But with nickel strip of that size being good for about 10A continuous and 15A where it starts to get hot all ready, having the connection just at the end would cause the nickel strip just before the connection to the wire to be over its rating right? at 27A with 9p config you are looking at the nickel carrying 3A more per cell adding upgoing towards the wire connection. So ideally you shouldn't have more then 3 cells without a connection that can handle higher loads (in his scenario).DarkRaven said:You can't do that endlessly though, at some point more cells in parallel won't give you more power and just increase the runtime
By the way, you were a bit generous on the main positive connection (and I guess on the main negative one as well). You can do it like that and go all the way down the length of the battery, but you don't need to. It has no beneficial effect. The cells are already connected, you are just providing a bigger connection between the terminals of the cells and it doesn't effect the way current flows through the main wire.
Looks amazing!!garolittle said:So I gave into the temptation for more power. I will soon replace thecomponents on the electric go cart referenced above with the following set up:
I added a 35 amp fuse (rated for up to 58 volts) and I hope to hook everything up to the go kart this weekend. Thanks to those on this forum who have provided advice to me. I really appreciate it. Here are a few photos of the newbattery pack I createdand the motor/charge controller that I will soon install.
- 48V 1000 Watt BrushedMotor with rated current of 26.7 amps
- 48V charge controller
- 14S9P batteriesusing Samsung INR18650-25R 2500 mAh 18650 cells (connected with spot welder using pure nickel strips)
That 48v system will be a lot of fun.
Since you probably want more fun in that gocart then range im guessing you arepushing it pretty hard. That 1000W motor which is as you stated 26.7A all readywill most likelyhave peaks of 2000W, so maybe increase the size of the fuse and the wiring respectively, if you don't want it to pop ( I dont know what you used in terms of wiring)
Of course maybe test it first and see if it does pop, but from my experience with 36V 250webike motors, where technically the current is at 7A, I can tell you they pull 18-24A under heavy load (peaking at 800W). So if you are constantly pulling max power you will likely be above the Amprating of the motoryou mentioned.