What Equipment Should a Small Business Put on a UPS?

A small business generally should connect equipment to a UPS when losing power to that device immediately would interrupt an important business process, network service or safe shutdown. The goal is not to place every electronic device on battery backup. It is to protect the equipment that actually benefits from uninterrupted power.

The short answer

For many small businesses, the best UPS candidates are core network equipment, critical servers or storage systems, and selected computers that must remain available long enough to ride through a short interruption or shut down safely.

Equipment that does not need uninterrupted power should generally not consume limited UPS capacity merely because a battery-backed outlet is available.

Start with the business function, not the device

Before deciding what to connect, ask what must continue operating when utility power disappears.

A device is a stronger candidate for UPS protection when an unexpected shutdown could interrupt connectivity, stop a critical application, risk unsaved work, interfere with an orderly system shutdown or disrupt an important business process.

This means two businesses with similar equipment may make different UPS decisions. A desktop computer used occasionally may not require battery backup, while a workstation controlling an essential operational process may.

Equipment commonly considered for UPS protection

Protect the complete network path

Putting only the Wi-Fi access point or router on a UPS does not necessarily preserve Internet access.

The complete local path may include an ISP-provided ONT or modem, firewall/router, network switch and wireless access equipment. If one required component loses power, users may still lose connectivity even though another component remains online.

For businesses using Power over Ethernet, the network switch deserves particular attention. A PoE switch may supply power to access points, phones, cameras or other network devices, which means those downstream devices also contribute to the switch's UPS load.

For related network planning, see How to Choose a Business Router for a Small Business and Managed vs. Unmanaged Switch for Small Business.

Should a server or NAS be on a UPS?

Servers and network-attached storage are common candidates for UPS protection because abrupt power loss can immediately interrupt services and prevent a normal shutdown process.

The UPS does not necessarily need to keep the server operating through an extended outage. In some environments, its primary role is to bridge a brief interruption or provide enough battery time for shutdown software or an administrator to stop systems cleanly.

Server and storage loads can also consume substantially more power than basic networking equipment, so their inclusion can materially reduce available runtime.

Should desktop computers be connected to a UPS?

Not every desktop computer automatically needs battery backup.

A workstation becomes a stronger UPS candidate when an abrupt shutdown would interrupt important work, create operational problems or prevent the user from saving data and shutting down normally.

If the goal is simply to provide enough time for an orderly shutdown, the required runtime may be relatively short. If the workstation must remain productive during an outage, the business must plan for a larger protected load and potentially substantially greater battery capacity.

Monitors also consume power. A desktop may technically remain running while becoming difficult to use if its required display is connected only to a surge-only outlet.

What about VoIP phones and communications equipment?

A VoIP phone may receive power directly from an AC adapter or through a PoE network switch. In either case, protecting only the phone is not enough if the switch, router or other required network equipment loses power.

Businesses that consider voice communications critical should identify the entire local dependency chain and determine which components require battery support.

What equipment should generally stay off a conventional office UPS?

A UPS should not be treated as a general-purpose battery outlet for every device in the office.

Specialized, medical, industrial, life-safety or other unusual equipment should be evaluated according to its specific electrical, regulatory and manufacturer requirements rather than being treated as an ordinary office UPS load.

Battery-backed outlets vs. surge-only outlets

Some UPS models provide both battery-backed outlets and outlets that provide surge protection without battery support.

That distinction matters. A device connected to a surge-only outlet may receive protection from certain electrical disturbances but will still turn off when utility power disappears.

Use the battery-backed outlets for equipment that genuinely requires continuity. Lower-priority peripherals may be better suited to surge-only protection when the UPS manufacturer permits it.

Example: protecting a small-business network

Consider a business whose primary goal is to keep its local network available through short power interruptions.

The example illustrates why selecting the protected equipment comes before UPS sizing. Once the business has identified the devices that truly require uninterrupted power, it can calculate their combined load and determine the appropriate UPS capacity and runtime.

Actual device consumption varies. Use measured or manufacturer-provided power information for the equipment being protected rather than treating these example values as universal specifications.

Do not confuse critical equipment with every useful device

During normal operation, many devices are useful. During an outage, however, every additional battery-backed load reduces the energy available to the highest-priority equipment.

The business should therefore rank equipment according to continuity importance instead of attempting to reproduce normal office operation from a conventional UPS.

For example, keeping the firewall, switch and communications path operating may provide more business value than using the same battery capacity to support several noncritical monitors or peripherals.

Choose the equipment before sizing the UPS

UPS selection should follow the protected-equipment decision, not precede it.

After identifying the devices that require uninterrupted power, determine their expected operating wattage and confirm that the candidate UPS supports the combined watt and VA requirements with practical headroom.

For that process, see What Size UPS Does a Small Business Need?

Then determine the required runtime

Electrical capacity determines whether the UPS can support the protected equipment. Battery runtime determines how long it can continue supporting that equipment after utility power fails.

Reducing unnecessary protected loads can therefore increase the useful runtime available to the equipment that matters most.

For runtime planning, see How Long Will a UPS Run During a Power Outage?

When a UPS is not enough

If the business needs selected equipment to operate through a substantially longer outage, a conventional UPS may be only one layer of the continuity strategy.

Longer-duration requirements may justify evaluating larger battery systems, battery power stations, generators or a layered approach.

For the broader decision, see Backup Power for Small Business: UPS, Battery Power Station or Generator?

You can also compare the two battery approaches in UPS vs. Battery Power Station for Small Business: Which Is Better?

UPS equipment checklist

• Identify the business processes that cannot tolerate an immediate power loss.
• List the equipment required for those processes.
• Map dependencies such as modem, router, switch and wireless access equipment.
• Include PoE-powered devices when calculating the network load.
• Decide which servers, storage systems or workstations require continuity.
• Remove noncritical equipment from the battery-backed load.
• Check manufacturer guidance before connecting high-draw or unusual equipment.
• Determine the expected wattage of the protected devices.
• Size the UPS for the resulting watt and VA requirements.
• Verify runtime at the actual expected load.
• Plan for graceful shutdown where appropriate.

Bottom line

A small business should put equipment on a UPS when keeping that equipment powered through a short interruption or controlled shutdown provides meaningful operational value.

For many businesses, that means prioritizing the network path, critical servers or storage and selected workstations rather than attempting to battery-back every electronic device in the office.

Start by identifying the business functions that need continuity, map the equipment those functions depend on, and remove unnecessary loads. Then use the resulting protected load to choose the UPS capacity and runtime the business actually needs.

For the next step, see What Size UPS Does a Small Business Need?