How to select appropriate parameters for purchasing portable power station?

① outdoor short-term digital applications, mobile phones, tablets, cameras, laptops and other outdoor office photography crowd, small power 300-500w, power 80000-13000mAh (300-500wh) products can meet.
② Long-term outdoor travel, boiling water, cooking a meal, a large number of digital, night lighting, and audio needs. It is recommended that the power of 500-1000, and the power of 130000-30000mAh (500-1000wh) products can meet the needs.
③ Emergency, lighting, mobile phone digital, notebook, 300W-1000w can be used for household power failure, depending on actual needs.
④ For outdoor operation and simple construction operation without mains power, it is recommended that more than 1000w and more than 270000mah (1000wh) can meet the requirements of general low-power operation.