JP spot welder

[jimwebo]

Finally I received my DIY kit and I can say it works perfectly with the capacitor bank capacitive my old welder.
The charging time of the capacitors has decreased considerably, this is because the welder JP fails to discharge capacitors completely as did the thyristors of my former welder when welding in a few ms.
The time between welds is just over a second.
I am very satisfied, thank Jakob.

A greeting.
Jim.

 

[jimwebo]

A detailed photo of JP welder welds.
View attachment 1

Regards
Jim.

 

[Mammalian04]

Wow! That's going to be a monster battery!

 

[jimwebo]

Wow! That's going to be a monster battery!

If, 20P16S a motorcycle battery.

 

[marty]

Got it. Thanks.

JP notice you have no picture of your spot welder on page 1. Please use my picture if you like. I am a amateur photographer. Original picture is 4128x3096 pixels. Could email if you like.

 

[riba2233]

@tomjasz: yeah, those sea organs are one of most interesting places in Coratia. I still haven't seen them lol But I've been in Zadar.

@jimwebo: OMG that looks crazy I'm glad that someone tried capacitors. On how many volts do you charge them?

@marty: thank you a lot, I'm sure as hell going to use that picture

 

[marty]

White background.
Edit Mon Oct 02, 2017. Delete picture with white background. Think it looked hokey.

 

[riba2233]

Very well done, I'm going to put up that one also!

 

[ridethelightning]

Finally I received my DIY kit and I can say it works perfectly with the capacitor bank capacitive my old welder.
The charging time of the capacitors has decreased considerably, this is because the welder JP fails to discharge capacitors completely as did the thyristors of my former welder when welding in a few ms.
The time between welds is just over a second.
I am very satisfied, thank Jakob.

A greeting.
Jim.

im keen to try the capacitor option too.
what total value have you got there and where did you source them ,price?

 

[mistercrash]

I'm on the list for one of the welders. I have a battery made of 240 US18650V Sony cells. They are in three 4S20P modules. If I was to parallel these modules I would have a 14.8V nominal 90Ah battery capable of 5C constant discharge. Would that be sufficient to weld with the JP spot welder?

 

[Kepler]

Yet another JP spot welder build 13S6P 8)

Built this one for rockyraccoon. He will add his own BMS.



Here is the cell layout for anyone interested.

 

[riba2233]

I'm on the list for one of the welders. I have a battery made of 240 US18650V Sony cells. They are in three 4S20P modules. If I was to parallel these modules I would have a 14.8V nominal 90Ah battery capable of 5C constant discharge. Would that be sufficient to weld with the JP spot welder?

I would say yes, but don't use 4S, that's too much, just tap into 3S.

 

[tomjasz]

Yet another JP spot welder build 13S6P 8)

Built this one for rockyraccoon. He will add his own BMS.



Here is the cell layout for anyone interested.

Thanks Kepler! Adding layouts is ever so generous! Good on you. AGAIN!

 

[Golyo]

Yet another JP spot welder build 13S6P 8)

Built this one for rockyraccoon. He will add his own BMS.

Isn't it a problem that all the juice from the pack has to go through that bottleneck, that I highlighted?

How thick is the nickel you're using?

 

[Kepler]

Sorry, thought it would be pretty obvious that you would put a double layer of nickel though a section like that. Effectively there is at least two nickel links between each parallel groups. In the case of the that upper section of pack, the 2 links are on top of each other effectively providing .30mm of nickel through this section. No bottle necks in this design.

 

[fullonoob]

nice work kepler! can you do one for the flx alpha so i can copy your design

 

[Allex]

Nice one Kep! How do you draw that layout, any special software?

 

[Kepler]

I just use Visio for this sort of stuff. Easy to use and very quick to experiment with different connection options.

 

[tomjasz]

Sorry, thought it would be pretty obvious that you would put a double layer of nickel though a section like that. Effectively there is at least two nickel links between each parallel groups. In the case of the that upper section of pack, the 2 links are on top of each other effectively providing .30mm of nickel through this section. No bottle necks in this design.

Are there any other "bottle necks" besides the one highlighted? I haven't learned enough to understand them.

Thanks,

Tom

 

[Mammalian04]

We should start a Visio battery design thread. I've got a few I can put up too (though untested).

 

[fullonoob]

please do share

 

[markz]

Visio is an expensive program!

What are some other programs that are good to use, but perhaps free or cheap?

 

[marty]

My favorite drawing program. Easy to learn. $40
http://www.deltacad.com/

 

[parabellum]

There is online battery modeler (free, simple and sophisticated) somewhere, I forgot to bookmark. I think it was linked by one of the Russian guys. If someone can link it again please.

 

[cwah]

I'm about to buy the battery for the spot welder.

I'd also like to be able to spot weld 1mm aluminium or steel sheet.

Is this battery enough for that?
http://www.ebay.com/itm/251410202004