Beginners Guide to Processing 18650 Cells | Cell Database


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Building an 18650 portable solar generator
#1
Building a 4s20p Li-Po system that can charge from solar (or other sources) into a waterproof (IP67) case.


Thoughts?
First 18650 project.
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#2
Nice and Welcome!
Just beware of the heat that can buildup if the case is sealed!
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#3
(12-07-2017, 06:39 AM)daromer Wrote: Nice and Welcome!
Just beware of the heat that can buildup if the case is sealed!

Thanks. I'm looking to do some field testing with it, this weekend. I want to monitor the system with a little probe, while it's under load.

It doesn't look like it's getting too hot--140f (60c) at the hottest parts. If it builds up heat too much, I was thinking about having part of the bottom cut out and replace with an aluminum plate, mounting the hot bits to it, acting as a heat sink.
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#4
(12-07-2017, 05:17 AM)River Wrote: Building a 4s20p Li-Po system that can charge from solar (or other sources) into a waterproof (IP67) case.


Thoughts?
First 18650 project.

You been watching Jehu's channel as well Wink

Similar to the system I'm Building but mine is 4s40p.

Are they lipo or li ion?
Looking good so far  Cool
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#5
(12-07-2017, 07:22 AM)Wattsup Wrote:
(12-07-2017, 05:17 AM)River Wrote: Building a 4s20p Li-Po system that can charge from solar (or other sources) into a waterproof (IP67) case.


Thoughts?
First 18650 project.

You been watching Jehu's channel as well Wink

Similar to the system I'm Building but mine is 4s40p.

Are they lipo or li ion?
Looking good so far  Cool

Thanks!
I just heard about Jehu a couple of days ago. I thought I was onto something special! Ha!
We did order a lot of the same parts, as it turns out. And, this being my first attempt at this, I was really relieved. I was sorta just winging it!

I don't understand why that guy bought a waterproof container and poked holes in it.

I'm looking to step up to 40p after I finish the prototyping on this. I think I'm going to toss this off a waterfall this weekend to see if it holds up! We can add the other 20 cells if it does Wink

Oh. They're LiPo.
Hard finding great deals on those things.

Oh, and this is the inlay shelf / shroud.


I'm going to vacuum form the final version after I find what works.
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#6
If they are 18650s then they most likely aren't LiPos, but LiIons. LiPos come almost exclusively in non-standard pouch formats and not in standard cylindrical cell formats.
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#7
(12-07-2017, 10:47 AM)DarkRaven Wrote: If they are 18650s then they most likely aren't LiPos, but LiIons. LiPos come almost exclusively in non-standard pouch formats and not in standard cylindrical cell formats.

That wouldn't shock me. Buying things online isn't always the best. I'll search the label
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#8
Nice build there. Really clean looking

(12-07-2017, 06:52 AM)River Wrote: It doesn't look like it's getting too hot--140f (60c) at the hottest parts. If it builds up heat too much, I was thinking about having part of the bottom cut out and replace with an aluminum plate, mounting the hot bits to it, acting as a heat sink.

If it's getting to 60C, it's already to hot. And with the lid closed, it'd get that hot all over. Definitely not good for the cells. The aluminum as a heatsink would help out a lot, good idea.
Remember, 50C is where a lot of us cut off the charging to a cell.
Proceed with caution. Knowledge is Power! Literally! Cool 
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#9
I wouldn't worry too much about 60°C while discharging as long as all the components can handle it. The cells can for sure.
But you shouldn't recharge the cells in this state so you'd have to wait after each use until you can recharge them.
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