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Off Grid 18650 Project
#1
Hi all. 
Last two years I'm collecting 18650's and finally in past 3 months I was able to create powerwall .
Currently testing and collecting more 18650's 
           
           
           
           
   
Scottietheyoung likes this post
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#2
A lot of work but FUN! What are your plans for using it?
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#3
(06-03-2019, 02:21 PM)OffGridInTheCity Wrote: A lot of work but FUN!   What are your plans for using it?

Yes fun indeed !
It's currently installed in my off grid house in woods! And I'm using it primarily for lights and some tools occasionally. 
I had two 12V 240Ah AGM batteries and one of them died so instead of buying one new battery I went 18650 way and build my one. 
The controller is re-branded MPP Solar  PIP-HS 1624  with PWM charger and 1600W 220V output. 
Currently the battery is disconnected because I'm scared to leave it unattended. I't has all the BMS-es protection, fuses and ctr. but never the less I'm still not confident to leave it plugged in. 
I have in plan to build battery monitoring system so I could remotely check the battery status of each parallel pack. (That is for other thread).  
I would like to upscale the system to have 10-15kWh.
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#4
I see 60cells per pack, assuming 2000mah average it looks like you have aprox 120ah @ 24v pack - which is about 3000watts.

You could start with a cheap BMS ($30) sort of like the meter you show in picture but actually will balance without overheating.. ISDT BattGo BG-8S Battery Meter, https://www.amazon.com/gp/product/B07797...UTF8&psc=1 This little meter will eventually balance them and will give audio alarm if a pack voltage (settable) goes to low.

A next level (that I purchased) was based on DIY Tech & Repairs youtube - checkout https://youtu.be/ClGmMY0kXvQ .

When you reach 10-15kwh you'll probably want to go on up to Batrium BMS (or other) will full control. I know its expensive, but as you grow and work with you're project and it gets bigger and bigger it will make more sense!.
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#5
(06-05-2019, 02:30 AM)OffGridInTheCity Wrote: I see 60cells per pack, assuming 2000mah average it looks like you have aprox 120ah @ 24v pack - which is about 3000watts.    

You could start with a cheap BMS ($30) sort of like the meter you show in picture but actually will balance without overheating..   ISDT BattGo BG-8S Battery Meter,  https://www.amazon.com/gp/product/B07797...UTF8&psc=1    This little meter will eventually balance them and will give audio alarm if a pack voltage (settable) goes to low.  

A next level (that I purchased) was based on DIY Tech & Repairs youtube - checkout https://youtu.be/ClGmMY0kXvQ .  

When you reach 10-15kwh you'll probably want to go on up to Batrium BMS (or other) will full control.   I know its expensive, but as you grow and work with you're project and it gets bigger and bigger it will make more sense!.

They are around 1800mAh average. I did test the twice to be extra sure. I used RePackr to sort them. 

I have BMS as I mentioned , but I'm still not confident to leave them plugged in. BMS is  P7S-20A-20A-B-V13 , they are 3 connected parallel. I did test them on small scale and they do overcharge and over discharge cut off. They also have balancing function. 
On top of that I Have Active Balance http://s.click.aliexpress.com/e/SQxrNFE that balance the batteries at 1A so they are reasonably quickly balanced but it only works if difference is more than 0.30V  .
[Image: attachment.php?aid=1333]

I was relay thinking of Batrium BMS or diyBMS . Batrium is more than enough but too expensive. I think that I will go with the diyBMS with some things I already use.
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