Online Double-Conversion UPS Systems

Q: Can modular UPS power modules be replaced while the system is live?

Yes. In an N+1 modular UPS, individual power modules can be removed and replaced within 5 minutes while the remaining modules continue powering the load without any interruption.

Q: Do your UPS systems work with standby diesel generators?

Yes. Our UPS units feature soft-walk-in rectifier loading (adjustable 1 to 30 seconds) and low input THD-i (< 3%), preventing generator voltage fluctuations or governor hunting.

High-efficiency 3-phase power protection engineered for data centres, hospitals and industrial automation

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Online Double-Conversion UPS Systems

Nairobi Power Engineers provides enterprise-grade three-phase Online Double-Conversion UPS systems ranging from 10 kVA standalone tower units to 800 kVA modular parallel configurations. Certified to IEC 62040-3 VFI-SS-111, our UPS systems isolate critical equipment completely from utility power sags, surges, brownouts, and frequency shifts.

With three-level IGBT inverter topology, unity output power factor (kVA = kW), and efficiency up to 96.5% in double-conversion mode (and 99% in ECO mode), our UPS systems reduce electrical operating costs while maximizing data centre and hospital uptime.

Equipment & Range Highlights

Modular Architecture • N+X Redundancy

Conceptual online double-conversion ups systems scene; exact specifications vary.

Modular Hot-Swappable 3-Phase UPS Cabinets

High-density modular UPS chassis with hot-swappable 25 kW / 50 kW power modules, decentralized control logic, and built-in static bypass.

Capacity25 kVA – 500 kVA

RedundancyN+1 / N+X Hot Swap

MTTR< 5 Minutes Module Swap

Monolithic Industrial • High Inrush

Conceptual online double-conversion ups systems scene; exact specifications vary.

Heavy-Duty Industrial Monolithic UPS

Robust transformer-based and transformerless monolithic UPS systems designed for harsh factory environments, motor inrush loads, and medical scanners.

Rating10 kVA – 800 kVA

Inrush Withstand150% Overload 1 Min

CoolingRedundant Fan Arrays

Online UPS Technical Reference

Parameter	Specification Details
Operating Principle	True Online Double Conversion (VFI-SS-111 per IEC 62040-3)
Rated Power Spectrum	10, 20, 30, 40, 60, 80, 100, 160, 200, 300, 400, 500, 800 kVA
Input Power Factor	≥ 0.99 (Ultra-low grid distortion)
Output Power Factor	Unity PF = 1.0 (Full kW capacity available for server loads)
Parallel Capability	Up to 8 units in parallel for capacity expansion or N+1 redundancy
Communications	RS485 Modbus, SNMP v3 Web card, Dry contact relay outputs, USB

Engineering & Build Highlights

Three-level IGBT inverter topology achieves up to 96.5% true double-conversion efficiency
Smart ECO Mode operation achieves 99% efficiency while transferring to inverter in < 2ms upon grid fault
Dual-input design supports independent connections for utility rectifier feed and static bypass line
Intelligent battery testing routine periodically verifies battery health without risking load drop
Touchscreen colour LCD displays real-time animated mimic power flow, load %, and alarm logs
Generator compatibility mode dampens frequency oscillations during diesel generator transfer

Target Applications & Sectors

Mission-critical data centre server racksHospital operating theatres & imaging suites (MRI / CT)Commercial banking transaction servers & disaster recovery sitesAirport radar, air traffic control & baggage automationIndustrial plant PLC & DCS supervisory control roomsTelecom switching centres & fiber optical networks

Yes. In an N+1 modular UPS, individual power modules can be removed and replaced within 5 minutes while the remaining modules continue powering the load without any interruption.

Yes. Our UPS units feature soft-walk-in rectifier loading (adjustable 1 to 30 seconds) and low input THD-i (< 3%), preventing generator voltage fluctuations or governor hunting.

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