Would be interesting if you could hook up some current measurement and maybe get the average energy consumption for a session.
I just gauge by how much charge current is flowing into that battery but actual Ah consumption tracking would be cool.
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I want to make a better integrated v2 (maybe with built-in caps and charger, better display, etc), and that should have the probe connections coming out at the front. Only problem is time … If your encoder fails, then I could send you a replacement. I had changed the model some time ago, because the previous one had systemic problems (even though it is a known good brand). Please send me an email to support@keenlab.de then.
If you can keep the battery leads very short (like in the picture from filipandre) then you can keep the current limit at 2000A. Otherwise you’ll have to dial in the extra length and live with less possible current. Whether to use 8AWG or 6AWG depends on your battery ESR and voltage.
I question that number, the 6Ah packs have a much lower ESR. Other than that your numbers look good. I’d start with fewer packs, recalculate based on the actual displayed current, and decide whether to add more. As long as you don’t overrate ridiculously, kWeld will safely interrupt current when exceeding 2000A. Current starts flowing gradually anyway because of the loop inductance, leaving the unit time to react.
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I did
Thay use to be better than the spec after a couple years use there just a little worse than spec so my exsperiance contradicts that
I have also experienced this. Not a huge deal but sometimes it massively spikes the position too like 15J jump to 60J or whatever.
Pretty interested in this. I’m to the point where I’m strongly considering buying a second Kweld to double welding speed (switching back and fourth to cool) and to having a backup incase one were to fail in some way it wont shut me down.
So in speaking of two welders, I currently use lipo’s wouldnt be a good solution for two welders I don’t think. If I buy a PS and 2 sets of Kcaps, then wire them in parallel with 2 Kweld’s, also in parallel I suppose, am I likely to see any problems from using them that way? I don’t want to disconnect/shut down the cooling welder each time I switch back and fourth. And I would like to do the power supply this way because I want as close to an identical power level from them as possible for consistency.
Thoughts from all?
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i welded my pack with 0.2mm very easy but havent tried anything thicker. I think it wll do .3mm too.
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The k caps only dose 1200A. dule puts it up to 1500A I think from memor.
Dual Kcaps is the way to go no matter. My concern is having two welders connected to the same pair of Kcaps and just having one sit standby while the other is being used welding and pulsing the caps.
I’m un sure if the harmonicas of the load dropping in and out would causes issues in the 2nd unit that would depend on the electronics. Voltage spikes back feed all might be potential issues might be filtered already to take it. 
Wonder if a connector on the probes is fisable to swop them. This may cause calibration issues complications tho.
Yeah I have seen people swap probes out, doesn’t seem like a bad idea, but I have found the calibration to be very important so it’s not my ideal scenario. And in the end I’m still after a second welder for redundancy.
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Is it terrible to run two 3s lipos in parallel so they’re not so stressed?
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I think as long as you keep the wire lengths down it’s probably not too bad?
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This is the planned set-up.
Two 5ah 70c lipos in parallel with xt90’s running into the qs8 connector into the Kweld.
Are the wires too long? Anything else that may cause problems? I’ve made sure the packs are the same voltage, same supplier, bought at the same date.
The wires look pretty long, we think that’s one thing that was causing problems for @jack.luis
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I’ll cut the adapter wires in half then 
Hopefully there’s no issues.
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I think there’s a calibration you can do too before you start welding, I’d recommend doing that. I think it measures values on the cables
I haven’t had to do it on mine since I set it up so I forget where it is
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I wouldn’t really call it problems. Yes shorter is better but not the only factor at play
The wire adapter length adds resistance so dose the extra connector but the fact you have now split the load acros 2 wires and xt90 has reduce the resistance think of it like 2 steps towards 1 step back.
Rember that the k weld needs a some amount of resistance with in the cables probes and power supply all explained on page 2 of the manual
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I’ll definitely run the calibration on it. The whole wiring set-up is chonk all the way through. Dual xt90 running into the Qs8 with 8ga wires, hopefully that’s enough.
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That’s a matter of opinion K weld should be
1000A min
1500A recomended
2000A max
XT90 is rated to 90A burst
XT150 is recomended
AWG 8 is rated 73A
Yes it’s super short bursts but things do really heat up proving we exceeding the limits. We overcome this by letting the system cool down but it means that you do need to keep a eye on it as it’s a DIY welder not a profecinal use all day and forget about it.
I was welding at 1800A and I got the XT150 scorching hot welding to quickly. As my lipos and probes aged I welding at 1350 and now fined my probes get hot now.
A QS 8S is a 150A connector so almost identical to what I’m useing currently
I’m not content with chunky ness so I got some AWG 6 (16mm)
Amass 250 connectors
16mm lug
Need to get off my ass and make a 3 XT90 to a 250 adaptor
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I definitely agree with chonking everything up as much as possible. I’ll see how I go for now, but if I upgrade to 6ga down the road I’ll first need to upgrade my soldering iron, 75w is not enough!
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It will be fine for building a few packs but with repetition you build skill and speed then your tools limit you. If you chunk things up down the line bare in mined you need to calculate you don’t exceed the limits layer out on page 7 of the manual.