APC by Schneider Electric SMT1500J vs APC by Schneider Electric SMX1500RMI2U: Specification Comparison
Both the SMT1500J and SMX1500RMI2U are 1500 VA line-interactive UPS units from APC's Smart-UPS range, sharing the same topology, output waveform, and battery chemistry. The comparison focuses on the three dimensions that matter most to installers and IT buyers evaluating 1500 VA UPS hardware: power capacity and runtime, physical form factor and deployment environment, and management interfaces plus protection features. The SMT1500J targets single-phase 100 V AC Japanese markets; the SMX1500RMI2U targets 230 V AC rack-mount deployments common in Europe and international data-centre environments.
In This Guide
- Which unit delivers more usable watts and how long will each run connected loads?
- How do the two units differ in physical format, mounting, and operating environment tolerances?
- What management interfaces and electrical protection features does each unit provide?
- Which should you choose: the SMT1500J or the SMX1500RMI2U?
- Side-by-Side Specs
- FAQ
Which unit delivers more usable watts and how long will each run connected loads?
The SMT1500J is rated at 980 W / 1500 VA on a 100 V AC input, yielding a 0.65 power factor. Specified runtime is 7 minutes at full load and 24 minutes at half load, with a recharge time of 4 hours.
The SMX1500RMI2U is rated at 1200 W / 1500 VA on a 230 V AC input, yielding a 0.80 power factor. Rated battery charging power is 103 W, and typical recharge time is 3 hours. Runtime figures are referenced to an external graph rather than stated numerically in the provided specs. Battery life is specified as 3–5 years; the replacement battery is APCRBC115.
The SMX1500RMI2U delivers 220 W (22%) more usable output power at the same VA rating, and its recharge time is 1 hour shorter. Runtime data for the SMX1500RMI2U cannot be compared numerically from the provided specifications.
How do the two units differ in physical format, mounting, and operating environment tolerances?
The SMT1500J is a tower unit weighing 61.95 lbs (approximately 28.1 kg). Its single height dimension is listed as 6.8 in; full shipping dimensions are 12.9 × 23.4 × 14.8 in. No rack-mount capability is stated in the provided specs.
The SMX1500RMI2U is a 2U rack-mount unit. Its height is specified as 89 mm. It ships with rack mounting support rails and removable support feet, and its mounting mode is explicitly rack-mounted. Weight is 24.82 kg (approximately 54.7 lbs). Operating altitude is specified up to 10,000 ft; storage altitude up to 15,240 m.
The SMT1500J is heavier and designed for floor or desktop tower deployment. The SMX1500RMI2U occupies 2U of rack space and includes all hardware needed for rack installation. Operating temperature range is fully specified only for the SMT1500J (32–104 °F / 0–40 °C). Acoustic output favours the SMX1500RMI2U at 40 dBA versus 45 dBA for the SMT1500J.
What management interfaces and electrical protection features does each unit provide?
The SMT1500J provides one RS-232 management port, one USB Type-B port, and one SmartSlot expansion slot (1 free). Surge energy rating is 459 J. Input voltage range is AC 80–123 V with an adjustable range of AC 70–125 V. Output connectors are 8 × NEMA 5-15 receptacles. Circuit protection is via circuit breaker. Compliant standards include UL 1449, UL 1778, VCCI Class A ITE, RoHS Exemption 7b, and REACH.
The SMX1500RMI2U provides a serial port, a USB port, and one available expansion slot. Surge energy rating is 645 J. Input connection is IEC 320 C14; output connectors are 8 × IEC 320 C13 plus 2 IEC jumper outlets. Noise filtering is described as full-time multi-pole with 5% IEEE surge let-through and zero clamping response time. Harmonic distortion is less than 5%. Certifications include CE, CSA, EAC, RCM, and UK PSTI. Standards include EN/IEC 62040-1:2019/A11:2021 and EN/IEC 62040-2.
The SMX1500RMI2U has a 186 J higher surge energy rating (645 J vs 459 J) and adds explicit noise filtering specifications absent from the SMT1500J's provided specs. Both units share a single expansion slot and comparable serial/USB connectivity. Outlet types and input connectors are entirely different, reflecting their distinct regional voltage standards.
Which should you choose: the SMT1500J or the SMX1500RMI2U?
Our take: The SMX1500RMI2U is the stronger choice when the installation environment uses 230 V AC mains, requires rack mounting, and demands maximum output wattage from a 1500 VA unit. It delivers 1200 W versus the SMT1500J's 980 W—a 22% watt advantage at the same VA rating—recharges in 3 hours versus 4 hours, and provides a higher surge energy rating of 645 J versus 459 J. Its 2U rack-mount form factor with included rails suits server rooms and network cabinets directly. The SMT1500J is the correct choice solely for 100 V AC Japanese-market deployments where NEMA 5-15 outlets, UL 1449/1778 and VCCI Class A compliance, and a tower form factor are required. Buyers should note that runtime figures for the SMX1500RMI2U are not stated numerically in the provided specifications and must be obtained from APC's published runtime graph before finalising load planning.
Side-by-Side Comparison
Spec-for-spec, from manufacturer data.
| Specification | APC by Schneider Electric SMT1500J | APC by Schneider Electric SMX1500RMI2U |
|---|---|---|
| UPS Topology | Line interactive | Line interactive |
| VA Rating | 1500 VA | 1500 VA |
| Watt Rating | 980 W | 1200 W |
| Power Factor | 0.65 | 0.80 |
| Input Voltage | AC 100 V | 230 V AC 1-phase |
| Input Voltage Range | AC 80–123 V (adj. 70–125 V) | 151–302 V adjustable / 160–286 V |
| Input Connector | NEMA 5-15 | IEC 320 C14 |
| Output Connectors | 8 × NEMA 5-15 | 8 × IEC 320 C13 + 2 IEC jumpers |
| Output Waveform | Sinewave | Sine wave |
| Surge Energy Rating | 459 J | 645 J |
| Battery Type | Lead acid | Lead-acid |
| Recharge Time | 4 hours | 3 hours |
| Runtime at Full Load | 7 min | Not stated numerically in specs |
| Runtime at Half Load | 24 min | Not stated numerically in specs |
| Form Factor | Tower | 2U rack-mount |
| Acoustic Output | 45 dBA | 40 dBA |
| Weight | 61.95 lbs (approx. 28.1 kg) | 24.82 kg (approx. 54.7 lbs) |
| Management Interfaces | RS-232, USB Type-B | Serial port, USB port |
| Expansion Slot | 1 × SmartSlot (free) | 1 × available expansion slot |
| Warranty | Limited – 2 years | — (not stated in provided specs) |
| Compliance / Certifications | UL 1449, UL 1778, VCCI Class A, RoHS Exemption 7b, REACH | CE, CSA, EAC, RCM, UK PSTI; EN/IEC 62040-1:2019, EN/IEC 62040-2 |
Frequently Asked Questions
Which should you choose: the SMT1500J or the SMX1500RMI2U?
The SMX1500RMI2U is the stronger choice when the installation environment uses 230 V AC mains, requires rack mounting, and demands maximum output wattage from a 1500 VA unit. It delivers 1200 W versus the SMT1500J's 980 W—a 22% watt advantage at the same VA rating—recharges in 3 hours versus 4 hours, and provides a higher surge energy rating of 645 J versus 459 J. Its 2U rack-mount form factor with included rails suits server rooms and network cabinets directly. The SMT1500J is the correct choice solely for 100 V AC Japanese-market deployments where NEMA 5-15 outlets, UL 1449/1778 and VCCI Class A compliance, and a tower form factor are required. Buyers should note that runtime figures for the SMX1500RMI2U are not stated numerically in the provided specifications and must be obtained from APC's published runtime graph before finalising load planning.
Can I use the SMX1500RMI2U in a North American 120 V AC environment?
No. Based on the provided specifications, the SMX1500RMI2U requires a 230 V AC single-phase input via an IEC 320 C14 inlet. It is not specified for 100 V or 120 V AC mains. The SMT1500J is specified for 100 V AC input with a NEMA 5-15 input connector, making it the unit designed for Japanese 100 V installations. Neither unit is specified for standard North American 120 V AC in the provided data.
Does either unit support extended runtime with external battery packs?
The SMX1500RMI2U's additional specification field lists 'EXTENDED RUN,' which indicates compatibility with external battery extension, and its replacement battery is identified as APCRBC115. The SMT1500J's provided specifications do not reference extended-run capability or an external battery pack option. Buyers requiring extended runtime should verify SMT1500J compatibility directly with APC, as that information is absent from the specs provided.
Which unit is quieter in a shared office or noise-sensitive environment?
The SMX1500RMI2U is specified at 40 dBA acoustic output; the SMT1500J is specified at 45 dBA. The 5 dBA difference represents a meaningful reduction in perceived noise level. However, the SMX1500RMI2U is a rack-mount unit typically installed in a dedicated equipment room, while the SMT1500J is a tower unit more likely to be deployed in an office setting. Installation context should factor alongside the acoustic rating when making this determination.
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