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New buld
#1
Im now testing cells (local &ebay) for a 48V system off grid , i have a background in electric and mechanical engineering (steel industry) and figured I should put that to work. one thing that does concern me is so many people are using resistor leds or small size copper wire as a fuse I guess in all reality that just doesn’t make sense to me when you can easily find a 1000 3x10mm axial glass fuses for $10 with free shipping I guess I’m wondering why are people risking so much. I will be spot welding and  I am now looking For suggestions on a good  battery spot welder really don’t 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
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#2
Welcome!

I run this spot welder

In this thread you have several of my videos in the topic
http://secondlifestorage.com/t-Spot-weld...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.
Angel K Ma and Oderus420 like 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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#3
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/prod...plete-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/UCHdQgHk...Xug/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: https://youtu.be/7khUZ4IYS-0?t=189
And I guess there are many more videos about this one as well.
Angel K Ma likes this post
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#4
(12-30-2017, 08:02 AM)daromer Wrote: Welcome!

I run this spot welder

In this thread you have several of my videos in the topic
http://secondlifestorage.com/t-Spot-weld...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/SUNKKO-7...eLevelAB=5
Angel K Ma likes this post
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#5
I linked the AD model. Its upgraded with internal fan and some other nice small features Smile  You can get the 709 for same price on Ebay in general.

216USD on ALliexpress here: http://s.click.aliexpress.com/e/e6uZrzV  (Or even 183 it looks like?)

Though its mentioned as 1.5kW meanwhile the other is 1.9kW. http://s.click.aliexpress.com/e/I2FYzbY
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
I didn't notice the model difference when I ordered mine but I'm quite happy with it.
Angel K Ma likes this post
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#7
The A version will work just fine. The AD is a bit more toughened up for more heavy use kind of.
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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#8
I’m now testing cells (local &ebay) for a 48V or 24V system off grid , i have a background in electric and mechanical engineering (steel industry) and figured I should put that to work. one thing that does concern me is so many people are using resistor leds or small size copper wire as a fuse I guess in all reality that just doesn’t make sense to me when you can easily find a 1000 3x10mm axial glass fuses for $10 with free shipping I guess I’m wondering why are people risking so much. I will be spot welding and  I am now looking For suggestions on a good  battery spot welder really don’t 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 kill and 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 the steel industry it was very hard to find a company that would be willing to hire a female for a extremely dominated male industry.

    Im experimenting with 18650 cell holders (battery box holder with 8 Pins Contact)  with busbars made from 8 or 4 gauge 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 I’m looking at using micro inverters each one with their own 60/80S 6P 24V pack creating zones within the house. I know this maybe overkill but I’m 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. 

 I’m makng a testing tool that very quickly can give the resistance and amp of every cell something that takes less than a minute to get results as soon as I’m done with it I will post pictures and parts list/ schematic drawing  it was a total cost that will be ridiculously cheap.
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#9
Sounds interesting, will be following your progress  Smile
                                                Choose LiFe  Wink

                      May all your batteries be fully charged and perfectly balanced  Cool
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