How to calculate the required battery Capacity and Power?

Capacity (Wh) is the energy stored in a battery. Wh is Watt x hour.

Power (W) is the speed of drawing the stored energy. W is Watt.

Maximum Power (W) is indicated at the specifications of your battery. All devices you power from the battery together must not draw energy faster than the Maximum Power limit.

For example,

Globalmediapro Li160S V-Mount Battery has Capacity of 160Wh and Maximum Power Draw (Power Limit) of 79W.

A camcorder draws 30W, and camera light draws 20W. Combined draw is 30 + 20 = 50W.
You can use the Li160S battery to power the camera and light because the combined draw 50W is less than 79W.

The 160Wh battery will last for approximately 160Wh / 50W = 3.2 hours.

To power the 50W system for 5 hours, you would need Capacity of 50W x 5 hours = 250Wh.

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