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What are the formulas to do the battery charger sizing calculation?

What are the formulas to do the battery charger sizing calculation?
03 Nov 2021

From our long experience of providing industrial battery charger solutions to our customers and partners, we have seen that there are some basic questions that are always asked. One of the basic questions we are always asked by our valuable customers is “what are the formulas needed to do the battery charger sizing calculations?” Here we are sharing the basic formulas for your convenience. .


CHARGER SIZING FORMULAS:
1. Calculating charger requirements
A = 1.1C / H + L
2. Calculating hours to recharge
H = 1.1C / A - L
3. Calculating charger losses (BTUs)
BTUs PER HOUR = ((1 / EFF) – 1) x Wdc X 3.42
4. Calculating charger input current drain:
Single-Phase chargers
IIN = EOUT x IOUT / EIN x EFF x P.F.
Three-Phase chargers
IIN = EOUT x IOUT / EIN x EFF x P.F. x √3
Here,
A = DC output rating of charger in amperes
1.1 = Efficiency factor to return 100% ampere-hours removed from a lead-acid battery. Use 1.4 for NiCad batteries.
C = Calculated number of ampere-hours discharged from battery. (Time in hours x load)
H = Number of hours recharge time
L = Load on system in amperes
Wdc = Output volts x output amperes
IIN = Input current (amperes ac)
EOUT = Output voltage (volts dc)
IOUT = Output current (amperes dc)
EIN = Input voltage (volts ac)
EFF = Efficiency (e.g. 88% = 0.88)
P.F. = Power Factor (E.G. 92% = 0.92)
√3 = 1.7321

Conclusion:
EverExceed has a vast experience when it comes to industrial charger solutions, and we are satisfying our partners and customers pain points with the most efficient and precise state of art rectifier charger solutions consistently. If you have any requirement or any kind of query regarding the customized power solution, feel free to communicate with our dedicated team at any time.

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