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3. Lead Acid Battery (LAB) Calculator 

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

Use this battery calculator to convert Ampere hour to Kilowatt hour etc.

You can only change the RED cells.

Ampere Hour To Kilowatt Hour Electrical Unit Conversion:

Battery/Cell Rating (Volts):
Battery/Cell Capacity:
Ah   =  =
Battery/Cells in Series: Series Wiring  (-/+ Doubles Voltage, Same Capacity)
Battery/Cells in Parallel: Parallel Wiring  (+/+ Same Voltage, Doubles Capacity)
Total Batteries/Cells in System:

System Stored Energy:

System Voltage:
System Energy Stored Wh:
 (Wh =Watt-hours)    (Ah =Amp-hours)
System Energy Storage kWh:  (1'000 kW = 1 MW)    (1 MW = 1'000 KW)

Battery Bank Charge/Discharge Time: (max. 60% DOD =0.60 C rating recommended)

Charge/Discharge Load: Amps  Set this Cell to your proposed Amps Usage or Charge Rate !
Battery's "C" Rating: "C" Rating  a Marketing term for Charge/Discharge.
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 110Ah battery with a load that draws 20A you have: #110÷20 =5.5 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   |   Capacity  ÷  Load  =  Battery life
(V) x (Ah) = (Wh)   (in Ah) ÷ (in A) = (in h)
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