Hello, I have a question, I've googled to find the answer but I didn't find any. I have 12v 100amp battery, 12v-220v 300watt inverter and 220w 220v appliance. I want to run the 220w appliance on the 12v battery by using the inverter. My Question is: How long will it last until the battery is fully discharged? Please write the equation so it will help me in the future, Thank you.