photo sharing and upload picture albums photo forums search pictures popular photos photography help login
Compass Marine How To | all galleries >> Welcome To >> LiFePO4 Batteries - Thoughts & Musings > LFP Cycle Life
previous | next

LFP Cycle Life

This is one of the few tests I have seen on an LFP battery where they took it to 100% DOD every cycle.. The cells were made by GBS and the cycle tests were to 100% depth of discharge. The tests were conducted at room temperature and the cell was discharged at a .5C load or 20A on a 40Ah cell.

At 2000 cycles, to 100% DOD, these cells were still putting up 35Ah's or just 5Ah's shy of the as new capacity rating. Even for a lab type test this data is quite amazing. As I always suggest though, take this "lab data" with a grain of salt because a test like this ignores real world temperature effects as well as calendar life degradation. In the real world the cycles are done much slower and if your regular battery temps are in excess of 80F I can guarantee you will never get or see data like this in the real world.

Image Courtesy: Elite Power Solutions

other sizes: small medium original auto
Guest 02-Mar-2015 14:03
Hello, really enjoyed your excellent article. Do you oversee the entire lithium , solar panel, charging process from A to Z ?
Would you be interested in doing this on a new build catamaran?
Thank you
Jeffrey Phillips
Marc Dacey 25-Aug-2014 15:08
RC, this is great stuff. Not just for the cutting-edge information on LiFePo battery banks and their related dos and don'ts, but for the important information on field-testing one's battery regulation with real-life (inverter and heat gun is pretty real!) loads and temperature sensing. That's applicable in any battery regime, as you point out, to see it as a total system and not just a big well in which one can shovel amps. I was led to this article from Panbo, as I know people such as yourself like to track such things. On a side note, I did purchase an FTZ crimper and Power Lugs, and they are indeed the right tools and supplies. Thanks again for all your informed work and sharing nature.