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I have a question, How can I calculate the working time for the following scenario:

I have

**12V 7.2AH LEAD ACID SLA DEEP CYCLE BATTERY**

Then I used

**DC 12V to AC 220V Power Inverter USB 1000W**to give me AC

I connected one 100w lamp .. For how long it will work ? how can I calculate it

another question .. How can I calculate the watt of the inverter (to know which one I should buy) .. is it 220v x amp ? or 12v x amp ?

thanks