Low Voltage Cut off for 24v LiFePO4?

[wheelbender6]

I am currently running 24v SLA on my kit (I pedal a lot). To run a 24v LiFePO4 pack, I need a controller with a lower Low Voltage Cut Off to take full advantage? What LVC am I looking for to run 24v LiFePO4?

 

[Gregor]

Most lifepo4 "24v" batteries are actually 25.6v nominal as they are a series of 8x3.2v cells. It is safe to take them down to about 2.7v per cell, so a 21v LVC is about right. If you get a BMS with your new Lifepo4, then its LVC should work 1st before your controller's kicks in. You will like the lower wt. for sure.

 

[arkmundi]

You'll see various numbers proposed, but ultimately its the testing of the manufacturer of their cells and their specifications that matter. The LVC is important on discharge, as exceeding the manufacturer's specifications may lead to irreversible damage. At the cell level, not the pack. Which is why you need something like a Celllog. Its possible that the packs total voltage may seem OK when an individual cell in the pack is not OK. Suggest you procure the data sheet for the cells in your pack if possible. 2.5V to 2.7V is likely OK LVC most of the time, however.