How it Works – Generator Amps Volts for Power
A portable generator supplies electric current (amps or amperes) at 120 and 240 volts. Electricity is the flow of electrons through a conductor.
Inverters with a greater DC-to-AC conversion efficiency (90-95%) draw fewer amps, whereas inverters with a lower efficiency (70-80%) draw more current. Note: The results may vary due to various factors such as inverter models, efficiency, and power losses. Here is the table showing how many amps these inverters draw for 100% and 85 % efficiency.
Now, maximum amp draw (in amps) = (1500 Watts ÷ Inverter's Efficiency (%)) ÷ Lowest Battery Voltage (in Volts) = (1500 watts / 95% ) / 20 V = 78.9 amps. B. 100% Efficiency In this case, we will consider a 48 V battery bank, and the lowest battery voltage before cut-off is 40 volts. The maximum current is, = (1500 watts / 100% ) / 40 = 37.5 amps
When the discharge is maximum, around 10 volts of the battery gets drained. As per the direct calculation, when the power of the inverter is 100 watts and the voltage is 12, the amperage will be, 100 watts / 12 volts = 8.33 amps. Usually, the efficiency of a 100-watt inverter is within 80% to 95%.
In the case of 4000 watts power of an inverter, if we take 12 volts as the voltage of the inverter, then the number of amps the inverter will draw will be 4000 watts / 12 volts = 333.33 amps with 100% efficiency. However, there is a good possibility that your inverter has a battery with a voltage of more than 12 volts.
For 12 volts, the amperage of the inverter will be 1000 watts / 12 volts = 83.33 amps with 100% efficiency. As you already know, an inverter hardly ever has a 100%, we will calculate its amps with 85% efficiency. Because usually, 1000 watt inverters have 85% efficiency.
So, the amps of the 3000-watt inverter in 120 volts will be 3000 watt / 120 volts = 25 amps. Now, time to calculate the amps of the 3000-watt inverter with 85% efficiency. With 85%, the amps of the 3000-watt inverter with 120 volts will be 25 amps / 0.85 = 29.4 amps approximately. How many amps does a 4000 watt inverter draw?

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