The Xtreme Power Conversion M90S-4S (with M90S-RMK rack-mount kit) and the APC Symmetra LX SYA12K16RMP are modular, true online, double-conversion UPS systems designed to protect mission-critical single-phase rack-mounted loads.
While both platforms support hot-swappable modules and scalable architectures, the M90S-4S is an active, current-generation platform that delivers higher usable power, greater efficiency, and assured long-term expansion and factory support, whereas the Symmetra LX is a discontinued legacy system.
12 kVA Modular Rack-Mounted UPS Comparison
| Feature | XTREME POWER M90S-4S (with M90S-RMK) | APC Symmetra LX SYA12K16RMP | XPCC Advantage |
| Product Status | Active production | Discontinued | Long-term platform availability |
| Capacity | 12 kVA / 12 kW (unity PF) | 12 kVA / 9.6 kW (0.8 PF) | ~25% more usable power |
| Topology | Online Double Conversion | Online Double Conversion | Equivalent protection |
| Modularity / Scalability | 4-slot modular chassis (power or battery) | Scalable to 16 kVA N+1 (12.8 kW) | Flexible module configuration |
| Rack Height | 33 in (19U) | 32.9 in (19U) | More usable kW per rack |
| Efficiency | Up to 98% (ECO) / 93% online | ~88.7% online | Lower operating cost & heat |
| Internal Runtime | Up to 9 min @ 12 kW | Up to 6 min @ 9.6 kW | Longer internal runtime |
| Maintenance Bypass | Standard | Standard | Equivalent serviceability |
| Module Slot Flexibility | Universal slots (power or battery) | Dedicated power & battery slots | Simpler expansion & sparing |
| Warranty | 3-year repair or replace | 2-year repair or replace | Longer standard warranty |
Printable Comparison PDF
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Where the M90S-4S Excels
- Replacing discontinued Symmetra LX rack systems
- Deployments requiring full usable kW output in a 19U footprint
- Facilities prioritizing higher efficiency and lower cooling load
- Installations needing flexible power vs battery module allocation
- Organizations planning future expansion with assured availability
When APC Symmetra LX May Still Be in Use
- Existing installations with on-hand spare modules
- Short-term deployments where no expansion is planned
- Legacy environments pending scheduled UPS refresh cycles
Who Should Choose Which
Choose Xtreme Power Conversion M90S-4S if you need:
- An active, long-term supported modular UPS platform
- Higher usable power (12 kW vs 9.6 kW) in the same rack height
- Greater efficiency to reduce operating cost
- Simpler expansion and sparing with universal module slots
- Longer standard warranty coverage
Choose APC Symmetra LX if you need:
- Temporary continuation of an existing legacy deployment
- No requirement for future expansion or factory support
Ideal Applications
- Enterprise data-center edge racks
- Healthcare and laboratory facilities
- Industrial and manufacturing operations
- Government and education infrastructure
- Symmetra LX rack-mount replacement projects
Plan with Confidence
Request a Quote
Speak with an Xtreme Power Conversion specialist to size the right M90S-4S modular configuration and plan a migration from legacy Symmetra LX systems.
Xtreme Power Conversion
Phone: (800) 582-4524
Email: sales@xpcc.com