Which UPS topology and output power rating best fits your load requirements?

The SMT2200I uses Line Interactive topology with a 2.2 kVA / 2,200W output capacity (max configurable power listed as 2.2 kVA). Its transfer time to battery is 2ms typical, and output voltage distortion is specified at less than 5%. Output frequency is 47–53 Hz. This topology conditions power through a buck-boost AVR but does not fully isolate the load from mains during normal operation.

The SRT2200XLA uses Double Conversion Online topology, meaning the load runs entirely off the inverter at all times — there is no transfer time to battery in the traditional sense, as the inverter is always active. Its kW rating is 1,800W (not 2,200W), and maximum configurable power is also listed as 1,800W / 2,200VA. Output harmonic distortion is less than 2% — tighter than the SMT2200I's less-than-5% figure. Output frequency syncs to mains at 50/60 Hz ±3 Hz. The SRT2200XLA also specifies a crest factor of 3:1 and includes an internal automatic and manual bypass.

For loads that are sensitive to any power transition or that require the tightest output quality, the double conversion topology of the SRT2200XLA provides continuous isolation and lower harmonic distortion. However, buyers should note that its usable watt capacity (1,800W) is lower than the SMT2200I's (2,200W at 230V), which matters when sizing for high-density loads.

How do battery architecture, recharge time, and runtime expandability compare?

Both units specify a typical recharge time of 3 hours and a battery life expectancy of 3–5 years, with one RBC unit included. The SMT2200I uses a Sealed Lead-Acid battery (replacement: RBC55) and does not specify runtime expandability in the provided specs. Its battery interface is through the standard APC RBC cartridge system.

The SRT2200XLA specifies a 72V battery system (replacement: APCRBC141 or SRT72RMBPUS) with a rated battery charge power of 102W and a 306 VAh runtime capacity. Critically, the SRT2200XLA supports external battery expansion via the SRT72BP battery module line, with documented runtime options ranging from 918 VAh (1 pack) up to 6,426 VAh (10 packs) — a capability not present in the SMT2200I's provided specs.

For deployments where extended runtime is a requirement — such as data closets needing 30+ minutes of protection — the SRT2200XLA's modular battery expansion architecture is a significant differentiator. The SMT2200I's specs do not indicate any runtime extension capability.

What are the differences in physical form, management interfaces, and environmental ratings?

The SMT2200I is specified at 435mm H × 197mm W × 544mm D and weighs 48.8 kg (net). It is not described as rack-mountable in the provided specs. It includes a multi-function LCD control panel, one SmartSlot interface for optional management cards, and input connections for IEC-320 C20, Schuko CEE 7, and British BS1363A plugs. Output connections are 1× IEC C19, 8× IEC C13, and 2× IEC Jumpers. Audible noise is rated at 45.0 dBA. Conformance approvals include CE, CSA, EAC, EN/IEC 62040-1, EN/IEC 62040-2, RCM, and VDE.

The SRT2200XLA is specified at 17.01 in (43.2 cm) in one dimension and weighs 55.12 lb (25 kg). It is explicitly noted as not rack-mountable, with a vertical tower mounting position. Input is NEMA 5-20P (North American 120V, 20A plug); outputs are six NEMA 5-20R receptacles and one NEMA L5-20R. A network management card (NMC2 or NMC3) is listed as optional. The unit carries an IP20 rating. Operating altitude is specified up to 10,000 ft (approximately 3,048m); storage altitude up to 50,000 ft. Its heat dissipation is 535 BTU/hr — nearly double the SMT2200I's 275 BTU/hr — which reflects the continuous inverter operation inherent to double conversion topology.

The SMT2200I's SmartSlot interface and multi-function LCD are clearly specified. The SRT2200XLA specifies an optional network management card slot and audible/visible alarms but does not specify an LCD panel in the provided data. Operating humidity for both is 0–95%; the SRT2200XLA explicitly notes non-condensing. Storage elevation is higher for the SRT2200XLA (50,000 ft vs. 15,000 ft for the SMT2200I).

Which should you choose: the SMT2200I or the SRT2200XLA?

Our take: The SMT2200I is the stronger choice when the deployment is in a 230V region, load wattage approaches 2,200W, and heat budget is constrained. It delivers a full 2,200W output capacity versus the SRT2200XLA's 1,800W ceiling — a 400W gap that matters when sizing for dense loads. Its online thermal dissipation is 275 BTU/hr versus 535 BTU/hr for the SRT2200XLA, nearly half the cooling burden. Conversely, the SRT2200XLA is the stronger choice for 120V North American deployments requiring the tightest power quality: its double conversion topology eliminates transfer time entirely, and its output harmonic distortion of less than 2% beats the SMT2200I's less than 5%. For sites needing extended runtime, the SRT2200XLA's documented modular battery expansion (up to 10 external packs, up to 6,426 VAh) has no equivalent in the SMT2200I's provided specs. Choose the SMT2200I for 230V markets with high-wattage loads; choose the SRT2200XLA for 120V deployments where continuous power conditioning and runtime scalability outweigh raw watt capacity.

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 SRT2200XLA product page — full specs and to add to a quote