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Angel K Ma

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Im now testing cells (local &ebay)for a 48Vsystem off grid, i have a background in electric andmechanical engineering (steel industry)and figured I shouldput thatto work. one thing that does concern me is so many people are using resistor leds orsmall size copperwire as a fuse I guess in all reality that just doesnt make sense to mewhen you can easily find a 1000 3x10mm axial glassfuses for$10 with free shipping I guess Im wondering why are people risking so much. I will be spot welding and I am now looking Forsuggestions on a good battery spot welderreally dont want to spend more than $350. I might design is super capacitor spot welder if I do I will post materials specs everything for everyone here
 
Welcome!

I run this spot welder

In this thread you have several of my videos in the topic
http://secondlifestorage.com/t-Spot-weld-fuse-wire-to-your-packs

Using fuse wire is what I would say equal or close to same as using the glass fuses. Its just a matter of what type of fusing you want. There is no standard around this topic since it is a DIY build and the important thing is that you use something that will suit as a fuse.
 
Welcome!

I consider using fuse wire the exact opposite of a risk. Fuse wire is a proven and widely available method. It's also very easy and quick to deploy on your battery.

I just got my spotwelder delivered, which is battery powered, and there several similar models emerging.
This is the one I have: https://www.kicksurfer.de/index.php/product/kweld-complete-kit/
It is made in small batches and the current batch is sold out, but there will be more batches in the future and you can join a waiting list.
Videos, by the guy who made it, can be found here: https://www.youtube.com/channel/UCHdQgHkYvGcrX2Jh09NvXug/videos

Since I did some research in that direction I also learned about another, similar device: https://malectrics.eu/
Can't say much about this one other than that it seems to work very well. A short introduction by somneone who bought it can be found here:
And I guess there are many more videos about this one as well.
 
daromer said:
Welcome!

I run this spot welder

In this thread you have several of my videos in the topic
http://secondlifestorage.com/t-Spot-weld-fuse-wire-to-your-packs

Using fuse wire is what I would say equal or close to same as using the glass fuses. Its just a matter of what type of fusing you want. There is no standard around this topic since it is a DIY build and the important thing is that you use something that will suit as a fuse.

I too have the 709A as it's quite popular but I didn't pay more than ~$290 CAD from AliExpress. It even had free shipping and it arrived in 2 weeks or so which is really fast for China. Here's the link for the 709A on Aliexpress.https://www.aliexpress.com/item/SUN...31ef3816&transAbTest=ae803_4&rmStoreLevelAB=5
 
The A version will work just fine. The AD is a bit more toughened up for more heavy use kind of.
 
Im now testing cells (local &ebay)for a 48V or 24V system off grid, i have a background in electric andmechanical engineering (steel industry)and figured I shouldput thatto work. one thing that does concern me is so many people are using resistor leds orsmall size copperwire as a fuse I guess in all reality that just doesnt make sense to mewhen you can easily find a 1000 3x10mm axial glassfuses for$10 with free shipping I guess Im wondering why are people risking so much. I will be spot welding and I am now looking Forsuggestions on a good battery spot welderreally dont want to spend more than $350. I might design is super capacitor spot welder if I do I will post materials specs everything for everyone here[/quote]
I know my plan are completely over killand will change as things progress I worked in the steel industry and manufacturing for years in maintenance this includes a masters in electric engineering and a bachelors in mechanical engineering, when I had to stop working for medical problems disabilities I found out very quickly not keeping my brain active severe depression sets so this is a challenge I am excited to begin when I started in thesteel industry it was very hard to find a company that would be willing to hire a female fora extremely dominated maleindustry.

Im experimenting with 18650 cellholders (battery box holder with 8 Pins Contact) with busbars made from 8 or 4gauge solid copper wire if I go with Square stock couple bars I may drill and tap instead of soldering. I want something that will make swapping out cells including the fuses an easy task. I want to make sure that each cell is treated very gently keeping there ware &tear down to a minimum this will include an infrared camera to look for any possible hotspots. As for my panels Im looking at using micro inverters each one with their own60/80S 6P24V pack creating zoneswithin thehouse.I know this maybe overkill but Im building this to be reliable and 100% off grid.I have a lot of roof space for quite a few panels and with the different angles on it bing able to cover pretty much anytime of day for maximum sun exposure.All lights will be LED all appliances will be energy-efficient.While this is a work in progress.

Im maknga testing tool that very quickly can give the resistance and amp of every cellsomething that takes less than a minute to get results assoon as Im done with it I will post pictures and parts list/schematic drawing it was a total cost that will be ridiculously cheap.
 
Sounds interesting, will be following your progress :)
 
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