Pasha said:Thanks litespeed for your reply. My question is that would it be better to use two 10AWG(ampacity ~120amps) copper for serial connections or pure nickel from each cell to to next cell in the parallel group.
goatman said:have you looked at the very first post of this thread, I think its docbass's chart on current flow through a pack and where to do the serial connections?
https://endless-sphere.com/forums/viewtopic.php?f=14&t=84412#p1235095
4p? do you mean 40p instead of 60p?
goatman said:I was actually hoping to learn from what youre doing, and am trying to understand, maybe someone else will jump in here.
The size (gauge, square millimeter area, etc) of serial connection you need doesn't depend on the number of parallel cells.Pasha said:Since my one parallel group of cells will be consisting of 60 cells so running two cables for serial connections will be enough?
amberwolf said:The size (gauge, square millimeter area, etc) of serial connection you need doesn't depend on the number of parallel cells.Pasha said:Since my one parallel group of cells will be consisting of 60 cells so running two cables for serial connections will be enough?
It depends on the specific amount of current you want flowing continuously, and peak, thru them.
So what is the peak and continuous expectation you have for the completed pack itself?
If they're hidden away where there is no airflow, and bundled together or very close to each other where heat from one is also affecting the other(s), then depending on the chart you look at, typically 10g wire might be good for 20-50A continously, depending on the insulation type, and the length of the run. Shorter the run, the more current it could handle. More airflow, more current.
So a pair of them inside the battery where all the heat is contained and held in, but where the wires can pass their heat into the battery cells (assuming the cells themselves wont' heat up due to using them too close to their ratings), and at most a few feet long, you could probably put 100A thru them continuously. Maybe more, depends on your conditions and the actual wire in question.
Also depends on how you crimp those J-hooks to the series cables themselves. If it's a really good crimp, they won't add significant (or even noticeable) resistance. If it's a bad crimp, then it depends on how bad the resistance is, and how it grows worse over time. If it's soldered, it depends on how good a mechanical connection you started with (a good crimp will be better), and the solder itself if it's a poor mechanical connection.
Pasha said:amberwolf said:The size (gauge, square millimeter area, etc) of serial connection you need doesn't depend on the number of parallel cells.Pasha said:Since my one parallel group of cells will be consisting of 60 cells so running two cables for serial connections will be enough?
It depends on the specific amount of current you want flowing continuously, and peak, thru them.
So what is the peak and continuous expectation you have for the completed pack itself?
If they're hidden away where there is no airflow, and bundled together or very close to each other where heat from one is also affecting the other(s), then depending on the chart you look at, typically 10g wire might be good for 20-50A continously, depending on the insulation type, and the length of the run. Shorter the run, the more current it could handle. More airflow, more current.
So a pair of them inside the battery where all the heat is contained and held in, but where the wires can pass their heat into the battery cells (assuming the cells themselves wont' heat up due to using them too close to their ratings), and at most a few feet long, you could probably put 100A thru them continuously. Maybe more, depends on your conditions and the actual wire in question.
Also depends on how you crimp those J-hooks to the series cables themselves. If it's a really good crimp, they won't add significant (or even noticeable) resistance. If it's a bad crimp, then it depends on how bad the resistance is, and how it grows worse over time. If it's soldered, it depends on how good a mechanical connection you started with (a good crimp will be better), and the solder itself if it's a poor mechanical connection.
Thanks amberwolf for jumping in. Peak current draw would be max 100amps or 3500watts from this 10S60P (two 5S60P connected in series through XT150 connectors). And I would keep the airflow open keeping two sides of the packs open. 10awg silicon tinned copper wire which I am going use is good for 120amps.
hemo said:10s 60p we are talking 600 cells here yes or is this a typo ?
A theoretical 600a current draw.
hussman said:Please correct me if im wrong, but in the case of a building a high capacity high discharge battery pack. Would this be the best way to build the pack to be able to handle the high current, deliver the high current, and keep the battery pack 'cool'.
25mm.jpg
hussman said:Please correct me if im wrong, but in the case of a building a high capacity high discharge battery pack. Would this be the best way to build the pack to be able to handle the high current, deliver the high current, and keep the battery pack 'cool'.
hussman said:Please correct me if im wrong, but in the case of a building a high capacity high discharge battery pack. Would this be the best way to build the pack to be able to handle the high current, deliver the high current, and keep the battery pack 'cool'.
25mm.jpg
On how many spots did you solder the busbar on the nickel? I'm working on a similar setup.fechter said:Img_1098A.jpg
nardcox said:On how many spots did you solder the busbar on the nickel? I'm working on a similar setup.
fechter said:nardcox said:On how many spots did you solder the busbar on the nickel? I'm working on a similar setup.
It is soldered continuously along the length. It took a lot of solder. I used hemostat clamps to hold the copper against the nickel during soldering.