T20U: 20 kW Mitsubishi Diesel Generator

When small commercial operations, remote facilities, or light industrial sites need compact, dependable backup power, the T20U delivers proven Mitsubishi reliability in a tight footprint. Manufactured by SDMO and powered by the naturally aspirated Mitsubishi S4Q2-SD engine paired with a brushless AT00404T alternator, this ISO 8528 Performance Class G2 generator set is built for efficient, straightforward operation.

• Engine: Mitsubishi S4Q2-SD, 2.51L displacement, 4-cylinder inline, naturally aspirated, 1800 RPM, mechanical governor
• Output: 20 kW / 25 kVA standby (ESP); 18.2 kW / 22.7 kVA prime (PRP), three-phase, 0.8 power factor
• Voltage options: 208/120V, 220/127V, 440/254V, and 480/277V, 60 Hz configurations
• Alternator: AT00404T, brushless, Class H insulation, IP23 protection, 4-pole, single bearing, direct coupling, +/-1% voltage regulation, THD below 3.6%
• Fuel consumption: 7.4 L/hr at 100% load; 5.6 L/hr at 75% load; 4.1 L/hr at 50% load
• Controller: APM303 standard with LCD display, Modbus RTU on RS485, manual and automatic modes, 12 stored events
• Starting system: 12V DC starter, 12V charging alternator, DC starting battery with electrolyte included
• Compact version dimensions: 1700mm x 896mm x 1121mm, dry weight 549 kg, integral 100-liter fuel tank
• Soundproofed version (M127): 2080mm x 960mm x 1415mm, 780 kg, 75 dB(A) at 1m, 65 dB(A) at 7m
• Standards: ISO 8528-1, Performance Class G2, delivered with oil and coolant rated to -30°C
• EPA Compliant: Export Only
• Version: Open Skid (Also Available Enclosed)

Available in both compact open and soundproofed M127 enclosure versions, the T20U is a versatile and economical solution for facilities across Latin America, the Caribbean, and international markets where right-sized power and quiet operation are equally important.

T20U Engine and Fuel Performance

The Mitsubishi S4Q2-SD is a naturally aspirated, water-cooled 4-cylinder engine with a 22:1 compression ratio, producing a maximum standby output of 27.3 kW at rated RPM. Its compact 2.51-liter displacement delivers a favorable fuel efficiency profile, with oil capacity of just 6.5 liters and a minimal oil consumption rate of 0.08 L/hr at full load, keeping operating costs low across extended run cycles.

T20U Alternator and Control Panel Options

The AT00404T brushless alternator delivers a continuous nominal rating of 19 kVA at 40°C and a standby rating of 25.8 kVA at 27°C, with 89.5% efficiency at full load and total harmonic distortion below 3.6% under load. 

The standard APM303 controller handles both manual and automatic operation, displaying phase-to-neutral and phase-to-phase voltages, active power, power factor, kWh energy metering, oil pressure, coolant temperature, and fuel level, with Modbus RTU communication on RS485 for remote supervision. 

The optional TELYS controller upgrades the experience with a large scroll-wheel display, USB and PC connectivity, and a more comprehensive alarm and fault management interface.

Containment DW Enclosure Option for the T20U

The optional M127 DW containment enclosure expands the footprint to 2160mm x 966mm x 1582mm while increasing the integrated fuel tank capacity to 230 liters, significantly extending runtime between refueling stops. 

Acoustic pressure is maintained at 75 dB(A) at 1 meter and 65 dB(A) at 7 meters, making the soundproofed T20U well suited for noise-sensitive commercial environments, residential-adjacent sites, and indoor mechanical rooms requiring a self-contained, double-wall bunded fuel system.