Cellphone. How Much Power for a Mobile, Marine, and Off-Grid Electrical System?
24 March 2024 · 8 min · 6K views
What this video covers
Calculating the daily power consumption of a mobile device requires identifying its internal battery capacity in watt-hours and multiplying that figure by the number of full charge cycles performed per day. Standard power meters often fail to provide accurate data for devices like smartphones or portable speakers because they only measure current during active charging, not the total energy capacity of the battery. To determine capacity, search for the device's specifications online to find the watt-hour rating.3:02 If only milliamp-hours and voltage are available, convert milliamp-hours to amp-hours by dividing by 1,000, then multiply by the battery voltage to reach the watt-hour total.3:48 For an iPhone 15 Pro, this results in approximately 12.7 watt-hours per full charge.3:26 When sizing an off-grid electrical system, this daily load represents a small but cumulative draw on the main battery bank. For example, a 12.7 watt-hour charge cycle consumes roughly 1.06 amp-hours from a 12-volt, 100 amp-hour battery.6:16
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