Andreas Kvernes
New member
- Joined
- Oct 18, 2016
- Messages
- 17
Hello!
Setting up this thread to give you all an easy way to follow my power wall build.
This is all one school project.
My power wall will feature moduleslike : solar mppt battery charger, BMS,Inverter, and touch display.
All these systems will be builtin one unitand controlled by anArduino.
Hope to see you and others following this project.
All cells have their origin from laptop batteries.
First stage: Taking out cells and getting them ready for charging. This step involved measuring each and every cell by their voltage. All cells with voltages greater than 1V have been accepted.
Second stage: Charging the cells UP TO 4.2 Volts and storing them for at least 10 days.
Third stage: Measuring voltages on each and every cell again before discharging. All cell with voltage drop greater than0.1 volts werenot accepted.
Fourth stage: Discharging the cells. 1900 mah minimum.
Fifth stage: charging discharged cells back up to storage voltage 3.8 Volts.
All cells is fused with fuse wire (positive side) . Tests have been done on this particular wire. Criteria like max Amp draw by length of wire have been tested and checked. Updates will follow on this subject.
From a total of 149 laptop batteries i got 895 cells. 560 (62.6%) of these is usable in form of a power wall. All the other cells were ether dead, had to high inner resistance or to low capacity.
The process so far..
Say goodbye to Voltage regulators. Too much Heat!
New and final layout for my ArduinoBMS/ Charge controller
Moving my Powerwall for final assembly and testing
PCB Done!
Working late nights with my most important tool.. Coffe
Nearly there.. PCB for BMS almost finished.
2 NEW and essential deliveries.. Inverter and..
Custum made "fuse box" for my powerwall components. This will give you an idea were i'm going with this project..
Testing out possible layaut for batteries and inverter. Solar mppt, bms and Arduino will fit down in the bottom right..
Ventilationand other essentials will be fitted later
A lot of work is alsodelegated hardware components (BMS, Charge Controller,etc)
Arduino progress.. BMS code and mppt charger code70% finished.
These codes will eventually be implemented true this TFT 3.2" lcd Shield + Touch Screen
Early stage in TFT screen program andYes, this layout is written in Norwegian. Code will be open source in anEnglish version as well(when finished).
Huge updates right around the corner..
Arduino updates will follow shortly..
First pack done 7 packs done
Soldering my first pack..
10 mm2 wire (7 AWG). Finalbusswire idea. Testing out layouts for the packs..
As you see the wires are fastened by sip ties
at four points. Sip ties glued to battery
holders. These buss wireswere changed to
one wire running back and forward..
See images further down..
Soldering negative side.
Getting there..
Early stage.. Packs 3/4 done. All cells getting one of these.
Missing some cells for a80 cell config.
Fist patch of batteries ready to be dismantled Loots of colors
Ready for charging
My charging/ discharging station
Setting up this thread to give you all an easy way to follow my power wall build.
This is all one school project.
My power wall will feature moduleslike : solar mppt battery charger, BMS,Inverter, and touch display.
All these systems will be builtin one unitand controlled by anArduino.
Hope to see you and others following this project.
All cells have their origin from laptop batteries.
First stage: Taking out cells and getting them ready for charging. This step involved measuring each and every cell by their voltage. All cells with voltages greater than 1V have been accepted.
Second stage: Charging the cells UP TO 4.2 Volts and storing them for at least 10 days.
Third stage: Measuring voltages on each and every cell again before discharging. All cell with voltage drop greater than0.1 volts werenot accepted.
Fourth stage: Discharging the cells. 1900 mah minimum.
Fifth stage: charging discharged cells back up to storage voltage 3.8 Volts.
All cells is fused with fuse wire (positive side) . Tests have been done on this particular wire. Criteria like max Amp draw by length of wire have been tested and checked. Updates will follow on this subject.
From a total of 149 laptop batteries i got 895 cells. 560 (62.6%) of these is usable in form of a power wall. All the other cells were ether dead, had to high inner resistance or to low capacity.
The process so far..
Say goodbye to Voltage regulators. Too much Heat!
New and final layout for my ArduinoBMS/ Charge controller
Moving my Powerwall for final assembly and testing
PCB Done!
Working late nights with my most important tool.. Coffe
Nearly there.. PCB for BMS almost finished.
2 NEW and essential deliveries.. Inverter and..
Custum made "fuse box" for my powerwall components. This will give you an idea were i'm going with this project..
Testing out possible layaut for batteries and inverter. Solar mppt, bms and Arduino will fit down in the bottom right..
Ventilationand other essentials will be fitted later
A lot of work is alsodelegated hardware components (BMS, Charge Controller,etc)
Arduino progress.. BMS code and mppt charger code70% finished.
These codes will eventually be implemented true this TFT 3.2" lcd Shield + Touch Screen
Early stage in TFT screen program andYes, this layout is written in Norwegian. Code will be open source in anEnglish version as well(when finished).
Huge updates right around the corner..
Arduino updates will follow shortly..
First pack done 7 packs done
Soldering my first pack..
10 mm2 wire (7 AWG). Finalbusswire idea. Testing out layouts for the packs..
As you see the wires are fastened by sip ties
at four points. Sip ties glued to battery
holders. These buss wireswere changed to
one wire running back and forward..
See images further down..
Soldering negative side.
Getting there..
Early stage.. Packs 3/4 done. All cells getting one of these.
Missing some cells for a80 cell config.
Fist patch of batteries ready to be dismantled Loots of colors
Ready for charging
My charging/ discharging station