TXT lithium/controller/lift kit recommendations

[Warden902]

Originally Posted by Aaviator

Thanks!

You are welcome! Here is a picture of my cart. You can see how steep my driveway is behind it. At full throttle, It eats it up.

EZ1.jpg

[PuttPutt]

Originally Posted by Aaviator

Why is that? I see companies selling drop in lithium replacement batteries for golf carts. Presumably they all have separate BMS on each battery. What's the issue?

While it may seem that paralleling multiple strings would increase the overall reliability of a battery pack design, in reality, the opposite is usually true. Unlike lead-acid cells which are commonly assembled in parallel strings, lithium cells are very intolerant of over charge and over discharge. Since lithium cells must be managed on a cell level, parallel lithium strings dramatically increase the complexity and cost of the battery management and introduce many additional points of failure and failure modes not found with a single string. A parallel string topology almost always leads to a lower overall usable capacity and lower maximum power output. A single weak or bad cell can exponentially lower the capacity of the entire battery pack. A properly engineered system can improve the overall reliability, but only when additional equipment and significant engineering time is invested. Whenever possible, a single string set-up should be considered.

wish I was smart enough to write that but credit goes to
http://www.orionbms.com/manuals/pdf/...el_strings.pdf