MQ Power · WhisperWatt Super-Silent

MQ Power DCA-20 WhisperWatt

22 kW standby / 20 kW prime · Diesel · Liquid-cooled

20 kW prime (22 kW standby) portable diesel generator. Isuzu-powered WhisperWatt single-phase at 65 dBA — same power as the DCA-25, single-phase only.

Standby power
22 kW / 20 kW prime
Voltage options
120/240V
Frequency / Phase
60 Hz · 1-phase
Engine
Isuzu 4LE2T · 2.179L
EPA / Emissions
Tier 4 Final
residentialconstruction-smallconstruction-largerental-fleettemporary-powercommercial-backup
Configure & Quote

Overview#

The MQ Power DCA-20 WhisperWatt is a 20 kW prime (22 kW standby) portable diesel generator with Isuzu power and single-phase-only 120/240V output. It matches the DCA-25's prime power rating but omits the three-phase capability, serving applications that only need single-phase.

At 65 dB(A) at 23 feet with a 41.7-gallon integral tank, the DCA-20 delivers the full WhisperWatt experience in the single-phase configuration. The Isuzu engine at 1800 RPM provides the same fuel efficiency and long-life advantages as the rest of the Isuzu-powered lineup.

Single-phase vs three-phase — when the DCA-20 is the right spec#

If the load is purely single-phase (residential, small commercial, lighting), the DCA-20 is the correct specification over the DCA-25. The single-phase alternator is optimized for that duty, and you avoid paying for three-phase capability that won't be used.

Common applications#

  • Full residential emergency backup including small central AC
  • Small commercial building backup (retail, restaurants, offices)
  • Construction site lighting and small tool power
  • Equipment rental for residential contractors

Engineering specifications

Acoustic

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

Fuel system & runtime

Integral fuel tank
41.7 gal

Ready to order this model?

Configure your MQ Power DCA-20 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.

Configure & Quote →Just request a quote

Estimate runtime for the MQ Power DCA-20 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

35.1 hours(1.5 days)

Fuel consumption ≈ 1.19 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.

Frequently Asked Questions

What's the difference between the DCA-20 and DCA-25?
Both deliver 20 kW prime, but the DCA-20 is single-phase only (120/240V) while the DCA-25 is switchable single/three-phase (including 208V, 480V). Choose the DCA-20 when you only need single-phase output — the simplified alternator configuration is optimized for that use case.
Can the DCA-20 power a house with central AC?
At 20 kW, the DCA-20 can handle a full residential load including a small central AC system (up to about 3 tons). Larger homes with 4-5 ton AC units will exceed the available power during compressor startup.

Similar models

MQ Power

MQ Power DCA-15 WhisperWatt

WhisperWatt 15 kW — Kubota D1503 at 1800 RPM, 64 dBA at 7m, 120/240V single-phase, 16.4-gal tank. Tier 4 Final certified, no aftertreatment.

14.7 kW standby · Diesel · Liquid-cooled

14 kW prime (14.7 kW standby) portable diesel generator. Kubota D1503-powered WhisperWatt single-phase at 64 dBA — Tier 4 Final certified.

Tier 4 FinalSingle-phaseresidentialconstruction-small
MQ Power MQ Power DCA-25 WhisperWatt 22 kW liquid-cooled standby generator

MQ Power

MQ Power DCA-25 WhisperWatt

WhisperWatt by Denyo — 65 dBA at 7m, quietest in class. Isuzu 4LE2T at 1800 RPM, 1.62 gph, switchable single/three-phase, Tier 4 Final.

22 kW standby · Diesel · Liquid-cooled

25 kVA (20 kW prime) portable diesel generator. Quiet WhisperWatt Super-Silent construction workhorse for rental fleets, job sites, and temporary power.

Tier 4 Final3-phaseconstructionrental-fleet

MQ Power

MQ Power DCA-36 WhisperWatt

The largest single-phase WhisperWatt — 36 kW prime from an Isuzu 4LE2X, 65 dBA at 7m, 120/240V only, 79.2-gal tank. Same engine as the DCA-45 but optimized for single-phase loads.

40 kW standby · 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.

Tier 4 FinalSingle-phaseresidentialconstruction-large

Need service or parts for the MQ Power DCA-20 WhisperWatt?

We service every major OEM and stock genuine parts for the most common models.

Get A QuoteOr call (831) 375-1463