LiPo) @ 12.6V
Is this result good enough? Thinking of getting second one in parallel for the nickel plated steel & copper sandwich method.
I assume 1200A won't cut it for welding any copper. I'd like to keep the current cables like they are.
As for weld quality, I'm happy with the results. 0.2mm nickel is very easy to weld. Seems worth to me
john61ct said:Would a pack tested capable of true 25C continuous be better or worse than one that can only handle 15C?