What engine does the VD125-04FT4MP use?

The Volvo Penta TAD582VE — a 5.13-liter, four-cylinder turbocharged and charge-air-cooled diesel. The TAD582VE is the higher-output calibration of the 5.1L VP generator platform shared with the VD100-04FT4MP (TAD581VE). Both engines share the same displacement, cylinder count, and 5.1-liter architecture; the 582 calibration produces 125 kWe through higher fuel delivery and boost mapping. EPA Tier 4 Final and EU Stage 5 dual certification applies. Rated power is available to 4,921 ft (1,500 m) at 122°F (50°C). The 18.5-gallon DEF tank is shared with the VD100 and VD150.

What controller does the VD125-04FT4MP use?

The DSE DCP7310 Digital Control Panel, with CAN Bus J1939 engine communication, digital metering, RS-485 interface, 8 programmable contact inputs, 10 contact outputs, and NFPA 110 Level 1 compatibility. The panel is cULus Listed and CE Approved with IP 65 ingress protection (with supplied gasket). A 24V battery system and battery charger are included. The VD125 uses a UCI274E alternator — the E variant in the UCI274 frame series, one step above the UCI274D in the VD100.

How does the VD125-04FT4MP compare to the VD100-04FT4MP and VD150-04FT4MP?

The VD100, VD125, and VD150 share the same 230.5 × 90 in trailer footprint. The VD100 (TAD581VE, 6.99 gph, 10,500 lbs) steps to VD125 (TAD582VE, 8.61 gph, 10,600 lbs) — adding 25 kWe for 100 lbs and 1.62 gph. The VD150 (TAD881VE, 7.70L, 10.7 gph, 11,125 lbs) is a platform change: different engine family, more displacement, 525 lbs heavier. All three share the 18.5-gal DEF tank. The 230.5 × 90 in trailer platform is footprint-compatible across the three models, giving flexibility if load requirements change after site layout is set.

What are the fuel capacity and runtime of the VD125-04FT4MP?

The 250-gallon integral fuel tank at full load (8.61 gph) provides approximately 29 hours of runtime. At 75% load (6.58 gph), runtime extends to approximately 38 hours. The 18.5-gallon DEF tank aligns with approximately 2–3 fuel cycles before a DEF refill is needed. Combustion air draw is 364 CFM; ventilation air requirement is 11,237 CFM (same as VD100); heat rejected to the coolant circuit is 277,080 BTU/hr; exhaust exits at 903°F at 851 CFM.

Blue Star Power Systems · Volvo Penta Diesel Mobile

Blue Star VD125-04FT4MP

125 kW standby · Diesel · Liquid-cooled

125 kW Tier 4 Final / EU Stage 5 mobile trailer diesel generator built by Blue Star Power Systems. Volvo Penta TAD582VE four-cylinder engine, Stamford UCI274E alternator, DSE DCP7310 controller, 250-gallon integrated fuel tank.

Standby power: 125 kW / 125 kW prime
Voltage options: 120/240V, 120/208V, 277/480V
Frequency / Phase: 60 Hz · 1/3-phase
Engine: Volvo Penta TAD582VE · 5.13L
EPA / Emissions: Tier 4 Final
Alternator: Stamford UCI274E

Commercialtemporary-powerGovernment Media & Telecompump-station

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Overview#

The Blue Star VD125-04FT4MP is a 125-kilowatt EPA Tier 4 Final / EU Stage 5 mobile trailer diesel generator powered by the Volvo Penta TAD582VE — a 5.13-liter, four-cylinder turbocharged and charge-air-cooled engine. It is the higher-output calibration of the 5.1-liter VP platform shared with the VD100-04FT4MP, producing 125 kWe on an identical 230.5 × 90 in trailer footprint at 100 lbs more.

Blue Star Power Systems pairs the TAD582VE with a Stamford UCI274E alternator and DSE DCP7310 controller, mounted on an aluminum road trailer with a 250-gallon integral fuel tank and 18.5-gallon DEF tank. At 10,600 lbs, the VD125-04FT4MP is effectively the same deployment proposition as the VD100 — same trailer, same DEF tank, 25 additional kilowatts.

TAD581 vs TAD582: Same Block, Higher Calibration#

The VD100 (TAD581VE) and VD125 (TAD582VE) are calibration variants of the same Volvo Penta 5.1-liter generator engine. The numerical suffix (581 vs 582) identifies output calibration rather than a different engine. From a parts and service standpoint, the two engines share the same block, head, and major assemblies; fuel injection mapping and boost calibration differentiate the output levels. This makes the VD125 an attractive footprint upgrade over a VD100 when initial load estimates prove conservative.

When to specify the VD125-04FT4MP#

115–125 kW temporary or standby power where the VD100 footprint is already established
Sites up to 4,921 ft elevation at ambient temperatures to 122°F
Applications requiring EU Stage 5 dual certification alongside EPA Tier 4 Final
Projects where the 230.5 × 90 in footprint is established and a 100 kWe unit is insufficient
Single-phase or three-phase outputs at 120/240V, 120/208V, or 277/480V

Our service experience#

The TAD582VE and TAD581VE share service intervals and parts lists. For high-utilization deployments (rental fleet, construction sites with long shifts), the 250-gallon fuel tank at 8.61 gph provides a practical 29-hour window before diesel refueling — plan DEF management alongside fuel logistics. Exhaust temperature of 903°F is moderate for this output class. The UCI274E alternator is the E-wind variant of the UCI274 frame; confirm voltage configuration at commissioning (12-lead WYE for 480V standard).

Engineering specifications

Physical

Length: 230.5 in
Width: 90 in
Height: 121.5 in
Dry weight: 10,600 lb

Acoustic

Sound @ 7m, full load: 68 dBA
Enclosure: Open

Fuel system & runtime

Integral fuel tank: 250 gal
Fuel use @ full load: 8.61 GPH
Fuel use @ 75% load: 6.58 GPH
Fuel use @ 50% load: 4.82 GPH
DEF tank: 18.5 gal

Thermal & ventilation

Heat to coolant: 277,080 BTU/hr
Heat radiated: 154,800 BTU/hr
Exhaust flow: 851 CFM
Exhaust temp: 903 °F
Combustion air: 364 CFM
Ventilation air: 11,237 CFM

Documents & downloads

Spec sheets & manuals

Spec sheet (datasheet)

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Estimate runtime for the Blue Star VD125-04FT4MP

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

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Generator size

Fuel

Fuel tank capacity

gal

Load

Override full-load GPH (optional)

GPH

Estimated runtime

37.6 hours(1.6 days)

Fuel consumption ≈ 6.64 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 Blue Star VD125-04FT4MP under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.

Oil & filter: Every 500 hours or 12 months
Coolant change: Every 6000 hours
Air filter: Every 1000 hours
Fuel filter: Every 500 hours
Major overhaul: ≈ 20,000 hours
Load bank test: Every 12 months

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.

Component	Symptom	Typical hours	Severity
DEF system (SCR catalyst)	Derate warning, NOx fault, DEF quality alert	4,380+	moderate
Fuel quality	Injector fouling, hard starting	4,380+	moderate
Battery	Failed to start, slow crank	8,760+	minor

Frequently Asked Questions

What engine does the VD125-04FT4MP use?: The Volvo Penta TAD582VE — a 5.13-liter, four-cylinder turbocharged and charge-air-cooled diesel. The TAD582VE is the higher-output calibration of the 5.1L VP generator platform shared with the VD100-04FT4MP (TAD581VE). Both engines share the same displacement, cylinder count, and 5.1-liter architecture; the 582 calibration produces 125 kWe through higher fuel delivery and boost mapping. EPA Tier 4 Final and EU Stage 5 dual certification applies. Rated power is available to 4,921 ft (1,500 m) at 122°F (50°C). The 18.5-gallon DEF tank is shared with the VD100 and VD150.
What controller does the VD125-04FT4MP use?: The DSE DCP7310 Digital Control Panel, with CAN Bus J1939 engine communication, digital metering, RS-485 interface, 8 programmable contact inputs, 10 contact outputs, and NFPA 110 Level 1 compatibility. The panel is cULus Listed and CE Approved with IP 65 ingress protection (with supplied gasket). A 24V battery system and battery charger are included. The VD125 uses a UCI274E alternator — the E variant in the UCI274 frame series, one step above the UCI274D in the VD100.
How does the VD125-04FT4MP compare to the VD100-04FT4MP and VD150-04FT4MP?: The VD100, VD125, and VD150 share the same 230.5 × 90 in trailer footprint. The VD100 (TAD581VE, 6.99 gph, 10,500 lbs) steps to VD125 (TAD582VE, 8.61 gph, 10,600 lbs) — adding 25 kWe for 100 lbs and 1.62 gph. The VD150 (TAD881VE, 7.70L, 10.7 gph, 11,125 lbs) is a platform change: different engine family, more displacement, 525 lbs heavier. All three share the 18.5-gal DEF tank. The 230.5 × 90 in trailer platform is footprint-compatible across the three models, giving flexibility if load requirements change after site layout is set.
What are the fuel capacity and runtime of the VD125-04FT4MP?: The 250-gallon integral fuel tank at full load (8.61 gph) provides approximately 29 hours of runtime. At 75% load (6.58 gph), runtime extends to approximately 38 hours. The 18.5-gallon DEF tank aligns with approximately 2–3 fuel cycles before a DEF refill is needed. Combustion air draw is 364 CFM; ventilation air requirement is 11,237 CFM (same as VD100); heat rejected to the coolant circuit is 277,080 BTU/hr; exhaust exits at 903°F at 851 CFM.

Compatible equipment

Transfer switches

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Last reviewed: May 6, 2026