Controller recommendation

[harryS]

It's always cleaner when you start a new thread. People will try to respond to the first poster and never get to your post.

It reads like you had a 17.5AH battery that would shut down on your trike, but you have a bigger BTR pack that runs it OK now. I replied that you don't need to change the controller because it has its own current limiter.

Now you're saying you took the BMS card out of the old battery and you want a new one? The old one was shutting down because the cells were not strong enough to run the big hubmotor, If you put in another BMS. the same thing will happem and it will shut down.

You probably know it's unsafe to run a battery without a BMS circuit. It's extremely dangerous. There's nothing to shut off the battery if cells get too low. Nothing to shut them off if the batteries gets unbalance, You can have a pefrectly good charger, but it will overcharge cells if the battery gets unbalanced. It's a serious fire risk. Don't do it,

Well, I appreciate the answer about trikes cornering. I thought about building one for a lady I know that can't bakance a regular bike, but I think she would flip it, unless I limit the speed to 8 mph,

 

[harryS]

You got a lot of reading to do, Michael. The S refers to the number of cell groups in series. Each cell group is 3.6V at nominal charge so 10S is 36V and 13S is 48V, while 16S is 60V. You can't change the S because that's a physical constraint of the battery, how many cell groups it has.

A BMS is a circuit card, not a chip. A chip is a component on the circuit card, Again, you were told wrong about replacing the BMS. When they do their job right, the battery shuts off. And that's because the cells get worn out, especially on smaller batteries being asked to spin a big motor up past 22 mph. And when they wear out, you can't bring them back. They get unbalanced and shut down early.

My advice is to take some pictures of what wires broke on that first battery and go to a place like endless sphere where you will get advice on whether you can put those broken wires bacl on.