If it operates at 120 volts, the amperage would be 41. 83 amps (5000 watts ÷ 240 volts = 20. 85% Efficiency Let us consider a 12 V battery bank where the lowest battery voltage before cut-off is 10 volts. 8 volts, as that is what it stores when it is fully. . To convert watts (electrical power) to amps (electrical current) at a fixed voltage, you can use a variation of Watt's Law formula: Power = Current × Voltage (P = IV). The current I in amps (A) is equal to the power P in watts (W), divided by the voltage V in volts (V): The phase current I in amps (A) is equal to the power P in watts (W), divided by the power factor PF times the RMS voltage V in volts. . The number of amps your inverter draws depends on its size. Your inverter might differ slightly, but the figures will be in this region: If you have a 1,000W 12V inverter, you can expect it to use between 88 and 105. .
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