APC by Schneider Electric SMC1500-2UC 1440VA 2U Rackmount Line-Interactive UPS
The APC SMC1500-2UC is a 1440VA / 900W line-interactive UPS in a 2U rackmount chassis — a practical fit for small server rooms, security head-end racks, and surveillance NVR deployments where conditioned, battery-backed power is non-negotiable. With true sine wave output and an input operating window of 93–136V, the SMC1500-2UC handles the kind of voltage sag and surge that brownout-prone facilities deal with daily, without switching to battery unnecessarily. Explore the full APC by Schneider Electric power protection lineup if you need to compare models across the range.
Key Features
- 1440VA / 900W Capacity: Sized to support a mid-density NVR or server load — enough headroom for a 16- to 32-channel recorder plus a PoE switch without pushing the unit past 80% utilization, the practical ceiling for UPS sizing. Check your connected load wattage before purchasing; if your rack draws over 720W continuously, move up in capacity.
- True Sine Wave Output: Supplies a clean sine waveform under battery power, not a stepped approximation. This matters for active PFC power supplies (common in modern servers and NVRs) — square-wave or simulated-sine UPS units can cause PFC supplies to fault or trip during a transfer. True sine wave eliminates that failure mode entirely.
- Line-Interactive Topology: Voltage regulation corrects sags and surges in-line without engaging the battery. In facilities with marginal utility power, this meaningfully extends battery life compared to online double-conversion designs — the battery is held in reserve for true outages, not cycled on every voltage event.
- Wide Input Voltage Window (93–136V): Accepts utility power down to 93V and up to 136V before switching to battery. In brownout-prone environments or on circuits shared with high-draw equipment (HVAC, compressors), this range reduces unnecessary battery cycling and wear.
- Output Voltage Stability (110–127V): Regulated output stays between 110V and 127V regardless of what's coming off the utility feed. Connected equipment sees consistent power — critical for surveillance recorders where power fluctuations can cause drive errors or unexpected reboots.
- 680J Surge Energy Rating: Provides meaningful transient suppression for equipment connected downstream. 680 joules is adequate for a secondary point-of-use installation where the building has upstream panel-level protection; for direct service entrance applications, pair with a dedicated surge protection device.
- EMI/RFI Noise Filtering: Actively filters electromagnetic and radio-frequency interference off the AC line — relevant in rack environments where switching power supplies, VFDs, or RF-emitting equipment are co-located. Cleaner power reduces unexplained lock-ups in sensitive electronics.
- 6x 120V Outlets: Six NEMA 5-15R (or 5-20R — verify from outlet configuration label) receptacles on the rear panel distribute protected, conditioned power across multiple devices. In a typical surveillance head-end, you'd split outlets between the NVR, the PoE switch, and the management workstation.
- 2U Rackmount Form Factor: Occupies two rack units in a standard 19-inch EIA rack. Compact enough to leave room in a half-rack or small wall-mount enclosure without dominating the build.
- Hold Time 6–10ms: Minimum transfer time from utility to battery is 6ms, maximum 10ms. Most ATX and server power supplies tolerate up to 16ms of sag before a brownout reset — the SMC1500-2UC's transfer window stays within that tolerance, preventing unexpected reboots during switchover.
- Output THD ≤5%: Total harmonic distortion at the output stays at or below 5% under load. Low THD reduces heat build-up in downstream power supplies and motors, extending the service life of connected equipment.
- 45dB Operating Noise: Fan noise rated at 45dB — comparable to a quiet office environment. Suitable for installations in occupied spaces (small IT closets, retail back-of-house rooms) where a loud UPS would be disruptive.
- 50/60Hz Input and Output Compatibility: Accepts both 50Hz and 60Hz utility feeds and maintains the same frequency at output, making the SMC1500-2UC deployable across US (60Hz) and international (50Hz) facilities without configuration changes.
Integration and Compatibility
The SMC1500-2UC (often searched as SMC1500 2UC) integrates into standard 19-inch rack builds without adapters. APC's Smart-UPS C line is broadly compatible with APC's PowerChute network shutdown software for graceful OS-level shutdown during extended outages — relevant for NVR systems running Windows or Linux where a hard power cut can corrupt the recording database. Check that your network management interface (NMC slot or USB, depending on configuration) matches your monitoring infrastructure. For network video recorder deployments, the UPS communicates outage events to the host OS via USB or serial, allowing the NVR software to initiate a clean shutdown before battery exhaustion. Pair with an appropriately rated rack PDU if you need to distribute the UPS output to more than six devices or require metered/switched outlet control. For PoE switch planning in surveillance racks, refer to the PoE planning guide to ensure the UPS load budget accounts for full PoE draw at peak.
Frequently Asked Questions
Q: What is the output waveform of the SMC1500-2UC when running on battery?
A: The SMC1500-2UC delivers a true sine wave output on battery — not a stepped or simulated approximation. This makes it compatible with active PFC power supplies found in most modern servers, NVRs, and workstations.
Q: How wide is the input voltage tolerance before the unit switches to battery?
A: The SMC1500-2UC accepts utility input from 93V to 136V without switching to battery. Below 93V or above 136V, it transfers to battery power automatically.
Q: Is the SMC1500-2UC compatible with APC PowerChute software for graceful shutdown?
A: The Smart-UPS C series is designed to work with APC's PowerChute network shutdown software. Verify the specific interface (USB or network management card) present on your unit matches your monitoring setup.
Q: What is the transfer time from utility to battery power?
A: Transfer time is 6ms minimum to 10ms maximum — within the hold-up tolerance of most ATX and server power supplies, preventing equipment restarts during switchover.
Q: How much rack space does the SMC1500-2UC require?
A: The unit occupies 2U (two rack units) in a standard 19-inch EIA rack.
Q: What is the surge energy rating on the SMC1500-2UC?
A: Surge energy rating is 680 joules, with active EMI/RFI line filtering included. For primary service entrance protection, supplement with a dedicated surge protection device upstream.
The SMC1500-2UC is the rackmount UPS I recommend most often for small-to-mid surveillance head-end builds — specifically because of its true sine wave output under battery and a 93–136V input window that handles the real-world utility quality on the kinds of circuits security integrators are handed in older commercial buildings. At 1440VA / 900W, it sits in the right capacity band for a 16- to 32-channel NVR plus a managed PoE switch without over-sizing the install.
Technical Highlights:
- True Sine Wave on Battery: Active PFC supplies in modern NVRs and switches will fault on a stepped-sine UPS. The SMC1500-2UC's sine output means no surprises at switchover — the connected equipment doesn't know the utility just failed.
- 6–10ms Transfer Window: Stays inside the 16ms hold-up threshold of virtually every ATX supply on the market. In practice, I've never seen a properly powered NVR reboot during a transfer with this unit.
- Output THD ≤5%: Low harmonic distortion reduces heat accumulation in downstream power supply capacitors — meaningful for 24/7 surveillance hardware that runs continuously for years without maintenance windows.
Deployment Considerations:
- Size your connected load to 80% of the 900W rating (720W continuous) — above that threshold, runtime drops sharply and thermal performance degrades in warm equipment rooms. Add up NVR TDP, switch PoE budget, and workstation draw before committing to this capacity.
- The 680J surge rating is adequate as a secondary protection layer but is not a substitute for a whole-building or panel-level SPD. On service entrances without upstream protection, install a dedicated surge device before the UPS input.
For a surveillance integrator building a 19-inch rack in a retail or light commercial environment — NVR, PoE switch, and management workstation — the SMC1500-2UC delivers the clean power and transfer reliability that keeps recording uptime high without requiring a full online double-conversion unit at two to three times the cost.
