Use Renogy inverter when you have a battery that is stationery and is installed properly and use a solar generator when you want power that is portable. Make sure that you select an inverter that is big enough for the things you wish to connect to the inverter.

If you want to get an estimated number of what your device takes then use my sheet here

Renogy Inverter comes with different sizes and functions, select the one that suits you best and read more on Renogy website