which solder to use and is this right?

Batteries, Chargers, and Battery Management Systems.
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papasapien   1 µW

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which solder to use and is this right?

Post by papasapien » Nov 21 2020 8:17pm

someone said i should use silver solder to connect my battery lead wires to the battery. what do you guys think? why not regular solder 60/40 or 63/37?

also does this look right for my battery? the way i have the end wires for best current flow? with the stitched together wires? is that okay right?
newbat.png
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goatman   10 MW

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Re: which solder to use and is this right?

Post by goatman » Nov 21 2020 10:23pm

i use 60/40, are you running 30amps

papasapien   1 µW

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Re: which solder to use and is this right?

Post by papasapien » Nov 21 2020 10:37pm

the pack will have a max continuous discharge of 40 amps possible but my controller will only ever pull 35.

also what will the difference be if i use 63/37 vs 60/40? is that better recommended for electrical reasons or just solder preference?
thanks

goatman   10 MW

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Re: which solder to use and is this right?

Post by goatman » Nov 21 2020 10:51pm

60/40 melts quickly, 3 seconds with a 60 watt iron and the joint is done and the battery doesnt get hot but if youre spot welding the pack, solder first then spot weld the nickel strip to the battery. i tried 63/37 from a local store and didnt like it, it might have been when i was using a 40 watt iron and getting bad/cold joints, so i put it on the shelf and rode 30km to get the 60/40

goatman   10 MW

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Re: which solder to use and is this right?

Post by goatman » Nov 21 2020 10:56pm

and i melt Oatey No.95 lead free tinning flux on the battery/nickel strip first, let cool, then solder the wire to it

Balmorhea   1 MW

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Re: which solder to use and is this right?

Post by Balmorhea » Nov 21 2020 11:38pm

papasapien wrote:
Nov 21 2020 10:37pm
also what will the difference be if i use 63/37 vs 60/40? is that better recommended for electrical reasons or just solder preference?
No practical difference either way. The performance of the flux in the core will make more difference than the alloy.

Lead free? That's another matter, and something to steer clear of.
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jonyjoe303   100 W

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Re: which solder to use and is this right?

Post by jonyjoe303 » Nov 22 2020 2:43am

This is the brand I been using for years, its also 60/40 and 0.8mm is a good size, not too small or large. It works as good as the kester brand. I got 3 rolls always ready to go.
1 solder 6040.jpg
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goatman   10 MW

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Re: which solder to use and is this right?

Post by goatman » Nov 22 2020 8:13am

Balmorhea wrote:
Nov 21 2020 11:38pm
papasapien wrote:
Nov 21 2020 10:37pm
also what will the difference be if i use 63/37 vs 60/40? is that better recommended for electrical reasons or just solder preference?
No practical difference either way. The performance of the flux in the core will make more difference than the alloy.

Lead free? That's another matter, and something to steer clear of.
why stay free of lead-free tinning flux? been using it for 2 years with no battery issues and ive soldered up 5 packs using it

Balmorhea   1 MW

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Re: which solder to use and is this right?

Post by Balmorhea » Nov 22 2020 1:11pm

goatman wrote:
Nov 22 2020 8:13am
Balmorhea wrote:
Nov 21 2020 11:38pm
Lead free? That's another matter, and something to steer clear of.
why stay free of lead-free tinning flux? been using it for 2 years with no battery issues and ive soldered up 5 packs using it
I was talking about solder, not flux.

Lead free solders have higher melting points and poor wetting compared to traditional tin-lead electrical solder, in my observation. I use them for plumbing, but not for electric applications.
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999zip999   100 GW

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Re: which solder to use and is this right?

Post by 999zip999 » Nov 22 2020 2:10pm

What cells are you using brand and model number.

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