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There's a new wall in Germany!
Approximately 5A loads, if I remember correctly. AveRage Joe has done several videos on them.

And yes, all component legs are basically the same. The just use resistor legs because resistors are really cheap to get in huge batches
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(09-17-2018, 12:32 AM)Korishan Wrote: Approximately 5A loads, if I remember correctly. AveRage Joe has done several videos on them.

And yes, all component legs are basically the same. The just use resistor legs because resistors are really cheap to get in huge batches

I think the other reason to use resistors is that because there are easily rated variants (1/4W, 1/2W, 1W, etc) you can be sort-of certain that one 1/4W resistor will have the same leg materiel and gauge as another - that might not be as consistent with capacitors, or diodes, etc. But even then everyone should be testing the actual fuse current of their own supplies because one manufacturer may have decided to just use the same leg gauge on both 1/4W and 1/2W resistors, or they can have different alloys, or something else.
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(09-19-2018, 05:39 AM)brwainer Wrote:
(09-17-2018, 12:32 AM)Korishan Wrote: Approximately 5A loads, if I remember correctly. AveRage Joe has done several videos on them.

And yes, all component legs are basically the same. The just use resistor legs because resistors are really cheap to get in huge batches

I think the other reason to use resistors is that because there are easily rated variants (1/4W, 1/2W, 1W, etc)  you can be sort-of certain that one 1/4W resistor will have the same leg materiel and gauge as another - that might not be as consistent with capacitors, or diodes, etc. But even then everyone should be testing the actual fuse current of their own supplies because one manufacturer may have decided to just use the same leg gauge on both 1/4W and 1/2W resistors, or they can have different alloys, or something else.

If you really want cheap reliable and consistent fuse wire use tinned copper wire. My personal preference is glass axial fuses. They are cheap if you buy them in bulk. They cost about 1c each.
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Hello guys,

haven't been here for a while due to massive workload and some other projects... but today I finished my next battery module with 700 cells (7s100p) in a nice transparent box (so everybody can admire me and my work Big Grin ):




Balancing (as you can see, it's almost perfectyl balanced), fusing and voltage monitoring is included, overall weight is 50kg.
Total number of cells in production now is 2940. That makes around 21kWh@24V. Including the 6 old SLA batteries (2s3p, each 280Ah), I now have around 40kWh.

Here're some more pictures from building the battery bank.

Enjoy and have sun Cool 
Oliver


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Cells tested: 5140 (overall: 9974 Ah, average: 1940 mAh)
Cells in production: 2940 (overall: 6174 Ah, average: 2100 mAh)
Wall bank: 7s320p, 672 Ah, 16 kWh
Box bank: 7s100p, 210 Ah, 5 kWh
Project page
Live solar/powerwall values
Daily graph
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Great Work as always
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(10-14-2018, 12:35 PM)owitte Wrote: Hello guys,

haven't been here for a while due to massive workload and some other projects... but today I finished my next battery module with 700 cells (7s100p) in a nice transparent box (so everybody can admire me and my work Big Grin ):
Wow, just wow! Truly inspiring!
Newb question here. What's the best way to solder the resistor legs onto 18650s? I heard discharge the cells to ~50% and I imagine heat the battery as quickly as possible so as to not damage it. Any other tips or sources for exact details?
Thank you in advance.
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(10-15-2018, 05:18 AM)heytae Wrote:
(10-14-2018, 12:35 PM)owitte Wrote: Hello guys,

haven't been here for a while due to massive workload and some other projects... but today I finished my next battery module with 700 cells (7s100p) in a nice transparent box (so everybody can admire me and my work Big Grin ):
Wow, just wow! Truly inspiring!
Newb question here. What's the best way to solder the resistor legs onto 18650s? I heard discharge the cells to ~50% and I imagine heat the battery as quickly as possible so as to not damage it. Any other tips or sources for exact details?
Thank you in advance.

use a good soldering iron with a massive tip and try to heat up the soldering spot as quick as possible. No need to discharge the cells first, imho.

Have sun!
Oliver

Cells tested: 5140 (overall: 9974 Ah, average: 1940 mAh)
Cells in production: 2940 (overall: 6174 Ah, average: 2100 mAh)
Wall bank: 7s320p, 672 Ah, 16 kWh
Box bank: 7s100p, 210 Ah, 5 kWh
Project page
Live solar/powerwall values
Daily graph
Reply
Wow, thx owitte!
Im totally impressed. I live in Salzgitter and want you to ask, if it’s possible to have a look to your masterpiece.
Greetz auke
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Hello. I really liked Your work, You are good. I would like to ask you to reset the full description and used details and how to do it. I just have a crisis in Ukraine and it's getting more expensive, and saving electricity would have helped me a lot. if you can go to the email:********. Thank you in advance.
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Chimaera: I removed your email. If you want a personal message, we use PM's here. If after that you send the email, that's fine.
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Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

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