A power station with a UPS mode looks like a better deal than a UPS: hours of runtime instead of minutes, and a LiFePO4 battery that outlasts lead-acid by years. The catch is in two numbers most listings bury, how fast it switches to battery and whether your server can hear it when the power goes.
For a router or a switch, almost any power station with a UPS mode works; for a mini PC, pick one that switches in 10 ms or less. For a NAS or a Proxmox or TrueNAS host that has to shut itself down, a line-interactive pure sine UPS is still the safe default. The EcoFlow River 3 Plus is the one in-stock power station that can stand in, with caveats. We compared the switchover specs, the independent measurements and the NUT support of the main UPS and power station options for this power station vs UPS guide, using vendor manuals and published tests.
Current as of October 2026.
Power station vs UPS: the short answer
Start from what the box has to protect, not from the battery size, because the load decides which spec matters:
- Router, ONT, switch, access point: any power station with a UPS mode, including 20 ms units. Long runtime is the win here, and these devices do not need a shutdown signal.
- One mini PC or a small mini rack: a sub-10 ms power station works, but you will shut the hosts down by hand or not at all. Our mini PC picks for Proxmox list typical idle draw.
- A NAS or a hypervisor with a ZFS pool: a line-interactive pure sine UPS with USB HID, which NUT’s usbhid-ups driver has supported for years.
- A NAS and you want lithium: the EcoFlow River 3 Plus, if you can run a recent NUT release and set an on-battery shutdown timer.
You can also run both: a UPS in front of the NAS so it shuts down cleanly, and a power station keeping the network gear up for hours. If you only need the UPS side, our UPS guide for homelab and NAS setups covers the picks and the full NUT setup.
Switchover time against PSU hold-up
Power stations switch to battery the way a standby UPS does (EcoFlow’s manuals use exactly that term), so the load drops for a few milliseconds while the inverter takes over. Whether your machine notices depends on its power supply’s hold-up time, the window it can keep running on stored energy:
- ATX 3.0 power supplies: at least 17 ms at full load, per Intel’s design guide.
- ATX 3.1 power supplies: about 12 ms at full load, with 17 ms recommended at 80% load, per Seasonic.
- A single server PSU: HPE’s M-CRPS spec gives 10 ms at 100% load and 20 ms at 50%.
Real units usually beat the minimum. Hwbusters measured 14.3 ms and 15.6 ms on two recent Cooler Master supplies, near the bottom of its charts, against a 20.2 ms median at full load, with the best units near 30 ms. That’s why a 20 ms power station works with most desktops at typical loads and still drops some, so the switchover spec is the first thing to check. StorageReview has measured several units against a reference UPS in its power station roundup and its single-unit reviews, and the results show how far real numbers drift from the label:
| Unit | Rated switchover | Measured (StorageReview) |
|---|---|---|
| Eaton 5PX G2 (line-interactive UPS) | under 10 ms | 8.6 ms |
| EcoFlow River 3 Plus | within 10 ms | 9 ms |
| Jackery Explorer 2000 Plus | not listed, per the test | 8.7 ms |
| Bluetti AC60 | under 20 ms (Bluetti, per the test) | about 13.8 ms |
| Anker SOLIX F2000 | 20 ms | about 27.4 ms |
| EcoFlow Delta 2 | under 30 ms (EcoFlow, per the test) | about 38.5 ms |
Remember the F2000 result: it came in about 7 ms over its own 20 ms rating, at 27.4 ms, which is longer than the 20.2 ms median hold-up hwbusters measures at full load. The Delta 2 drifted even further past its rating. A lightly loaded PSU holds up longer, which is why so many homelabs get away with a slow unit, but you cannot rely on luck with a storage server. If a power station is rated above 10 ms, test it before you trust it: pull its wall plug while the host runs its typical load, with backups current and nothing you can’t afford to lose writing to the pool, because a failed test drops the host.
Shutdown signalling and NUT support
A UPS protects a NAS twice: it bridges the outage, then tells the host to shut down before the battery runs out. That second job needs a data port and a driver, and Network UPS Tools (NUT) is what TrueNAS uses and what you would install on Proxmox. The NUT hardware list gives a clear split:
| Device | Data port | NUT support |
|---|---|---|
| CyberPower CP1500PFCLCD | USB HID | usbhid-ups, supported for years |
| EcoFlow River 3 Plus | USB-B, cable in the box | usbhid-ups from NUT 2.8.3 |
| EcoFlow Delta 3 Plus | USB-C | usbhid-ups from NUT 2.8.3 |
| Anker SOLIX, Bluetti, Jackery | none for data | no entries |
EcoFlow support comes with four caveats you need to plan around. Stock Debian 13 and Proxmox VE 9 ship NUT 2.8.1, and TrueNAS 25.10 users report 2.8.0, so neither drives an EcoFlow without a newer NUT; a Proxmox user hit exactly that in NUT issue 3306. The River 3 Plus has been reported not to raise low battery in NUT (issue 3068), so a shutdown that waits for it may never fire; setting ignorelb with override.battery.charge.low in ups.conf makes NUT work it out from the charge level, but test it. And some River 3 Plus firmware needs a descriptor fix that is only in NUT’s development branch, planned for the next release. Finally, NUT 2.8.5 has a USB HID crash, seen on a Delta 3 Plus, that is fixed only in that branch.
For the low-battery gap, the practical fix is to shut down on a timer once the unit goes on battery. TrueNAS has that built in as the “UPS goes on battery” shutdown mode, but it cannot take a newer NUT. Run NUT 2.8.3 or newer on another machine with the River plugged into it, then point the TrueNAS UPS service at it in Slave mode; our TrueNAS ZFS build is the kind of host this protects. On Proxmox you’d do the timer with upssched. The Anker, Bluetti and Jackery units here have no data port; their telemetry is a cloud app or Bluetooth, so any automatic shutdown is a DIY project.
Runtime and battery life
Runtime is where power stations win clearly. A 1500 VA lead-acid UPS like the CP1500PFCLCD is rated for 2.5 minutes at full load and 10 minutes at half load, enough to shut down cleanly and not much more. A 1 kWh power station runs a small homelab for hours:
| Unit (nameplate) | 53 W mini rack | 55 W NAS | 120 W load |
|---|---|---|---|
| EcoFlow River 3 Plus (286 Wh) | about 3.9 h | about 3.8 h | about 1.7 h |
| Anker SOLIX C1000 Gen 2 (1024 Wh) | about 14 h | about 13.6 h | about 6.2 h |
| Bluetti AC180 (1152 Wh) | about 15.9 h | about 15.3 h | about 7 h |
These are our estimates, not measurements. We used about 73% of nameplate as usable energy, which is what EcoFlow’s own claim of 600 W for at least 21 minutes on the River 3 Plus works out to, and applied the same ratio to every unit. At light loads the inverter’s own draw shortens runtime, so treat the low-load figures as upper bounds. The 53 W load is the idle figure and 120 W is close to the 122 W peak from the bench table in our mini rack power guide. The 55 W NAS is the ZimaCube 2 idle figure in our ZimaCube 2 build guide.
Battery life follows the same pattern. APC and Eaton both put lead-acid UPS batteries at three to five years, while the LiFePO4 power stations here are rated for 3,000 to 4,000 cycles (most to 80% capacity; Jackery rates the 1000 v2 to 70%). Two costs come with that. A power station also draws power while its inverter is on. That’s about 15 W for the Bluetti AC180 per its manual and about 17 W measured on an EcoFlow Delta 3 Classic, or 131 to 149 kWh a year; a metered PDU like the ones in our rack PDU guide shows you the real figure. Holding a lithium battery at 100% all the time ages lithium cells faster, though LiFePO4 handles it better than other chemistries, so if the app offers a charge limit, around 80% trades a little runtime for a longer life.
1. EcoFlow River 3 Plus
The River 3 Plus is the only power station we’d put in front of a NAS today. It’s in NUT’s hardware list, it’s in stock, and it’s been measured under 10 ms. StorageReview clocked its switchover at 9 ms against EcoFlow’s “within 10 ms” rating.
Inside, you get 286 Wh of LiFePO4 rated for 3,000 cycles to 80%, a 600 W pure sine inverter, and a USB-B port with the UPS communication cable in the box. EcoFlow says it runs a 600 W computer for at least 21 minutes, and at a 55 W NAS idle that stretches to hours. StorageReview’s review has the 9 ms measurement.
Where it falls short:
- NUT version: needs NUT 2.8.3 or newer, which stock Proxmox VE 9 and TrueNAS do not ship.
- No low-battery signal: set an on-battery shutdown timer instead.
- 600 W ceiling: too small for a loaded server or a rack.
Pick it if you want lithium in front of one NAS or mini PC and you’re happy to run a newer NUT. It sells for about $299 from EcoFlow’s Amazon store; check the current price.
2. CyberPower CP1500PFCLCD
For a NAS or a hypervisor, this is still the box we’d buy, because it does the shutdown job on any NUT release you’ll find. It’s a line-interactive UPS with a typical transfer time of 4 ms, sine output on battery and a USB HID port.
CyberPower rates it at 1500 VA and 1000 W, with active PFC compatibility and a three-year warranty that covers the batteries. NUT has supported it through usbhid-ups for years, so TrueNAS works with it out of the box and Proxmox only needs the stock nut packages from the Debian repos. Our UPS guide has the full review and the NUT configuration.
Where it falls short:
- Runtime: 10 minutes at half load, enough to shut down and not to ride out a long outage.
- Battery: sealed lead-acid, a consumable you’ll replace every few years.
- Heat: APC says every 8 °C rise in temperature halves a lead-acid battery’s life, so keep it out of a hot closet.
Buy it if clean, automatic shutdown matters more to you than runtime. It sells for about $240 from Amazon; check the current price.
3. Anker SOLIX C1000 Gen 2
The C1000 Gen 2 is the big-battery pick for network gear and a mini PC, with a rated UPS switchover of under 10 ms on all AC outlets. That rating is Anker’s; we found no independent measurement for this model.
You get 1024 Wh of LiFePO4 rated for 4,000 cycles to 80% and 2000 W of output, so a 53 W mini rack runs for about 14 hours on our estimate. Don’t confuse it with the original C1000, which Anker’s own user guide rates at 20 ms for UPS, a different class of risk for a PC. There’s no data port, and the Home Assistant options are either cloud-based or local Bluetooth projects you’d wire up yourself.
Choose it if you want hours of runtime for a router, switch and mini PC and you’ll handle shutdowns by hand. Skip it if a NAS has to shut itself down. It sells for about $570 from AnkerDirect; check the current price.
4. Bluetti Elite 30 V2
The Elite 30 V2 is the cheapest sub-10 ms power station on this list, at its current sale price of about $280 for 288 Wh of LiFePO4 and 600 W of output. It’s a good match for an ONT, a router and a small switch.
Bluetti rates the switchover at 10 ms or less and the battery at over 3,000 cycles. It’s also honest about the limits: its user manual says it’s not for data servers or workstations that need a high-performance UPS. Bluetti lists no-load draw as 4.5 W with only AC on and 9 W with AC and DC on, so plan for 9 W.
Get it if you want a small, cheap battery for your network gear. Skip it if it would sit in front of a NAS or a server, as Bluetti itself says. It sells for about $280 from Bluetti’s Amazon store; check the current price.
The 20 ms power stations to keep away from a NAS
These three are popular, well-made units, and all of them are rated at about 20 ms for UPS switching. That’s fine for network gear, but it is above what an ATX 3.1 supply has to hold, so we would not put any of them in front of storage:
| Unit | Rated switchover | What the maker says | Price |
|---|---|---|---|
| Anker SOLIX C1000 (original) | 20 ms | UPS listed at 20 ms in Anker’s user guide | about $500 |
| Bluetti AC180 | 20 ms or less | turn off Grid Enhancement for UPS use; test before relying on it | about $449 |
| Jackery Explorer 1000 v2 | within 20 ms | its manual warns against data servers and workstations | about $499 |
If you already own one, it’s still a good battery for the router and the access points, and the UPS keeps the NAS. EcoFlow’s Delta 3 Plus would be the larger NUT-capable option, measured at just over 8 ms. It was out of stock as a standalone unit on Amazon US when we checked.
Where each option falls short
No single box does everything, so your choice is about which weakness you can live with:
- Line-interactive UPS: minutes of runtime and a lead-acid battery you’ll replace, but the CP1500PFCLCD’s rated 4 ms transfer is quicker than any power station rating here, and shutdown support works everywhere.
- EcoFlow River 3 Plus: lithium and NUT support, but only with a newer NUT, a timer instead of a low-battery signal, and a 600 W ceiling.
- Sub-10 ms power stations without a data port: hours of runtime, but no automatic shutdown and 5 to 20 W of idle draw around the clock.
- 20 ms power stations: big batteries, but a switchover that some PSUs won’t ride through.
If you want a lithium battery and real UPS behaviour in one box, line-interactive lithium UPS units exist, but they cost several times the CP1500PFCLCD, and our UPS guide mentions them. For most homelabs, a lead-acid UPS for the NAS plus a power station for the network is the setup we’d build.
