crud
Member
- Joined
- Apr 5, 2017
- Messages
- 77
So i'll start off with my projects documentation here.
Short background:
I am planning an off-grid powerwall for the garden house.
Goal is to have enough power to run LED lights, Laptop and maybe the espresso machine (if i get one with watts below 1000 ;-) ).
I'd prefere to go for a 7s 64p system at the time being.
With at least 115 AmpHours i hope to get a 2,5 to 3 kWh pack.
Right now i finished the first two packs and extracted half of the third pack.
Needs resorting and maybe some retesting, but i am happy with the little progress so far.
After each round of getting the cells from the Laptop batteries, i do a charge test, internal resistance and voltage check using these two battery chargers:
I already tested some fusewires by setting up a little test environment to get the lengthand stuff right.
I use a 50W 1R Wirewound Resistor to validate the correct amperage flow and prevent shortening out warning of the meter or power supply.
So, on we go, i hope i'll get this finished by the end of june to get the chance tocatch some rays with the solar panels
Initally, i wanted to build a solderless pack to maintain broken cells easily.
So i came up with this design:
But by now, i realized that it might be no good compromise between maintainability and cost ... maybe.
Have to redesign for 4 rows (as shown in the first real picture of the finished pack), because initially i thought of a smaller
setup using only 32p.
Decided to go for asoldered version after all, like everyone else did successfully.
I'd like to keep the busbar design, though.
I want to change the design so the the top of the cell is exposed through an opening in the top plate so the fuse can go from thetop of cell
to the busbar.
Any thoughts and critique highly appreciated
Short background:
I am planning an off-grid powerwall for the garden house.
Goal is to have enough power to run LED lights, Laptop and maybe the espresso machine (if i get one with watts below 1000 ;-) ).
I'd prefere to go for a 7s 64p system at the time being.
With at least 115 AmpHours i hope to get a 2,5 to 3 kWh pack.
Right now i finished the first two packs and extracted half of the third pack.
Needs resorting and maybe some retesting, but i am happy with the little progress so far.
After each round of getting the cells from the Laptop batteries, i do a charge test, internal resistance and voltage check using these two battery chargers:
I already tested some fusewires by setting up a little test environment to get the lengthand stuff right.
I use a 50W 1R Wirewound Resistor to validate the correct amperage flow and prevent shortening out warning of the meter or power supply.
So, on we go, i hope i'll get this finished by the end of june to get the chance tocatch some rays with the solar panels
Initally, i wanted to build a solderless pack to maintain broken cells easily.
So i came up with this design:
But by now, i realized that it might be no good compromise between maintainability and cost ... maybe.
Have to redesign for 4 rows (as shown in the first real picture of the finished pack), because initially i thought of a smaller
setup using only 32p.
Decided to go for asoldered version after all, like everyone else did successfully.
I'd like to keep the busbar design, though.
I want to change the design so the the top of the cell is exposed through an opening in the top plate so the fuse can go from thetop of cell
to the busbar.
Any thoughts and critique highly appreciated