Beginners Guide to Processing 18650 Cells | Cell Database


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Instant powerwall
#1
Hello all,

If you do not have the patience (like me) to collect, clean and test many many many used laptop cells or having a hard time to find them (also like me), using new cells is a fast(er) way to build a powerwall.
Instant powerwall may be a bit of a overstatement, it is still very much time consuming to build the packs and the inclosure, but for sure faster then collecting and testing used cells, so respect for all those who put in the time and effort to inspire and guide other builders.
After some doubt, i like to share my build.

Love to get your remarks to do things better and safer.
 



it is all up and running now, next step will be adding a " fast charger " with 3 Elcon flatpack2 chargers, controlled by the bms and powerd with my generator with heat recovery, for the darker winter day's, not sure it will work but love to do some tests.
Also like to distribute the DC battery power for all of the LED lights true the house (with some 12v converters.)

Some of the specs:

Cells: Panasonic ncr18650pf, 2900mAh
battery setup: 2 strings 14s90p, all the cells are in parralel so more of a 14s180p setup, with space to expand (with used laptop cells? Wink )
inverter: infinisolar (mpp) 48v 10kw 3phase.
bms: batrium.
solar: 18x300Wp 

Greatings,
Wim
The-J-Man, BigBen, zag2me And 5 others like this post
___________________________________
18x 300Wp solar off grid and 10x 180Wp solar tracker grid-tie
10KW 3phase hybrid inverter. 25Kwh 18650 storage (for now)
My setup: http://www.diypowerwalls.com/t-Instant-powerwall
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#2
Awesome!

what the cubboard you are using? Is it fire proof etc?

I see you have the contact coming off the same side of the pack. You might see the cell at the front discharge more then the ones at the back because of this.
BlueSwordM and wim like this post
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#3
I plan on using the same idea for joining the series connections. Looks good
wim and BlueSwordM like this post
Cell progress: 2016/10/17:
180cells@2.0
600cells@2.1-2.6a
70cells@2.7a+

Projects:
Mobile PowerBox
8Kw Powerwall
Insight Parallel PowerPak
1Kw PowerBlade
PowerRack (concept)
12v LED Sconce
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#4
(08-13-2017, 02:21 PM)The-J-Man Wrote: Awesome!

what the cubboard you are using? Is it fire proof etc?

I see you have the contact coming off the same side of the pack. You might see the cell at the front discharge more then the ones at the back because of this.

Thanks for the comment J-Man, the cubboard is a old type of office cabinet, it is all steel and the sides and doors are double steel with a solid lock and seal... so a kind of fire proof, at least fire retarding...
The connections of the packs are on the same side (so the wiring is the same length) but the "bus bar" connecting the packs with the cable is a solid 2.5cm by 0.5cm copper bar, no losses there, at least i can not messure any with my meter, the packs stays at the same voltage at all times.
Korishan and kazbach like this post
___________________________________
18x 300Wp solar off grid and 10x 180Wp solar tracker grid-tie
10KW 3phase hybrid inverter. 25Kwh 18650 storage (for now)
My setup: http://www.diypowerwalls.com/t-Instant-powerwall
Reply
#5
Awesome job man! I like the battery design alot in terms of how easy it would be to swap out a pack and all.

Batrium BMS and that green machine. Same way as I went Smile

Can you link the contactor you used for the battery?
wim and BlueSwordM like this post
Follow me! >> YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#6
(08-13-2017, 02:41 PM)wim Wrote:
(08-13-2017, 02:21 PM)The-J-Man Wrote: Awesome!

what the cubboard you are using? Is it fire proof etc?

I see you have the contact coming off the same side of the pack. You might see the cell at the front discharge more then the ones at the back because of this.

Thanks for the comment J-Man, the cubboard is a old type of office cabinet, it is all steel and the sides and doors are double steel with a solid lock and seal... so a kind of fire proof, at least fire retarding...
The connections of the packs are on the same side (so the wiring is the same length) but the "bus bar" connecting the packs with the cable is a solid 2.5cm by 0.5cm copper bar, no losses there, at least i can not messure any with my meter, the packs stays at the same voltage at all times.

Ah ok nice, im Looking for a cabinet like that, Bit smaller though.
From what Ive gathered here everyone is having the busbars on the pack come out either side (positive one way, negative the other way) to make sure the cells discharge evenly as there is less resistance for the cells at the front then the ones at the rear. This would lead to the cells closest to the front discharge more then the rear. 
Maybe ive misunderstood something but everyone is building packs with busbars coming out either end Big Grin
BTW, one of my packs will be built from those same cells Smile
BlueSwordM and wim like this post
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#7
(08-13-2017, 02:44 PM)daromer Wrote: Awesome job man!  I like the battery design alot in terms of how easy it would be to swap out a pack and all.

Batrium BMS and that green machine. Same way as I went Smile

Can you link the contactor you used for the battery?

Thanks,

Yeh, that green machine... a beast, powering my house with no problems...(not very much efficient maybe but... works for me )
The contactor is a adjustable 300A fuse with shunt trip from ABB, now connected to the bms, found it on ebay for 60 Euro (used of course).

ABB SACE S5 S5N Circuit Breaker 300AMP 3Pole 600V WITH SHUNT TRIP


(08-13-2017, 02:49 PM)The-J-Man Wrote:
(08-13-2017, 02:41 PM)wim Wrote:
(08-13-2017, 02:21 PM)The-J-Man Wrote: Awesome!

what the cubboard you are using? Is it fire proof etc?

I see you have the contact coming off the same side of the pack. You might see the cell at the front discharge more then the ones at the back because of this.

Thanks for the comment J-Man, the cubboard is a old type of office cabinet, it is all steel and the sides and doors are double steel with a solid lock and seal... so a kind of fire proof, at least fire retarding...
The connections of the packs are on the same side (so the wiring is the same length) but the "bus bar" connecting the packs with the cable is a solid 2.5cm by 0.5cm copper bar, no losses there, at least i can not messure any with my meter, the packs stays at the same voltage at all times.

Ah ok nice, im Looking for a cabinet like that, Bit smaller though.
From what Ive gathered here everyone is having the busbars on the pack come out either side (positive one way, negative the other way) to make sure the cells discharge evenly as there is less resistance for the cells at the front then the ones at the rear. This would lead to the cells closest to the front discharge more then the rear. 
Maybe ive misunderstood something but everyone is building packs with busbars coming out either end Big Grin
BTW, one of my packs will be built from those same cells Smile
No, i did misunderstood... Confused
On the packs themselve, the connections are also on the same side, you are right it is not perfect... but the draw of the cells is not that high, they have time to equilize if there is a difference in voltage between the cells... it is all in the resistance of the busbars.
___________________________________
18x 300Wp solar off grid and 10x 180Wp solar tracker grid-tie
10KW 3phase hybrid inverter. 25Kwh 18650 storage (for now)
My setup: http://www.diypowerwalls.com/t-Instant-powerwall
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#8
Wim,
Am I right in understanding that this is a pure off-grid setup with a generator for backup power?
That sails past the need to get your setup approved for grid usage off course.

What kind of appliances are running off this setup?

Keep up the good work!

Also Wim
wim and BlueSwordM like this post
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#9
That was a good price on that one Smile Its kind of the same as I have looked at. I need a slightly bigger unit though.
Follow me! >> YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#10
(08-13-2017, 10:17 PM)wimpie007 Wrote: Wim,
Am I right in understanding that this is a pure off-grid setup with a generator for backup power?
That sails past the need to get your setup approved for grid usage off course.

What kind of appliances are running off this setup?

Keep up the good work!

Also Wim
Hello Wim,
My setup is not feeding back into the grid, but i have the grid still as back-up for now, the generator is a test to see if it is possible (read practical) to be off grid, will see after a year or so of usage.
As you know, it is not cheap to have solar feeding back into the grid in Belgium.

I run all of my appliances whith my setup, like oven, washer-drier, coocingplates, heatpump, for now even my warm water system (has to change).

(08-14-2017, 05:36 AM)daromer Wrote: That was a good price on that one Smile Its kind of the same as I have looked at. I need a slightly bigger unit though.

Why am i not surprised you need a bigger fuse  Rolleyes  i have seen your video's of your rebuild... nice btw, love the doors.
BlueSwordM likes this post
___________________________________
18x 300Wp solar off grid and 10x 180Wp solar tracker grid-tie
10KW 3phase hybrid inverter. 25Kwh 18650 storage (for now)
My setup: http://www.diypowerwalls.com/t-Instant-powerwall
Reply


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