MQ Power · WhisperWatt Super-Silent

MQ Power DCA-36 WhisperWatt

40 kW standby / 36 kW prime · Diesel · Liquid-cooled

36 kW prime (40 kW standby) portable diesel generator. The largest single-phase WhisperWatt — Isuzu 4LE2X powered at 65 dBA with 79.2-gal tank.

Standby power
40 kW / 36 kW prime
Voltage options
120/240V
Frequency / Phase
60 Hz · 1-phase
Engine
Isuzu 4LE2X · 2.93L
EPA / Emissions
Tier 4 Final
residentialconstruction-largerental-fleettemporary-powercommercial-backup
Configure & QuoteDownload spec sheet

Overview#

The MQ Power DCA-36 WhisperWatt is the flagship of the single-phase WhisperWatt lineup — 36 kW prime (40 kW standby) from an Isuzu 4LE2X 2.93L turbocharged engine, the same powerplant found in the three-phase DCA-45. At 65 dB(A) at 23 feet with a 79.2-gallon integral tank, it delivers the full WhisperWatt experience in a single-phase-only configuration.

The DCA-36 exists because not every 36 kW load needs three-phase power. Large homes, small commercial buildings, and construction sites with heavy single-phase tool loads benefit from the simplified alternator and wiring — no three-phase distribution panel required.

Same engine as the DCA-45#

The Isuzu 4LE2X is the proven mid-range engine in the WhisperWatt lineup. At 2.93L with turbocharging, it achieves Tier 4 Final compliance through EGR and DPF — no DEF required. The engine produces 65.7 bhp at 1800 RPM, the same in both the DCA-36 and DCA-45. The power difference is in the alternator configuration, not the engine.

Common applications#

  • Large residential backup including central HVAC
  • Small commercial building emergency power
  • Construction sites with heavy single-phase tool loads (welders, compressors)
  • Equipment rental for large residential and small commercial jobs

Engineering specifications

Acoustic

Sound @ 7m, full load
66 dBA
Enclosure
Sound-attenuated

Fuel system & runtime

Integral fuel tank
79.2 gal
Fuel use @ full load
2.93 GPH

Documents & downloads

Spec sheets & manuals

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Configure your MQ Power DCA-36 WhisperWatt

Lock the enclosure, fuel system, transfer switch, and add-ons — we'll confirm pricing, availability, and lead time within one business day. Prefer a free-form quote? That option is still here.

Estimate runtime for the MQ Power DCA-36 WhisperWatt

Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.

Estimate runtime on this tank

Estimated runtime

35.0 hours(1.5 days)

Fuel consumption ≈ 2.26 GPH at 75% load. Estimate based on industry-typical 1800 RPM standby curves (≈0.07 GPH/kW at full load). Actual consumption varies by engine, ambient temperature, fuel quality, and tuning.

Service intervals

Manufacturer-recommended intervals for the MQ Power DCA-36 WhisperWatt under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.

Oil & filter
Every 250 hours or 12 months
Air filter
Every 500 hours
Fuel filter
Every 500 hours
Major overhaul
15,000 hours

Common failure modes

What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.

ComponentSymptomTypical hoursSeverity
DPF (Diesel Particulate Filter)Regen warning, back-pressure fault, power derate4,380+moderate
Fuel filtersHard starting, loss of power500+minor
BatteryNo-crank after extended storage4,380+minor
EGR systemFault codes, rough idle, reduced power6,000+minor

Frequently Asked Questions

What's the difference between the DCA-36 and DCA-45?
Both use the same Isuzu 4LE2X engine and share a 79.2-gallon fuel tank, but the DCA-36 is single-phase only (120/240V) while the DCA-45 is switchable single/three-phase (including 208V, 480V). Choose the DCA-36 when your load is purely single-phase — it delivers the same 36 kW prime without the three-phase switching complexity.
Does the DCA-36 require DEF?
No. Like the DCA-45, the DCA-36 uses an Isuzu 4LE2X with EGR and DPF aftertreatment — no DEF required. Tier 4 Final compliance without urea.
What can 36 kW single-phase power?
36 kW single-phase at 120/240V handles a large residential load including central AC, or a small commercial building's essential circuits. It's the maximum single-phase output in the WhisperWatt lineup — above this, three-phase configurations are required.

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