Which UPS topology and runtime architecture best protects your critical load?

The SMT2200I uses Line Interactive topology with a 2ms typical transfer time to battery, meaning brief power anomalies trigger a switchover that, while fast, is not zero-transfer. Its rated output is 2200VA with no separate watt figure specified in the provided specs. The SRT2200RMXLA uses Double Conversion Online topology, where the load runs continuously from the inverter — transfer time to battery is effectively zero because the inverter never disconnects. Its rated output is 2200VA / 1800W (0.82 power factor), explicitly stated.

On runtime extensibility, the SRT2200RMXLA supports up to 8 external SRT72RMBP battery modules, scaling from 916 VAh to 6,426 VAh of additional capacity. The SMT2200I spec lists no external battery extension option — only a single internal RBC55 pack. For applications requiring extended runtime (network closets during prolonged outages, edge sites without generator backup), the SRT2200RMXLA's extensible architecture is a material advantage. For loads where a sub-3ms transfer is tolerable and runtime needs are met by internal batteries alone, the SMT2200I's Line Interactive design imposes lower idle heat and energy loss.

How do input voltage, efficiency losses, and physical environment requirements compare?

The SMT2200I is designed exclusively for 230V input (range 160–286V, adjustable 151–302V) with IEC-320 C20, Schuko, and British BS1363A input connectors — it is not usable on 120V North American circuits without a transformer. The SRT2200RMXLA accepts 120V input via NEMA 5-20P and delivers 120V output across six NEMA 5-20R and one NEMA L5-20R receptacles. These two units are therefore non-interchangeable from a voltage standpoint.

Thermal output reflects the topology difference: the SMT2200I dissipates 275 BTU/hr at full load, while the SRT2200RMXLA dissipates 535 BTU/hr — nearly double — consistent with Double Conversion's continuous AC-DC-AC conversion losses. Audible noise follows the same pattern: 45 dBA (SMT2200I) vs. 55 dBA (SRT2200RMXLA), a 10 dB difference that is perceptible in quiet environments. Operating altitude for the SMT2200I is specified to 3,000 meters; the SRT2200RMXLA to 10,000 ft (approximately 3,048 meters) — essentially equivalent. Both tolerate 0–95% relative humidity (non-condensing noted for SRT2200RMXLA; not explicitly stated for SMT2200I).

What connectivity, output receptacles, and remote management options does each unit provide?

The SMT2200I provides one IEC C19 (high-current) outlet, eight IEC C13 outlets, and two IEC jumper positions — a total of eleven load connection points suited for IEC-standard rack PDUs and server PSUs common in 230V environments. Its single SmartSlot expansion bay accepts optional network management or relay cards. No IP degree of protection rating is listed in the provided specs.

The SRT2200RMXLA provides seven NEMA outlets (six 5-20R plus one L5-20R) and includes one free expansion slot for an optional network management card (NMC 2 or 3 with environmental monitoring, per spec). It carries an IP20 ingress protection rating. The SRT2200RMXLA also explicitly lists an audible and visible alarm system prioritized by severity; the SMT2200I spec notes only a multi-function LCD control panel without specifying alarm output types. Both units support 2U rackmount form factor. Harmonic distortion is specified only for the SRT2200RMXLA (less than 2%); the SMT2200I provides output voltage distortion less than 5% — these are different measurements and not directly comparable.

Which should you choose: the SMT2200I or the SRT2200RMXLA?

Our take: The SRT2200RMXLA is the stronger choice when zero-transfer-time protection and runtime scalability are required in a 120V North American rack environment. Its Double Conversion Online topology eliminates the 2ms transfer window present in the SMT2200I, and its support for up to eight external battery modules versus the SMT2200I's single internal pack makes it the clear winner for extended-runtime deployments. However, this comes at a cost: heat dissipation is 535 BTU/hr versus 275 BTU/hr, and audible noise is 55 dBA versus 45 dBA — meaningful in space- or cooling-constrained installs. The SMT2200I is the correct choice for 230V EMEA or international deployments where Line Interactive topology is acceptable, cooling headroom is limited, and no runtime extension is needed. The two units are voltage-incompatible and not true substitutes within the same region.

Side-by-Side Comparison

Spec-for-spec, from manufacturer data.

Frequently Asked Questions

Related Resources

• APC by Schneider Electric SMT2200I product page — full specs and to add to a quote
• APC by Schneider Electric SRT2200RMXLA product page — full specs and to add to a quote