No only ON when needed to use -ie when you have no electrical hookups. Your inverter takes 12V battery stored power and converts it to 110V so things like your TV can be used off battery power. Beware of using things that draw a lot of power so you don’t discharge your batteries to less than 50% before recharging(lithium batteries recharge level is different) . Inverters are great but just beware of your stored battery capacity and usage. We use ours when boondocking but monitoring is key to long term success.