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Spot welder / spotwelder choosing the right one
#1
Hey Guys !

As many people before me, and after sooner or later think about buying (or making) one for them self to proper build their pack.

I checked forum and did't find a proper topic about this.

So there's many Sonkko one, but not much more.

I'm too stupid to build one myself (tried already, failed and get electrocuted - so I'll better stick to low DC voltage Confused ), so I figure just buy one.

Could you please advise on purchase:
Is it worth 120$ for SUNKO 737G or it's mandatory to 190-230$ for 709A/AD or kweld ?
shielsy66 and bournevexed like this post
Packs build:
7S1P 60Ah ~1.5kW SAMSUNG SDI prismatic cells - I'm looking for more info about them / PV if you know more Huh
7S84P 240Ah ~6.2kW from 588x cells LG MG1 2850mAh
Inverter - 3kW AIMS  pure sine
Solar - considering addding 220W with MPPT Make Sky Blue 30A
Set up for mobile gastronomy 2kW cooling compressor + 500W appliancies
Spot Welder - Mactronic V3.
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#2
Hey Isaac,

I'm using the malectrics arduino spot welder https://malectrics.eu/ with a 3S 5000mAh 65-130C Lipo
which I bought seperate. I've had it for about 10 days & just recently put it together which is very easy.
Pretty straight forward! Though I'm not using the foot switch(personal choice as the welder has auto detect).
Its an awesome piece of kit.

Just so you can see:

here are the Lipo Battery assembly instructions:

https://malectrics.eu/lipo-battery-bundl...tructions/


And the Car Battery assembly instructions:

https://malectrics.eu/car-battery-bundle...tructions/

here is a photo of what i didyesterday on some cells i have.

stevelectric, Issac, choncy12 And 1 others like this post
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#3
Im using the Suunko 709A. Do not go with smaller than that one if you plan for the AC powered version. I like that version since it just works and I dont have to bother with batteries. BUT it demands 16A slow blow fuse and 230VAC system.
Issac likes this post
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#4
@bournevexed

That's looks interesting. Did you consider kweld before buiyng ?
What convinced you ?

@daromer
I could have problem with proper ameperage on 230VAC - fast fuse box in house.
But as there's more possibility with DC, so I'll think better go this way, especially for me when I have 12x350F ultracaps conected in 6S2P with can deliver in 16,2V max of 1680A in short circut !!! (slowly charging from any DC source via converter, with BMS of course - cost of build~80$)
Packs build:
7S1P 60Ah ~1.5kW SAMSUNG SDI prismatic cells - I'm looking for more info about them / PV if you know more Huh
7S84P 240Ah ~6.2kW from 588x cells LG MG1 2850mAh
Inverter - 3kW AIMS  pure sine
Solar - considering addding 220W with MPPT Make Sky Blue 30A
Set up for mobile gastronomy 2kW cooling compressor + 500W appliancies
Spot Welder - Mactronic V3.
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#5
DC source is easy if you have the supply for it. Some more intital work only Smile
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#6
@daromer I can easily change supply for the supercaps if needed.

So for now: (current price incl. shipping)

EUR215 kWeld VS EUR145 Arduino Battery Spot Welder Kit V3.3 145EUR

I prefer kWeld but 70EUR difference is just enormous, do you have some justify to cover the price difference ?
Packs build:
7S1P 60Ah ~1.5kW SAMSUNG SDI prismatic cells - I'm looking for more info about them / PV if you know more Huh
7S84P 240Ah ~6.2kW from 588x cells LG MG1 2850mAh
Inverter - 3kW AIMS  pure sine
Solar - considering addding 220W with MPPT Make Sky Blue 30A
Set up for mobile gastronomy 2kW cooling compressor + 500W appliancies
Spot Welder - Mactronic V3.
Reply
#7
I'm using the 110v version of the 709a. Haven't had any issues.
Issac likes this post
My Wall: 14s100p modular, 49x 165w CIGS panels, a couple sunnysky MPPT controllers, Sigineer 6kW inverter, Chargery BMS24T
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#8
malectrics here too.
5000+ weld points fine and its fun.car battery with 500+ cranking Amps ad only 55 Ah
Issac likes this post
Building Lifepo4 Powerwall - atm 3400 cells growing
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#9
I prefer kWeld but 70EUR difference is just enormous, do you have some justify to cover the price difference ?

I researched as best as I could but also went with the cheapest tab welder. I got the older version 2 maletrics which only runs on car battery (no lipo) and had a primitive lcd screen. But using 6 gauge pure copper welding cables for the probes gave me very good performance, excellent weld at number 4 power setting on 0.15 nickle strip, it goes up to 9 power setting so the welder is very powerful even at the lower settings. You need to do the welds at the lowest setting that gets good results, the higher the power level the hotter your cables get, they can become too hot to hold very quickly if the wire gauge is too low which require higher power. The newer version 3 that came out is very similar to the kweld and it was cheaper then the version 2. 

Many people think the AC units because of the 120 volts it uses is more powerful, but if anything I read many reviews of them blowing house fuses. That is something to check before buying a plug in model.

I been using the maletrics with a small 28ah agm battery, works fine with that, you can probably use it with a lead acid jump pack a long as you use thick gauge pure copper cable everywhere. The small tab welders are also easy to store when not in use.
Issac likes this post
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#10
I have the malectrics welder as well - I bought it a year ago before the Kwelder was all the rage. It's so easy to use you kinda feel stupid about it, because what it does and how it works is just so simple.
Definitely don't use a huge car battery though. I have mine hooked up to the only "free" car battery I had laying around, at at 1000cranking amps, the thing nearly melts holes through everything even on the lowest possible setting. The only thing I don't like about it is that there really isn't that much info I could find about the malectrics one - on what settings to use etc. You can do auto pulse (it detects when both are touching, waits a for an adjustable delay, then just zaps) and you can adjust pre-pulse and overall pulse duration. That's pretty much it. So when I watch Daromer's excellent videos, none of his settings or methods really translate at all to what I'm doing.

However, if you stick to a battery that isn't massive and has a cranking amps of closer to the 600 ish range, then you should be good from what I can see. Since it's based on mosfets, I don't see why it would "wear out" over time. And I can tell you from someone who has put over 1000amps through it, that it has held up fine so far.
Issac likes this post
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