I use these Go Power Inverter, link to Amazon below. The smallest, 175W, is fanless, no noise, but won't run much. With an inverter you need to know what load you are going to run on it. For example a laptop power brick. On the back of the brick it will say what the input values are in Volts and Amps. Volts x Amps = Watts. Once you know your power needs you can pick the invterter you want. It is a good idea to pick an inverter that can supply twice the needed watts. So say 110V at 2 amps = 220 watts, I would then consider getting the 600 Watt inverter, but would also consider the 300w if I was feeling tight on funds and didn't want to spend for the bigger one.
One thing that I have experienced though is that the 12v connection needs to be in very good contact with the source. If not, the inverter will not get the power it needs to run properly and will sound the alarm and turn off.
Hope that helps in picking out an inveter.
Brian
Amazon link to the Go Power inverters.
https://smile.amazon.com/s/ref=nb_sb...power+inverter