What Should Be Plugged Into a UPS, and What Should Not?

On this page (8 sections)

1. What should be plugged into a UPS?
2. Which devices should stay off a UPS?
3. How do you choose which UPS outlets to use?
4. What should be plugged into a UPS: which model fits?
5. How should you set up and care for a UPS?
6. What mistakes reduce UPS protection or runtime?
7. How can you get more runtime from a UPS?
8. What should you plug into a UPS? Make the decision

Plug your computer, monitor, router, modem, and essential network storage into a UPS battery-backup outlet. For what should be plugged into a UPS, prioritize devices that need time to save work, shut down safely, or keep your connection running through a short outage.

A UPS has limited power and battery capacity, so every connected device is a choice about runtime. Use its surge-only outlets for equipment that needs protection but can switch off when utility power fails.

What should be plugged into a UPS?

Plug essential work and network devices into battery-backup outlets. For a home office, start with the computer, one monitor, router, and modem; add a NAS if it holds files or services you need to protect from an abrupt shutdown.

Include only equipment that has a clear job during an outage. Speakers, spare displays, desk lamps, and chargers can use capacity without helping you save work or stay connected.

If you aren't sure how the outlets differ, first learn what a UPS battery backup does. Many units separate battery-backed outlets from surge-only outlets, so match each device to the protection it needs.

What should be plugged into a UPS for a home office?

For a home office, back up the computer and internet connection first, then add a monitor if you need it to save work or shut down. Network storage belongs on battery power when it needs to stay available or complete a safe shutdown.

The APC Back-UPS BE850G2 suits a compact desk that needs a computer, router, modem, or NAS covered. Its 850VA/450W capacity and stated runtime of up to 35 minutes at a 100W load make it a fit for modest loads and short interruptions, not a promise of long operation at a full desk load.

Choose another capacity if your equipment's combined draw is close to the UPS watt limit, or if you need long backup. For more sizing guidance, read how to choose a UPS battery backup.

What should be plugged into a UPS for a network?

For a network-only setup, plug in the modem, router, and any switch or access point required for your home connection. Keeping just those devices on battery power can preserve Wi-Fi without using runtime on a desktop and monitor.

A UPS dedicated to networking can suit people who work from laptops, rely on internet calling, or need their connection during brief outages. Check that all required network devices are connected; backing up the router alone won't help if the modem loses power.

For a setup focused on connectivity, compare UPS units for a home network. If you also want a desktop protected, count its load before deciding whether a single unit can serve both jobs.

Which devices should stay off a UPS?

Keep high-draw appliances and equipment with heating elements off a small UPS. Space heaters, microwaves, refrigerators, and similar loads can exceed the UPS power limit or drain the battery quickly.

Laser printers also belong on the caution list because their heating cycle can draw a large burst of power. The APC BE850G2 provides surge-only outlets specifically suited to printers, so you can protect one without assigning it battery capacity.

The CyberPower ST900U is a practical option when a compact home office or entertainment setup needs several outlets. Its 900VA/500W rating gives you a defined ceiling, so skip it if your devices exceed that limit or if you need more output capacity.

A UPS isn't a general-purpose extension cord. Keep equipment you don't need during an outage off the battery outlets, even when there is an open socket.

How do you choose which UPS outlets to use?

Use battery-backup outlets for equipment that must keep running or shut down cleanly. Put less critical electronics on surge-only outlets when the UPS has them, and leave high-draw loads off unless the manufacturer approves them.

Check the outlet labels on the unit before plugging anything in. Battery-backed outlets usually provide both backup and surge protection, while surge-only outlets protect against surges but do not keep devices powered during an outage.

The CyberPower ST900U has 6 battery-backup and surge-protected outlets plus 6 surge-only outlets. That split can suit a desk with several accessories, provided the combined load on the battery outlets stays within its 500W maximum.

Before you connect the full setup, check each device's power draw and add the loads you plan to back up. Compare the total with the UPS watt rating, then leave room for normal changes in computer use rather than choosing a unit that sits at its limit.

VA and watts are related but different ratings. Use both when comparing equipment to a UPS; this guide to UPS VA sizing explains how to think about the two numbers.

What should be plugged into a UPS: which model fits?

The right choice depends on the load and the outlets you need. The APC BE850G2 fits a modest home office that needs a mix of battery-backed and surge-only outlets, while the CyberPower ST900U offers more total outlets for a compact desk or entertainment area.

The Tripp Lite OMNI1500LCDT is for users who need more output capacity and want to monitor wattage load and estimated runtime on an LCD. It is rated at 1500VA/810W and includes AVR, which corrects certain brownouts and overvoltages without using battery power.

Choose the Tripp Lite if your equipment needs its higher capacity and you value the display and AVR. Skip it for a small router-only setup where a higher-capacity unit would add size and cost without solving a real need.

If you're comparing this model with another brand, see APC vs Tripp Lite UPS units. For a single desk with a smaller load, 1000VA UPS picks may be a closer match.

How should you set up and care for a UPS?

Set up the UPS where its vents are clear and its outlets and status indicators remain easy to reach. Connect the UPS to a wall outlet, then plug in only the equipment you've chosen for backup, following the unit's instructions.

Start with the computer and network gear. Turn devices on and check the UPS display or indicators for load and battery status; if it signals an overload, remove nonessential equipment before relying on it.

A UPS battery needs periodic care. Check its status indicators and alarms, and replace the battery when the unit reports that it can no longer provide useful backup; the APC BE850G2 and Tripp Lite OMNI1500LCDT both have user-replaceable batteries.

Keep the UPS connected to utility power as directed so its battery can charge. Avoid blocking ventilation, placing it near heat sources, or assuming that a healthy-looking indicator guarantees a specific runtime under your load.

What mistakes reduce UPS protection or runtime?

The most common mistake is plugging in too much equipment. A UPS can overload or offer much less runtime when the connected devices draw more power than expected.

Another mistake is putting a printer or appliance on battery backup because an outlet is available. Keep laser printers on surge-only outlets when the UPS provides them, and follow the manual for both the UPS and printer.

Don't assume every outlet on a UPS provides battery backup. Confirm the outlet labels, and avoid connecting a surge protector or power strip unless the UPS maker permits it.

Our guide to using a surge protector with a UPS covers outlet expansion and daisy-chaining concerns. For help interpreting an alarm, see what different UPS beeps mean.

How can you get more runtime from a UPS?

To get more runtime, connect only the equipment you need during an outage. A computer, one monitor, and network gear may be enough for work; remove speakers, printers, chargers, or spare displays that don't help you save work or stay online.

The APC BE850G2 is rated at 850VA/450W, and APC states up to 35 minutes at a 100W load. Runtime changes with the connected load and battery condition, so treat that figure as a reference for a light load rather than an estimate for every setup.

A larger VA number alone doesn't tell you how long a particular computer will run. See how long a 1500VA UPS may run a computer for an example of why equipment load matters.

What should you plug into a UPS? Make the decision

For a basic home office, plug the computer, one monitor, modem, and router into battery-backup outlets, then add a NAS if it needs protection from sudden power loss. Keep the printer and high-draw appliances off battery outlets, and use surge-only outlets for equipment that doesn't need to stay on.

Pick the APC BE850G2 for a modest desk with a useful mix of backup and surge-only outlets. Choose the CyberPower ST900U when you need more outlets for a compact office or entertainment setup, and the Tripp Lite OMNI1500LCDT when your load needs its higher capacity, AVR, and LCD status display.

Before buying, total the wattage of the devices you want backed up and compare it with the UPS limit. To understand the basics before comparing models, start with what a UPS system is.

Frequently asked questions

What should be plugged into a UPS?

Plug devices that need brief backup to save work or stay connected, such as a computer, monitor, router, modem, or essential NAS. Use the battery-backup outlets for those devices, and check the UPS's watt limit against their combined load.

Put less critical gear on surge-only outlets if available.

Should you plug a laser printer into a UPS?

Usually, no. Laser printers can draw a high amount of power while heating, which may overload a small UPS or sharply reduce its runtime.

Keep a printer on a wall outlet or a separate surge-protected outlet, following both devices' instructions.

Don't connect it to a battery-backup outlet unless the UPS maker says it's supported.

Can a Wi-Fi router go on a UPS?

Yes. A router and modem are sensible UPS loads if keeping internet access during an outage matters to you.

Plug them into battery-backup outlets and check their power needs alongside the computer and other equipment.

A router-only setup draws less than a full desk, so it may run longer on the same UPS.

Can I plug a surge protector into a UPS?

Check the UPS manual first, because some manufacturers advise against connecting a surge protector or power strip to the UPS. Use the UPS's own outlets when possible, and avoid daisy-chaining strips.

For more, see our guide to plugging a surge protector into a UPS.