Four 30 kVA modules left 15 kVA of surviving margin at a 75 kVA load
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SVX capacity is assembled from 30 kVA power modules, so installed capacity and module-out capacity can be calculated separately. Equipment record: Eaton Tripp Lite Series SVX120KL, companion identifier SVX30PM. Decision: Install four 30 kVA SVX modules for a 75 kVA load so one module can be unavailable while the remaining 90 kVA retains 15 kVA of margin.
Four modules installed, three required
Growth planning often quotes the frame maximum, but the protected load sees only the modules installed and available. N+1 requires one module more than the load needs, while common bypass, controls and distribution remain shared.
For Eaton Tripp Lite Series SVX120KL, the applicability boundary is anchored to 30 kVA/module, 400 V class and part SVX30PM. The 5 worked inputs remain assumptions until they are recorded at the equipment.
Use Tripp Lite service in Canada to arrange service for Eaton Tripp Lite Series SVX120KL; confirm the complete equipment label before booking.
Figure 1. Eaton Tripp Lite Series SVX120KL equipment and power path
SVX module and load quantities
The controlling numerical record is: SVX module rating: 30 kVA/module; Worked installed count: 4 modules; Worked installed capacity: 120 kVA; Worked protected load: 75 kVA; Three-module surviving capacity: 90 kVA; Worked distribution class: 400 V class. Each value has a defined source or assumption status in the engineering ledger. Values from different configurations are not combined as though they came from one installed system.
| Engineering parameter | Value | Evidence status |
|---|---|---|
| SVX module rating | 30 kVA/module | Published OEM value |
| Worked installed count | 4 modules | Worked design assumption |
| Worked installed capacity | 120 kVA | Worked design assumption |
| Worked protected load | 75 kVA | Worked design assumption |
| Three-module surviving capacity | 90 kVA | Worked design assumption |
| Worked distribution class | 400 V class | Worked design assumption |
Four modules provide 120 kVA installed. Removing one leaves three modules and 90 kVA. The 75 kVA load then retains 15 kVA, or 16.7 percent, of surviving-capacity margin. Load growth above 90 kVA would defeat one-module-out continuity.
Fifteen kVA after one module is lost
The worked check uses surviving margin = (4 – 1) x 30 kVA – 75 kVA. With four modules, one unavailable module and a 75 kVA load, the result is 15 kVA surviving margin. The expansion trigger is set below 90 kVA if N+1 is mandatory. The arithmetic is reproducible, but it remains a design check until the listed inputs are confirmed at the equipment.
The 15 kVA surviving margin result follows from surviving margin = (4 – 1) x 30 kVA – 75 kVA. If the 4 modules input changes, this check is repeated rather than carrying the earlier result into a different operating state.
Figure 2. Quantified basis for the Eaton Tripp Lite Series SVX120KL decision
Growth before redundancy disappears
The monitoring record trends total load, per-module load and phase balance. Module availability, not only installed count, controls the live redundancy state.
A module-out test observes load sharing, remaining-module current, output and alarms. The common bypass and downstream distribution are recorded as single points outside the module calculation.
| Path | Technical consequence | Disposition |
|---|---|---|
| Apply the stated engineering decision | Install four 30 kVA SVX modules for a 75 kVA load so one module can be unavailable while the remaining 90 kVA retains 15 kVA of margin. | Selected basis |
| Generic model substitution | Select by family name or rating alone, without confirming the exact configuration. | Not selected on the stated evidence |
| Unverified operating assumption | Treat a design assumption as though it were a site measurement. | Reconsider only if the input changes |
Tripp Lite UPS service across Canada covers field measurements and service work for Eaton Tripp Lite Series SVX120KL.
Confirm availability and catalogue details for Eaton Tripp Lite Series SVX120KL or SVX30PM on the SVX120KL product record page.
The Eaton Tripp Lite Series SVX120KL decision retains part SVX30PM, the 15 kVA surviving margin calculation result and the manufacturer-published 30 kVA/module point in one equipment record. Applicable OEM instructions, qualified electrical authority and the installed single-line or wiring record remain controlling for any executable work.
Module-out and load-sharing test
Acceptance of Eaton Tripp Lite Series SVX120KL depends on five recorded checks:
- Confirm the SVX120KL frame and four installed SVX30PM modules.
- Measure total kVA, kW and phase balance.
- Repeat the 15 kVA module-out margin calculation.
- Prove load sharing and one-module-out operation under the OEM method.
- Set the next growth trigger below 90 kVA and record shared paths.
The Eaton Tripp Lite Series SVX120KL record is not accepted if part SVX30PM does not match, the calculation does not reproduce 15 kVA surviving margin, or the final operating state is not recorded. The equipment returns to the approved safe state when a check stops, and the unresolved condition remains open without an invented repair result.
Figure 3. Verification sequence for Eaton Tripp Lite Series SVX120KL
The next module is triggered by surviving capacity
Four 30 kVA modules provide N+1 for the worked 75 kVA load with 15 kVA of surviving margin. The 120 kVA installed label is not the redundant-load ceiling.
Decision rule: Install four 30 kVA SVX modules for a 75 kVA load so one module can be unavailable while the remaining 90 kVA retains 15 kVA of margin. A different model, load, voltage, battery string, software version or operating state requires a new check against the applicable manufacturer record.
Sources
- Eaton Tripp Lite SVX modular UPS brochure
- Eaton Tripp Lite SVX30PM product specification
- Internal engineering reference: DataCenter/Three-Phase and Data Center Power.md
- our service network, anonymized field-case library, used only where the text identifies a retained field fact.