Best UPS for Routers and Modems
Routers and modems use little power, so even compact UPS systems can keep internet equipment online for hours.
The best networking UPS protects every required link: modem or ONT, router, switch and primary mesh node.
Buy for runtime and outlet count, not maximum watts.
Best Match for This Use Case
A compact 600VA UPS is enough for basic internet backup, while Eaton 5S1500LCD or APC BR1500MS2 is better when switches, mesh nodes or a NAS share the system.
Editor's Verdict
A compact 600VA UPS is enough for basic internet backup, while Eaton 5S1500LCD or APC BR1500MS2 is better when switches, mesh nodes or a NAS share the system.
Top Picks
APC Back-UPS 600VA
Compact standby UPS for routers, modems and small network gear.
CyberPower 600VA-Class UPS
Low-cost compact UPS for networking and small electronics.
Eaton 5S1500LCD
1500VA/900W line-interactive UPS rated below 25 dB.
APC BR1500MS2
1500VA/900W sine-wave UPS with AVR and ten outlets.
CyberPower CP1500PFCLCD
1500VA/1000W pure sine-wave UPS with twelve outlets.
Quick Comparison
| Model | Capacity | Best Load | Form | Best For |
|---|---|---|---|---|
| APC 600VA class | 600VA | Router + modem | Compact | Simple backup |
| CyberPower 600VA class | 600VA | Router + modem | Compact | Budget |
| Eaton 5S1500LCD | 1500VA / 900W | Network stack | Slim tower | Quiet long runtime |
| APC BR1500MS2 | 1500VA / 900W | Network + office | Tower | Mixed use |
| CyberPower CP1500PFCLCD | 1500VA / 1000W | Network + PC | Tower | High-capacity mixed use |
1. APC Back-UPS 600VA
Compact standby UPS for routers, modems and small network gear.
A small APC Back-UPS is often enough for a modem, router and fiber ONT because networking loads are relatively low.
The main advantage is long runtime relative to a desktop computer load.
Why It Stands Out
- Compact
- Affordable
- Simple
- Good for low loads
- Widely available
What to Consider
- Limited output
- Basic waveform
- Few advanced features
- Not for desktops
Best for: basic router and modem backup.
2. CyberPower 600VA-Class UPS
Low-cost compact UPS for networking and small electronics.
CyberPower’s compact standby models provide inexpensive runtime for low-power networking equipment.
They are best treated as dedicated network UPS devices rather than general office backups.
Why It Stands Out
- Low cost
- Small footprint
- Good low-load runtime
- Simple replacement
- Multiple outlets
What to Consider
- Basic waveform
- Limited management
- Low watt ceiling
- Model availability varies
Best for: budget router, modem and ONT setups.
3. Eaton 5S1500LCD
1500VA/900W line-interactive UPS rated below 25 dB.
Eaton 5S1500LCD is attractive for offices and bedrooms where fan and transformer noise matter.
Its narrow tower form can also fit beside or under a desk without consuming much floor space.
Why It Stands Out
- Very quiet
- Slim footprint
- USB HID support
- Ten outlets
- AVR
What to Consider
- Waveform documentation must be checked for exact use
- Fewer consumer extras
- Replacement ecosystem smaller
- Not rackmount
Best for: quiet desks, bedrooms and low-noise workspaces.
1. APC BR1500MS2
1500VA/900W sine-wave UPS with AVR and ten outlets.
BR1500MS2 is a strong all-around tower UPS for office desktops, monitors, networking gear and active-PFC power supplies.
Its AVR, USB-A/C charging and replaceable battery make it practical for long-term household use.
Why It Stands Out
- Sine-wave output
- AVR
- Ten outlets
- LCD
- Replaceable battery
What to Consider
- Not online topology
- Runtime falls quickly at high load
- Large tower
- Only some outlets are battery backed
Best for: home offices and mixed electronics.
2. CyberPower CP1500PFCLCD
1500VA/1000W pure sine-wave UPS with twelve outlets.
CP1500PFCLCD offers more real watt capacity than many consumer 1500VA rivals and is designed for active-PFC computer power supplies.
Its PowerPanel software, network protection and twelve outlets make it a strong value for desktops and entertainment systems.
Why It Stands Out
- 1000W output
- Pure sine wave
- Twelve outlets
- PowerPanel software
- Strong value
What to Consider
- Short full-load runtime
- Large footprint
- Not zero-transfer
- Battery replacement required
Best for: gaming PCs, workstations and high-draw offices.
How to Choose
Protect the Entire Signal Chain
Include the modem, ONT, router and required switch.
Measure Low-Power Runtime
Networking loads may run for hours.
Check Fiber Equipment
An unpowered ONT will still break internet access.
Back Up One Mesh Node
Additional nodes may be optional during outages.
Use Surge Protection on Data Lines Carefully
Follow provider and equipment guidance.
Keep Ventilation Clear
Small networking closets can become hot.
Frequently Asked Questions
How long can a UPS run a router?
Often several hours because routers and modems use relatively little power.
Do I need to back up the modem too?
Yes, the whole internet chain must remain powered.
What about a fiber ONT?
It also needs backup power unless it has its own battery.
Is pure sine wave necessary?
Usually not for simple network adapters, but it is helpful in mixed systems.
Can one UPS power a router and NAS?
Yes if total load and shutdown requirements are supported.
Will internet still work during a neighborhood outage?
Only if the service provider’s upstream equipment remains powered.