What size power station do I need for Phone charging?

The supplied baseline estimates phone charging at 12 W for 3 hours per day, or about 36 Wh/day. It gives a conservative one-day battery target of approximately 52 Wh nominal capacity.

The listed running and surge demand are both 12 W. Usage carries an uncertainty of ±20%; model-specific energy use and actual runtime cannot be established from the supplied evidence, and no hands-on testing was performed.

• For this default one-day profile, look for at least about 52 Wh of nominal battery capacity.
• Ensure the power station can supply at least 12 W for the charging load and its listed surge demand.
• For greater accuracy, use a plug-in power meter or the phone charger’s manufacturer energy information when available.

Using the default load profile, phone charging consumes about 36 Wh/day. A conservative one-day battery target is about 52 Wh nominal capacity, while the inverter should cover at least 12 W of startup demand.

Assumptions behind the calculation

• Running draw: 12 W
• Startup/surge: 12 W
• Default use: 3 h/day
• Duty cycle: 100%
• Usage uncertainty: ±20% before model-specific measurements

Actual energy use varies by appliance model, ambient conditions, settings and load. A plug-in power meter or manufacturer energy label is preferable when available.

Runtime by battery size

Station capacity	Continuous-draw runtime	Default usage profile
300 Wh	19.8 h at continuous draw	6.6 default-profile days
500 Wh	33 h at continuous draw	11 default-profile days
1000 Wh	66 h at continuous draw	22 default-profile days
1500 Wh	99 h at continuous draw	33 default-profile days
2000 Wh	132 h at continuous draw	44 default-profile days
3000 Wh	198 h at continuous draw	66 default-profile days

Use your actual household loads

The calculator combines this appliance with refrigerators, networking, pumps, medical equipment and other essentials so simultaneous wattage and motor startup are not ignored.

Size my complete backup setup