09-04-2017, 04:27 PM

Hi,

I am Constantin from Romania, and i will start the first PowerWall project.

I wish to make an modular PowerWall system for easy upgrading.

I will use 18650 Li-Ion Recycled battery buy-it from dismantling company.

For the frame i will use BOSH x shape aluminiu modular frame.

The electronics i will try to use as much i can the DIY circuits.

FIRST STEP - Battery

I bought 1000 Li-Ion 18650 Recycled Battery!!! the price was less then 0.4 usd/cell

Also some 100 pcs 5x4 support from China

Imax B6 Charger - chose that one becouse i can charge also some 6s pacs during the constraction, and also have a lot of function for charge and discharge!

Let's START Building!!

FIRST PROBLEM - Testing the cells

If u use recycled cells u need to test the capacity of each one! For that u need only a charger with tester function!

BUT

Every cell will need about 4 hours to charge and also will need about 6 hours to discharge if u charge it with 0.5Ah, and also discharge with low discharge function.

For me my first 1000 cels will take at minimum 10000 hours that meens 416 days if i work 24 hours on day with 1 charger !!!

The solution is to work with many chargers usuly i see is used the 4 cels version, so if u do the math if i have 16 chargers i will make 64 cels / day that will take about 15 days for 1000 cels.

On ebay the option are:

3.25$ - only the discharge function and 1 battery for 64 pcs = 208$ + tax

40$ - Charger + discharger C3100 - with analyzer function 4 cels, for 64 i need 16 pcs = 640$ - is more expensive then the cells!

This option was not ok for me!

Next QUEST - Build an DIY Multi Battery Tester - Charger Discharge

After some documentation i make this solution:

This is my first Modular 16 Cell Smart Battery Tester

Specification:

Max 8 module - 128 cell

Charging module - TP4056 with discharge protection at 2.5V

Charging Curent 520mA - 1A Fix

Discharge Curent: 420mA - 250mA by Rezistor Load

Simultan Charge max 64 cells

Display LCD 128x64

Keypad 16 keys

Smart Option

Lan/Internet Server

Online Raport / Email

SD card Data Storage

Charging Board:

Discharge Board

Battery Holders 3D Printed

That is it for the moment!

Best regards

I am Constantin from Romania, and i will start the first PowerWall project.

I wish to make an modular PowerWall system for easy upgrading.

I will use 18650 Li-Ion Recycled battery buy-it from dismantling company.

For the frame i will use BOSH x shape aluminiu modular frame.

The electronics i will try to use as much i can the DIY circuits.

FIRST STEP - Battery

I bought 1000 Li-Ion 18650 Recycled Battery!!! the price was less then 0.4 usd/cell

Also some 100 pcs 5x4 support from China

Imax B6 Charger - chose that one becouse i can charge also some 6s pacs during the constraction, and also have a lot of function for charge and discharge!

Let's START Building!!

FIRST PROBLEM - Testing the cells

If u use recycled cells u need to test the capacity of each one! For that u need only a charger with tester function!

BUT

Every cell will need about 4 hours to charge and also will need about 6 hours to discharge if u charge it with 0.5Ah, and also discharge with low discharge function.

For me my first 1000 cels will take at minimum 10000 hours that meens 416 days if i work 24 hours on day with 1 charger !!!

The solution is to work with many chargers usuly i see is used the 4 cels version, so if u do the math if i have 16 chargers i will make 64 cels / day that will take about 15 days for 1000 cels.

On ebay the option are:

3.25$ - only the discharge function and 1 battery for 64 pcs = 208$ + tax

40$ - Charger + discharger C3100 - with analyzer function 4 cels, for 64 i need 16 pcs = 640$ - is more expensive then the cells!

This option was not ok for me!

Next QUEST - Build an DIY Multi Battery Tester - Charger Discharge

After some documentation i make this solution:

This is my first Modular 16 Cell Smart Battery Tester

Specification:

Max 8 module - 128 cell

Charging module - TP4056 with discharge protection at 2.5V

Charging Curent 520mA - 1A Fix

Discharge Curent: 420mA - 250mA by Rezistor Load

Simultan Charge max 64 cells

Display LCD 128x64

Keypad 16 keys

Smart Option

Lan/Internet Server

Online Raport / Email

SD card Data Storage

Charging Board:

Discharge Board

Battery Holders 3D Printed

That is it for the moment!

Best regards