Begginers Guide to Processing 18650 Cells | Cell Database


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Mini-Powerwall
#1
First off, glad to have found this forum.  Great source of information for yet another hobby that I didn't know existed before a couple weeks ago!!  As an IT guy for a rather large company I have access to many old laptop batteries and have started removing the 18650s for battery packs and flashlights.  Love the freebies and reusing what I used to consider "trash".

Now on to my big question: Has anyone built a "mini-powerwall"?  Looking for a solution that's semi-portable, 120v out and charge via solar. Doesn't have to power much in terms of amps but enough to cover the basics for a start. I have a pretty mediocre understanding of wiring and what not to do when it comes to electricity.  (Built a solar power cell phone charging station for tailgating and rewired most of my Victorian house without burning it down) 

<Solar Cell>
<Solar controller>
<Battery pack>
<DC to AC convertor>

Thinking about using ***** DIY Battery Kit for the pack.

Open to suggestions on the rest.  Please be gentle if I have missed something or used incorrect terminology...it's my first time.   Angel

-ck
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#2
Welcome, I have not seen any portable powerwall here, someone corrects me if I am wrong, it will not be difficult, just consider how to pack the cells so you can fit in a suitcase or similar. And make connections to easy to manage and safe for output and for solar panel input.

Check this link

https://imgur.com/gallery/b8Jpi
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#3
Well, if you consider making each pack your desired voltage, then you can make it portable. Each pack would be of a set capacity and just add to it by paralleling another pack. That would make it super portable. The only big drawback is you would need (well, recommended) a bms for each pack. And depending on how detailed you want it, it gets harder as you add functions.

Then, you just have your regular stuff (like inverter, charger, etc) external as it usually is. Unless you want all that internal in the pack itself, then you're really looking at some costs and difficulty.
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#4
How portable do you want it to be in terms of size and weight, together with charge controller and panels? And what are you going to power with 120V?

As for the *** Kit, I think I know what you mean. I have used this term in the description of my little powerboard as well and it seems be censored for some reason. Don't know the story behind it. I can tell you though, that system is not very good. I have tested it and found it has some serious issues. I have some kits spare if you want to try yourself though.
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#5
Those kits are JUNK. They have spammed the forum and several of us. Yes they do work for some but for new people they dont really give a enough reliable end result.. And trusting them to hold together without knowing how they work you will and can end up with issues in long term. Especially on mobile stuff.
With that said there is people that have suceeded and they have worked for but not for me.

Portable solar yes I have built that. No video yet though but its easily done.

Solar - > charger > battery > inverter.

Some fuses and some monitor panels and you are good to go.
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#6
Hi,

It's a coincedence, but for practice i'm working on building a portable powerpack 4s10p to be able to charge my lipo batteries on the field. I fly quadcopters for hobby, and it's useful to be able to charge the lipo's on the field.

But I also intend to build a powerwall in time, as I've always been dreaming of going off grid and finaly see it financialy doable to build it.

I'll add a pdf of the electric scheme I designed.

Have fun building!
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Attached Files
.pdf   power pack.pdf (Size: 51 KB / Downloads: 20)
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#7
Sure, just the battery can easily be built so that it is portable. I would put it in a sturdy metal case with a handle attached. That's what I was doing back in the days Smile
Out of curiosity, because I used to fly quad- and hexacopters as a hobby as well, what size of LiPos are you using? Your pack seems to be a bit small to me. I flew a DJI F550 with a 4S 10Ah LiPo. Now that's a hexacopter, but not even a big or powerful one. There are quite similar quadcopters in terms of size, weight and power.
Also, with a 10P configuration you might put a lot of load on your cells.
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#8
Much thanks all for the replies, very helpful stuff!

Is the attached image on the right track?  If so I'd like to hear what you guys recommended for each part.  (controllers, inverter,etc)


Thanks!
-ck
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#9
That totally depends.

How big will you battery be in terms of capacity? The bigger the battery the more solar panels and more powerful charge controller you might want to use.
How big will the load be? Bigger load means bigger inverter and probably bigger battery in terms of cell count to support the necessary current.

You can't design a battery first and then find out what it will be capable of and what you want to do with it. Well, you can, but you shouldn't! Smile

Your drawing is roughly correct. Solar panels connect to the charge controller which connects to the battery. Inverter connects to the load output of the controller or directly to the battery.
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#10
(09-08-2017, 07:49 PM)DarkRaven Wrote: Sure, just the battery can easily be built so that it is portable. I would put it in a sturdy metal case with a handle attached. That's what I was doing back in the days Smile
Out of curiosity, because I used to fly quad- and hexacopters as a hobby as well, what size of LiPos are you using? Your pack seems to be a bit small to me. I flew a DJI F550 with a 4S 10Ah LiPo. Now that's a hexacopter, but not even a big or powerful one. There are quite similar quadcopters in terms of size, weight and power.
Also, with a 10P configuration you might put a lot of load on your cells.

I'm flying the racing quadcopter ones. Size is like 250mm from motor center to motor center. The lipo's are 4s1p 1300mAh. I would use the power pack only to power my lipo charger. With that charger I can easily set the charging amperage to whatever is needed.
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