What is the correct resting lifepo4 voltage?
I bought a Enjoybot 100ah lifepo4 battery when they were $349..The resting voltage after 24hrs was 13.30 without a load..Back and forth with the seller was interesting,so I decided to do a capacity t...
Forum Discussion
We've done a number of deep discharge SOC tests with our 200ah lifepo4. Found the following chart reasonably accurate as long as there is no dynamic charge voltage or load voltage sag present. BTW, this chart contains the same voltage/SOC data as the BB chart in BFL13's link.
Note, there's two voltage readings (13.6v and 14.4v) that reference 100% SOC in this chart. We found this to be true when the converter is on (in 13.6v absorption and/or 14.4v bulk mode), *and* little (<.1a) to no charge current is flowing.
This chart and personal testing has confirmed our decision to keep our 3-stage (13.2v/13.6v/14.4v) lead cell converter to charge our lifepo4 (vs. using a lithium/lifepo4 1-2 stage 14.6v converter). Zero chance of overcharging, plus for all practical purposes we're still able to charge our lifepo4 to 100%.
I might add we did try charging our lifepo4 with our our dc to dc charger at 14.6v (vs. 14.4v) several times. Discovered it provided no noticeable difference in available ah (or SOC), vs. charging at 14.4v.
Note, there's two voltage readings (13.6v and 14.4v) that reference 100% SOC in this chart. We found this to be true when the converter is on (in 13.6v absorption and/or 14.4v bulk mode), *and* little (<.1a) to no charge current is flowing.
This chart and personal testing has confirmed our decision to keep our 3-stage (13.2v/13.6v/14.4v) lead cell converter to charge our lifepo4 (vs. using a lithium/lifepo4 1-2 stage 14.6v converter). Zero chance of overcharging, plus for all practical purposes we're still able to charge our lifepo4 to 100%.
I might add we did try charging our lifepo4 with our our dc to dc charger at 14.6v (vs. 14.4v) several times. Discovered it provided no noticeable difference in available ah (or SOC), vs. charging at 14.4v.
