Powerwall demo

Marrcin

New member
Joined
Apr 19, 2019
Messages
24
Hello :)

Thats my little "powerfloor" created for fun and some education :D

I decide to use a repack ICR18650-26F cells (112pcs) + ICR18650-26H (28pcs) in 7s20p


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Charge controler is a Tracer 1210AN working with one 195Wp mono solar panel
230V inventer is a cheap 300W solution for truck 24V systems
Cables have a 6mm2, for balancing I order a 1s deligreen solution


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Today is its first day of working :)

Best regards Marcin :)
 

Marrcin

New member
Joined
Apr 19, 2019
Messages
24
little update ;)

I was add 28 cels to my packs
ICR18650-26H - 7pcs
LGDAS31865 - 21pcs
and also I have some laptop batterys :D


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rewraping LG's

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growing :rolleyes:

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Marrcin

New member
Joined
Apr 19, 2019
Messages
24
Parcel arrived :D

Another Tracer - 1206AN with temp. sensor

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Today start working with my 2x 10W in series, very old china panels :D

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I planing to buy another solar panels and set it:
1210AN with 1x 330W panel
1206AN with 2x 195W panels in parallel

Meanwhile I finish capacity testing some laptop cels, now i'll give them some weeks to check self discharging

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Best regards ;)
Marcin
 

Issac

New member
Joined
Jan 19, 2018
Messages
19
Hej Marcin :)

Great job, how's the outcome and capacity ?
What did you use for fusing ?
 

Marrcin

New member
Joined
Apr 19, 2019
Messages
24
Issac said:
Hej Marcin :)

Great job, how's the outcome and capacity ?
What did you use for fusing ?

Hey, sorry for late reply, now itssomething about 2,7 kWh
For fusing I use Eaton DC breakers, ANL fuse on battery,SchneiderB10 at AC site

----

update :D

added repacked 77pcs. INR18650-29E and 35LGDAS31865, now its 7S40P with ~2,7 kWh
added some breakers, bus barand metal case

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I waiting for DC breakersfor PV cables

Battery cable is 25mm^2
Bus bars made from copper20x10mm with holes for M8 screws
Batteries are on brown ceramic


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I also was change solar panels for 2x 195W + 1x 315W



Best regards


Marcin
 

Marrcin

New member
Joined
Apr 19, 2019
Messages
24
ajw22 said:
In addition to the balancer, you need to add some sort of BMS to stop charge/discharge automatically when any one pack gets too high/low. It only takes a quick distraction at the wrong time to ruin the batteries by discharging too much, or a fire by charging too much.

You right,can somebody recommend something cheaper than batrium system?
 

ajw22

Well-known member
Joined
Nov 16, 2018
Messages
576
At the moment you have just a 300W inverter.
Say at peak it uses 600W
When the batteries are near empty, you have a system voltage of just 21V.
So the worst case current draw is 600W/21V ~= 29A

For charging, it should be around 525W / 21V ~= 25A

I think something like the following would be a reasonable start. I'd go with the 60A version. It not much more expensive, you get more safety headroom, and you get the option of using a higher wattage inverter in the future. You may need the USB/PC adapter to configure more advanced parameters.
https://www.aliexpress.com/item/32840764349.html?spm=2114.12010612.8148356.1.6c5a574acdncWu
https://secondlifestorage.com/t-Good-Chinese-BMS-review


PS. not affiliated, but I use 3x of those 14s60A types (@30A max) in my powerwall. Very happy with them.
 

Marrcin

New member
Joined
Apr 19, 2019
Messages
24
Updated to 7s60p -> 4 kWh
I designed it to 60A max(1A per cell)
Packs busbars are equal for every cell,
I made it from 35mm^2 copper wire

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Next step is 60A BMS and main battery busbar (to connect other 7s packs i future)

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J_Mack58

New member
Joined
Apr 7, 2021
Messages
15
Hello :)

Thats my little "powerfloor" created for fun and some education :D

I decide to use a repack ICR18650-26F cells (112pcs) + ICR18650-26H (28pcs) in 7s20p


View attachment 5291


View attachment 18954


Charge controler is a Tracer 1210AN working with one 195Wp mono solar panel
230V inventer is a cheap 300W solution for truck 24V systems
Cables have a 6mm2, for balancing I order a 1s deligreen solution


View attachment 8641


View attachment 20095


View attachment 18590


Today is its first day of working :)

Best regards Marcin :)
Nice build, I'm a Tracer fan. Took me some time to tweak the parameter to make it do what I wanted it to do but I'm there now. Have you played with it's ModBus features... That's my next move.
 
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