In order to understand why an inverter is needed, let's look at the principle of operation of the device. This device allows you to convert 12 or 24 volts DC to 220 volts AC. Thus, you get electricity like in a socket, and since this inverter is a pure sine wave, you can connect household appliances, computers, laptops, charge phones and much more to it.
As a result, in conjunction with the battery, you get your own power plant, which can be used when the lights turn off in an apartment or house, in the country or on a hike. Charge phones to watch TV use a computer or laptop. Save food by turning on the refrigerator.
I bought this pure sine wave inverter here
To replenish the charge in the battery, you can use a car charger to charge it from a wall outlet, or buy solar panels and a charge controller and get energy from them. In this case, you will get a solar power plant.
The inverter itself is included in the delivery set, they are available for 12 and 24 volts, input voltage and power: 2000, 3000, 4000, 5000 watts. The more watts the purchased device has, the higher the power devices can be connected. For example: a kettle, a slow cooker, a washing machine, a drill, a hammer drill, a grinder, and the like.
There are also two additional fuses, battery terminals with the possibility of attaching a cable, nuts with a cap and two cables. One red for connecting to the plus of the battery and the inverter and the second black for connecting to the minus.
There are two displays on the front panel, one shows the battery voltage, the second shows the output voltage. This data may vary, depending on the level of charge and the connected load. There is also a socket for connecting appliances for 220 volts and an inverter switch. As well as two LEDs, green indicates that the inverter is on, and red that an error or overload has occurred.
On the rear panel are contacts for connecting the battery with a cable and two fans for cooling the system, they turn on when the load exceeds a certain level. The body is completely metal.
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I bought this pure sine wave inverter here