LifePo4 Voltage at .5C - .6C Discharge
Our two GC2's (with 100% charge) drop below 12v while under a 100a - 125a load. When they reach 50% (at 100a - 125a), voltage drops into the low 11's while under-load. What kind of under-load volt...
Forum Discussion
pianotuna wrote:
Hi BFL13,
As a battery discharges the voltage starts to drop.
By the time it reaches 50% of the amp-hours, voltage is some what lower than it was at 75% state of charge.
When the battery reaches 10% state of charge voltage is again lower.
Since watts are the product of amps X volts, and the voltage is lower--there is less energy in watt-hours remaining, even though the amp-hours are at 50% of full.
I started a thread on Battery Monitoring basics that shows some graphs to help bend your mind around this.
I know you hate watts--but watt-hours are a better measurement of energy than amp-hours.
when they wredoing the capacity tests on LFP batteries they found the amps went up in relation to the volatage going down, so that would suggest the capacity remains constant going by watt-hours.
Steve
