#1
Battery Capacity Calculator
Calculate required battery capacity in Ah, Wh, and kWh using load power, runtime, voltage, efficiency, depth of discharge, ageing, and reserve.
#2
Battery Charge Time Calculator
Estimate battery charging time from capacity, voltage, starting charge, target charge, charger amps or watts, efficiency, and charging taper.
#3
Electrical Horsepower Calculator
Electrical Horsepower Calculator finds motor HP or current from volts, amps, efficiency and power factor for DC, single-phase and three-phase systems.
#4
Inductor Calculator
Inductor Calculator finds reactance, inductance, stored energy and RL time constant with unit conversion and clear formula steps for circuit analysis.
#5
Parallel Resistor Calculator
Calculate equivalent resistance for parallel resistors in ohms, kilo-ohms, or mega-ohms. Add voltage to find total current, power, and branch currents.
#6
RC Time Constant Calculator
RC Time Constant Calculator finds tau, charging and discharging voltage, cutoff frequency and response time from resistance, capacitance, voltage and time.
#7
Series Resistor Calculator
Calculate total resistance, circuit current, voltage drops, and resistor power for series circuits with mixed ohm, kilo-ohm, and mega-ohm values.
#8
Solar Battery Size Calculator
Calculate solar battery bank size in kWh and Ah using daily energy use, backup days, voltage, depth of discharge, efficiency, and reserve.
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