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Monday, 20 April 2018 08:88

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1. Lithium-Iron (LiFePo4) Battery Calculator 

Other Battery Calculators
(LiFePo4) (NiFe) (Lead)

This calculator to set to 2x 5.2kWh (10.4kWh) LiFePo4 Batteries !

You can only change the RED cells.

Ampere Hour To Kilowatt Hour Electrical Unit Conversion:

Battery Rating (Volts):
Battery Capacity Rating:
Ah   (Ah =Amp-hours)    (Wh =Watt-hours)
Batteries or Banks in Series: Series Wiring  (-/+ Doubles Voltage, Same Capacity)
Batteries or Banks in Parallel: Parallel Wiring  (+/+ Same Voltage, Doubles Capacity)
Total Batteries in System:
Batteries Bank Voltage DC:

System Stored Energy:

Battery Bank Energy Wh:
 (Wh =Watt-hours)   (Ah =Amp-hours)
Battery Bank Energy kWh:  (1'000 kW = 1 MW)   (1 MW = 1'000 KW)

Battery Bank Charge/Discharge Time:

Battery's "C" Rating: "C" Rating  a Marketing term for Charge/Discharge.
Charge/Discharge Load: Amps  Set this Cell to your proposed Amps Usage or Charge Rate !
Battery Load Rate: Hours to Charge or Discharge. 
Battery Load Rate: Minutes to Charge or Discharge. 

Discharge Formulas;

Discharge time is basically the Ah rating divided by the current.

Charge Formulas;

Example: Battery AH X Battery Volt ÷ Applied load.

So, for a 1200Ah battery with a load that draws 30A you have: #1200÷30 =40 hours.

The charge time depends on the battery chemistry and the charge current.   For NiFe, for example, using Solar this could typically be <65% of the Ah rating for 4~6 hours.   Other chemistries, such as LiFe & LiMh batteries will be different.

Say, 1200Ah x 48V÷1000 Watts =12 hrs (with 40% loss at the max = 48x40÷1000 =1.92 hrs).

For sure, the backup may lasts up to 4.8 hrs at 100% efficiency.

#1200mAh is the same as 1.2Ah. 300mA is the same as 0.3A

  • Wh = Ah x Voltage, where 1kW = 1000W.
  • "C" Rating is the Battery Charge or Discharge Rate.
Volts  x  Amp hours  =  Watt hours
(V) x (Ah) = (Wh)
Capacity  ÷  Load  =  Battery life
(in Ah) ÷ (in A) = (in h)
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