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DIY spot welder - easy project - make your own battery packs

BarkingSpider

Carbon Lifeform
Joined
Apr 14, 2020
Messages
440
Location
Silicon Valley, CA
I just completed mine based on a similar system by a guy in the UK. Works great. Handles .15mm zinc no problem.

I used this for the pen and switch ($22)
Amazon.com

This for a secondary switch that I prefer. ($7)
Amazon.com

This relay ($13)
Amazon.com

A small old 300a AGM battery from my garage and some battery cables. (Free)

Makes perfect, strong welds for under $45 and it's fun to use.

Let me know if you need a more detailed wiring diagram.

IMG_20201209_160014.jpgIMG_20201209_160028.jpgIMG_20201210_165733.jpg

To get the right duration, I just practiced welding a zinc strip to a large washer. Just a momentary tap on the foot pedal is enough.

I make lots of Lifepo4 batteries in 12/24/48v formats for testing. It's perfect for that.

Its a 300amp 13v pulse. 4000W!

If your want a bigger weld, simply tap again on the same spot.

Its handy, I've been fixing other things around the house with it, tattoo anyone?
 
Last edited:
Nice to hear some first hand experience!
I'd come across something similar after seeing this video and dreams of DIYing my own house batter ran through my mind.
 
I just completed mine based on a similar system by a guy in the UK. Works great. Handles .15mm zinc no problem.

I used this for the pen and switch ($22)
Amazon.com

This for a secondary switch that I prefer. ($7)
Amazon.com

This relay ($13)
Amazon.com

A small old 300a AGM battery from my garage and some battery cables. (Free)

Makes perfect, strong welds for under $45 and it's fun to use.

Let me know if you need a more detailed wiring diagram.

View attachment 29931View attachment 29932View attachment 29933

To get the right duration, I just practiced welding a zinc strip to a large washer. Just a momentary tap on the foot pedal is enough.

I make lots of Lifepo4 batteries in 12/24/48v formats for testing. It's perfect for that.

Its a 300amp 13v pulse. 4000W!

If your want a bigger weld, simply tap again on the same spot.

Its handy, I've been fixing other things around the house with it, tattoo anyone?
 
I got everything put together and working but I am not at all happy with the results. Either I blow a hole in the tab or I don’t get a weld. Is there a preferred thickness of metal strip?
 
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