Lithium Ion Vs. Lead Acid
Lithium Ion
Charging: 0.1C, 0.2C, 0.3C, 0.5C, 1C
Discharging: 0.1C, 0.2C, 0.3C, 0.5C,1C
Typical charging curve vs temp. rise
Typical lifecycle Curve
Interesting fact: When you set charging and discharging cut off voltage for battery, you can extract more kWH if you discharge slower rate.
Lead Acid battery
Charging: C/10, C/20
Discharging: C/10, C/20
Typical lifecycle curve C/10 -60 moths warranty battery
C/10 definition:
C/10 = Battery charging and discharging time specified as 10 Hrs.
For example, 150AH, C10 battery can be charged or discharged @ 15A to get recommended battery life by OEM
C/20 definition:
C/20 = Battery charging and discharging time specified as 20 Hrs.
For example, 150AH, C20 battery can be charged or discharged @ 7.5A to get recommended battery life by OEM
Corelation:
C/10 of Lead acid = 0.1C of Lithium
C/20 of Lead acid = 0.05C of Lithium
No lead Acid battery is available compare to 1C of Lithium
Lead acid battery life and capacity calculation:
If you use 150AH C/10 long life battery (60 months) for 3kVA 48V solar system.
C/10 Charging /discharging current = 15A
Charging /Discharging power = 720VA (W)
That means in “inverter mode” you should use only upto 720W to get the recommended battery life. Which is equivalent to 25% of useable capacity.
Lithium battery life and capacity calculation:
If you use 100AH lithium battery for 3kVA 48V solar system.
C1 Charging /discharging current = 100A
For 3KAV 48V you need 62.5A max to extract 3kVA
That means in “inverter mode” you can use upto 3kVA to get the recommended battery life.
Comparison summary
