No. Probably somewhere around 2 1/2 hours. Much depends on the true specs that are usually not given by the manufacturer.
You lose 5%-10% efficiency though the inverter and only get 75% efficiency from the battery. Then you have to figure the AH rate of the battery figured at a low of 11.8 volts. So, you need to know how many amp hours your battery can supply before if drops to 11.8 volts and your inverter shuts off.
The problem is, amp hour rates are not very useful unless more info is given, and it usually isn't. An AH is supposed to be expressed with the "rate of hours", and most companies leave that info out.
Some of the best power packs with built-in inverters have 28AH batteries that can run a 100 watt light bulb for 2 to 2 1/2 hours.
I have an exact formula for figured actual usefullness of inverters hooked to battery banks, but the formula only works with accurate data to input.
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