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To determine the battery size of the 3000w inverter, you first need to know how much power you will consume every day, and then perform calculations. The general rule of batteries is that the lower the depth of discharge, the longer the service life.

How large is the battery for the 3000w inverter charger, and the total number of inverters and batteries

  • Xindun
  • November 11, 2020

To determine the battery size of the 3000w inverter charger, you first need to know how much power you will consume every day, and then perform a simple calculation according to the following steps. The general rule of batteries is that the lower the depth of discharge, the longer the service life.

Step 1: Calculate your daily power consumption (Wh) by adding the power consumption of each electrical device to be used. You can calculate the daily power consumption by multiplying the devices rated power by the number of hours of use. If the device does not declare power consumption (watts), multiply the current in amperes (A) by the operating voltage (V). For example, an electrical appliance with a total power of 3000w used for 1 hour per day = 3000Wh per day

Step 2: Determine how many days of backup power is needed, and then multiply the number of power consumption in the first step by the number of backup days. For example, 2 days backup time: 3000 x 2 = 6000 Wh

The third step: As mentioned earlier, the battery is discharged as little as possible to achieve the longest service life. Determine the maximum depth of discharge (DOD), and then divide the result of step 2 by this value (minimize). For example, you decide that the DOD is 50%: 6000/0.5 = 12000 Wh


How large is the battery for the 3000w inverter charger, and the total number of inverters and batteries


Step 4: All batteries have lower efficiency at lower temperatures, and we can compensate for this in the calculation. Select the coefficient corresponding to the lowest average temperature at which the battery will work. Multiply the result of step 3 by this number. Assuming the coefficient is 1.05, 4800 x1.05 = 12600 Wh

Step 5: According to the voltage of the system, connect the batteries together to create a 12V, 24V or 48V battery pack. Divide the result of step 4 by the required battery voltage, for example 12600/12 = 1050Ah

Step 6: Determine how many batteries are needed. If you want to create a 12V1050Ah battery pack with a 12V105Ah battery, you need the number of batteries: 1050/105= 10 pieces.

The above is the calculation method of the theoretical value of "how much battery is equipped with inverter 3000w". If you find the calculation is complicated, or want to obtain a more intuitive battery capacity and quantity value, please contact Xindun directly.

Xindun dp series 3000w pure sine wave inverter 18kg, 7-250AH lead-acid battery 2.1-69kg. Different styles of inverters and different types of batteries have different weights. If necessary, please consult with pictures.