Go arduino and lipo, using my sunnko and wall power was not sufficient for multiple nickle layers. I gave it away to my local hobby shop today cuz it’s bulky and very slow
To be clear the Arduino spot welder + lipo is not necessarily cheaper than the sunkko but it does produce much better welds.
If you’re only making a single pack, might be better to have someone build it for you. But if you plan on making packs in the future investing in the Arduino spot welder now may be a good idea.
How big pack are u planning to make? I know this will be unpopular and I will get hated… but if u also need higher current and know what u are doing u might as well try your hand at soldering… it does increase total volume, as the wires are thicker than nickel strips but connection is really sturdy and high amp one…
There’s also option to solder smaller fuse wire to each cell, then connect it to higher current ‘bus bar’ or rail…
Many diy powerwall builders use soldering this way, I think.
Suit yourself, there’s also sleds / trays for batteries and also some ready made kits like Vruzend and there was this one other made by a guy who is also a user on this forum.
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Dont want to talk you out of spotwelding… it can go well, if the setup is right… I assume I hated cutting each strip and laying several layers of them to get the needed current and also I chose wrong lipo, so my welder didnt work as nicely as expected…