The Xtreme Power Conversion M90S-4S and the APC Symmetra LX 12 kVA (SYA12K16P) are modular, true online, double-conversion UPS systems designed to protect mission-critical single-phase 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, flexible modularity, and assured long-term expansion and factory support, whereas the Symmetra LX is a discontinued legacy system.
12 kVA Modular Online UPS Comparison (Tower)
| Feature | XTREME POWER M90S-4S | APC Symmetra LX 12 kVA (SYA12K16P) | 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 | Flexible module configuration |
| Efficiency | Up to 98% (ECO) / 93% online | ~88.7% online | Lower operating cost & heat output |
| Internal Runtime | Up to 9 min @ 12 kW | Up to 6 min @ 9.6 kW | Longer internal runtime |
| Maintenance Bypass | Standard | Standard | Equivalent serviceability |
| 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 tower systems
- Applications requiring full usable kW output (unity power factor)
- Facilities prioritizing higher efficiency and reduced cooling load
- Installations needing flexible power vs battery module allocation
- Organizations planning future expansion with assured factory support
When APC Symmetra LX May Still Be in Use
- Existing deployments with installed spare modules
- Short-term environments where no expansion is planned
- Legacy systems awaiting scheduled infrastructure 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 in the same 12 kVA class
- Greater efficiency to reduce operating and cooling costs
- 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 installation
- No requirement for future expansion or factory support
Ideal Applications
- Enterprise and edge data-center environments
- Healthcare and laboratory facilities
- Industrial and manufacturing operations
- Government and education infrastructure
- Symmetra LX replacement and modernization 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 smooth migration from legacy Symmetra LX systems.
Xtreme Power Conversion
Phone: (800) 582-4524
Email: sales@xpcc.com