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Lithium Ion Vs. Lead Acid
Invees-Admin August 2, 2021 Blog 23

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

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