Hello Group,
Today I am posting about a LifePO4 pack I have constructed and am testing. I share this stuff for the benifet of the group so that you can see what is out there and at least how one guy (myself) puts it together, along with some supplemental testing.
This pack is constructed of Tenergy 5.5AH LifePO4 cells. Here is a picture of a single cell:
https://1drv.ms/i/s!AmzmftzD-V0mhwo1TMrbdiz1bvNd
The pack is constructed with a total of 40 cells. I made four banks of ten cells and put them in series. Here is a shot of the four strings assembled. I used welding rod for the bus bars, same kind as we use for coil cores. The plugs you see at the top are going across each cell pos and neg so that I can attach balancing boards which will be removable. I plan to build more of these packs and you only need the balance board while charging so I have made them detachable.
https://1drv.ms/i/s!AmzmftzD-V0mhwsXG_6xcHaztEIQ
The next step I took was to hot glue some foam sheeting to the pack. This is to minimize any accidental knocking around of the pack and protect the buss bars a little.
https://1drv.ms/i/s!AmzmftzD-V0mhwyenX43bEoKVcS_
To finish off the pack I wrapped it with hot tape. Here you can see the finished pack with the balance boards attached.
https://1drv.ms/i/s!AmzmftzD-V0mhw3d9JK7lqqIhFWX
https://1drv.ms/i/s!AmzmftzD-V0mhw7XC5WdF1r-YlpZ
And just to see how it would go I hooked up my 400 watt inverter to the pack and charged another prismatic 20AH pack that I have. The charger is a 10 amp charger and everything ran fine, no heat on the batteries and the inverter and charger got slightly warm.
https://1drv.ms/i/s!AmzmftzD-V0mhw-2-yig-OkRra1u
Finally here is a discharge curve from CBA testing. This was a 10A draw and I got 50AH from the pack. Technically it should be a 55AH pack but I'm impressed with how well it performed. Most real life loads are not going to be a constant current and probably not 10A but it shows that this thing does store some serious power.
https://1drv.ms/i/s!AmzmftzD-V0mhxAmNNnC8mYI4bKC
Today I am posting about a LifePO4 pack I have constructed and am testing. I share this stuff for the benifet of the group so that you can see what is out there and at least how one guy (myself) puts it together, along with some supplemental testing.
This pack is constructed of Tenergy 5.5AH LifePO4 cells. Here is a picture of a single cell:
https://1drv.ms/i/s!AmzmftzD-V0mhwo1TMrbdiz1bvNd
The pack is constructed with a total of 40 cells. I made four banks of ten cells and put them in series. Here is a shot of the four strings assembled. I used welding rod for the bus bars, same kind as we use for coil cores. The plugs you see at the top are going across each cell pos and neg so that I can attach balancing boards which will be removable. I plan to build more of these packs and you only need the balance board while charging so I have made them detachable.
https://1drv.ms/i/s!AmzmftzD-V0mhwsXG_6xcHaztEIQ
The next step I took was to hot glue some foam sheeting to the pack. This is to minimize any accidental knocking around of the pack and protect the buss bars a little.
https://1drv.ms/i/s!AmzmftzD-V0mhwyenX43bEoKVcS_
To finish off the pack I wrapped it with hot tape. Here you can see the finished pack with the balance boards attached.
https://1drv.ms/i/s!AmzmftzD-V0mhw3d9JK7lqqIhFWX
https://1drv.ms/i/s!AmzmftzD-V0mhw7XC5WdF1r-YlpZ
And just to see how it would go I hooked up my 400 watt inverter to the pack and charged another prismatic 20AH pack that I have. The charger is a 10 amp charger and everything ran fine, no heat on the batteries and the inverter and charger got slightly warm.
https://1drv.ms/i/s!AmzmftzD-V0mhw-2-yig-OkRra1u
Finally here is a discharge curve from CBA testing. This was a 10A draw and I got 50AH from the pack. Technically it should be a 55AH pack but I'm impressed with how well it performed. Most real life loads are not going to be a constant current and probably not 10A but it shows that this thing does store some serious power.
https://1drv.ms/i/s!AmzmftzD-V0mhxAmNNnC8mYI4bKC
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