Nickel-Iron (NiFe) Battery Calculator Ah to kWh Battery Charge or Discharge.

All NiFe Batteries Cells are rated at 1.20V DC each, however the Cells initially need to be Condition Charged to 1.65~1.85V each & then Discharged to 1.00V, 3~5 Times, devide 1.85V into your inverters Max. Charge Rate.

NB: Nearly all Hybrid battery Inverters have a Max. 60V DC Battery Charge limit.

So, unless you have a 70V~72V DC Charger, a 48V Battery Bank need to be configured & Charge as follows;

The Recommended Cell Charge Rate 1.85V DC, to Condition the Batteries for the First 3~5 Charges or Batteries Left Flat;
After Battery Conditioning all the Battery Cells, the recommended Max. Cell Float Charge Voltage is 1.48V~1.50V DC;
38x Cells Float Charged to 1.5V each = 57V DC Energy Storage.
39x Cells Float Charged to 1.5V each = 58.5V DC Energy Storage.

You can only change the RED cells.

Ampere Hour into Kilowatt Hour Electrical Unit Conversion:

Battery/Cell Rating (Volts):

Volts

NiFe Cells need to be Charged up to 1.55V each (eg. 38 x 1.55V=58.9V)

Battery/Cell Capacity:

= =

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. 80% DOD =0.80 C rating recommended)

Charge/Discharge Load:

Ah To Calculate Ah, Set the Wh Cell to your Discharge or Charge Rate !

Charge/Discharge Load:

Wh Single Phase Power is 3'600W = 3.6kW (e.g. 240V x 15A).

Battery's "C" Load:

Marketing term for Charge/Discharge.

Battery Load Time:

Hours to Charge or Discharge. Minutes to Charge or Discharge.

Battery Load Time is Calculated on 100% Depth Of Discharge (DOD), for 48V~51.2V System that will be 40V.

Discharge Formulas;

Discharge time is basically the Ah rating ÷ Applied Load.

Charge Formulas;

Example: Battery Ah x Battery Voltage ÷ Applied Load.

So, for a 1'200Ah 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 example, NiFe using Solar this could typically be <65% of the Ah rating for 4~6 hours. Other chemistries, such as LiMh batteries will be different.

Say, 1'200Ah x 48V÷1000 Watts =12 hrs (with 40% loss at the Max. = 48x36÷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.

Watt hours	÷	Volts	=	Amp hours	\|	Capacity	÷	Load	=	Battery life
(V)	÷	(V)	=	(Ah)		(in Ah)	÷	(in A)	=	(in h)


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