For a 357-watt laser printer, you'll need a power inverter with a continuous output rating of at least 1071 watts.

Here's why:

• Surge Power: Laser printers, especially during startup, can draw significantly more power than their rated wattage. This is called "surge power."
• Inverter Sizing Rule: A common rule of thumb is to size your inverter to handle at least 3 times the continuous wattage of the device you're powering.

Important Considerations:

• Pure Sine Wave: Laser printers generally require a pure sine wave inverter for proper operation. ¹ Modified sine wave inverters can cause issues with sensitive electronics. ¹