There is nothing wrong with connecting a converter to your cigarette lighter or other 12V accessory socket. However, there are limitations to what you can power with that type of connection.
How to Use Your Laptop in the Car – Cigarette Lighter Converter
If the electronics you are trying to connect draw less amps than the cigarette lighter fuse, then the inverter should work fine. That is usually around 10 to 15 amps. If you need more amps, then you will need a different wiring solution.
While cigarette lighter converters are convenient, they all suffer from the same design limitations. Unlike inverters that are wired directly to a car battery (or to a dedicated circuit), a cigarette lighter converter draws power from the cigarette lighter circuit. This means that you cannot connect a load to this type of inverter that draws more current than the cigarette lighter fuse can handle, or the fuse will blow.
Additionally, cigarette lighter circuits can contain more than just a cigarette lighter socket. These circuits often have additional 12V accessory sockets connected to them, and sometimes they also supply power to dashboard lights, the head unit, and other electrical components. If the cigarette lighter circuit in your vehicle has any of these additional loads, it will reduce the amount of power you can draw from an inverter connected to it.
