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Hello iPad3,
Short answer is yes, it is fine to leave the printer on for extended periods of time (days, even weeks). To conserve electricity, the printer comes with the following features:
Sleep mode
Power usage is reduced while in Sleep mode. After initial setup of printer, the printer will
enter Sleep mode after 5 minutes of inactivity.
To change the setting, complete the following steps:
1. Open the EWS. For more information, see Embedded web server.
2. Click the Settings tab.
3. In the Preferences section, click Energy Save Mode and select the desired option.
4. Click Apply.
Auto Power-Off
Auto Power-Off is automatically enabled by default when you turn on the printer. When
Auto Power-Off is enabled, the printer will automatically turn off after 8 hours of inactivity
to help reduce energy use. Auto Power-Off is automatically disabled when the printer
establishes a network connection. You can change the Auto Power-Off setting from the
printer software. Once you change the setting, the printer will maintain the setting that
you choose. Auto Power-Off turns the printer off completely, so you must use the power
button to turn the printer back on.
Windows: Open Toolbox. In theAdvanced Settings tab, click Change, and then select the preferred amount of time.
Mac OS X: Open HP Utility. In the Printer Settings section, click Power Management, and then select the preferred amount of time.
TIP: If you are printing through an Ethernet connection over a network, Auto PowerOff should be disabled to ensure that print jobs do not get lost. Even when Auto PowerOff is disabled, the printer will enter a Sleep mode after 5 minutes of inactivity to help
reduce energy use.
This information (and more) is found in the online User Manual located at the link below:
http://h10032.www1.hp.com/ctg/Manual/c02948312.pdf
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