Power/Energy Time Calculator

Hi All! I am looking for a calculator for my solar generator? I can find conversion tables, but nothing to calculate the time.

I would like to calculate the time a certain appliance can last on my 200 watt dr prepare solar generator/power station will last.

Thank You!

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Good luck I hope you will post the solution if you find one!

I use the Goal Zero Yeti which actually does tell me how many hours an appliance will run until the battery is empty.