Generac Protector Series 15,000 Watt (15kW) Three-Phase Liquid Cooled Diesel Standby Generator (120 / 240V) Extended Run Tank

The Generac RD01525 is a rugged and reliable 15kW diesel-powered standby generator, part of Generac’s advanced Protector™ Series built to provide dependable backup power for residential and light commercial applications. Engineered with a focus on code compliance, long-term durability, and intuitive control, this model is an ideal solution for properties that require a compact yet powerful diesel generator with extended runtime capabilities.

At its core, the RD01525 is powered by a 4-cylinder, liquid-cooled diesel engine operating at 1800 RPM, offering enhanced efficiency and longevity compared to higher-speed models. The engine is designed specifically for generator use, ensuring consistent performance under continuous load. The system delivers 62 amps at 120/240V single-phase and is available in multiple voltage configurations, including three-phase options, making it versatile for a variety of installation types.

This generator comes equipped with Generac’s Evolution™ Controller, a multilingual digital interface with color-coded, backlit buttons and a two-line LCD display, offering real-time status updates, maintenance tracking, and easy configuration. The system is Mobile Link™ compatible (sold separately), allowing for remote monitoring via smartphone or computer.

One of the standout features of this model is its Quiet-Test™ self-test mode, which allows the generator to run at a lower RPM during its weekly self-checks. This mode reduces both fuel consumption and operating noise, which is rated at a low 65 dB(A) during exercise mode and 70 dB(A) during full load operation quiet enough for use near homes and occupied spaces.

Fuel efficiency is a strong suit of the RD01525, consuming approximately 0.79 gallons per hour at half load and 1.48 gallons per hour at full load. The generator is housed in a durable gray steel enclosure and includes a double-walled, UL 142-listed base fuel tank that minimizes the risk of leaks and simplifies regulatory compliance.

Installation and servicing are simplified thanks to removable side panels, an external viewing window, and an accessible breaker position. The unit is UL 2200 listed, EPA emissions certified, and backed by Generac’s 5-year limited warranty.

Key Features:

• 15kW Diesel Standby Output – Ideal for residential estates and small business facilities

• 1800 RPM, 4-Cylinder Engine – Built for generator use with long service life and reduced fuel use

• Multiple Voltage Configurations – Supports single-phase and three-phase installations

• Evolution™ Digital Controller – Multilingual LCD interface with smart alerts and status readouts

• Quiet-Test™ Mode – Weekly self-checks at lower RPM for quieter, more fuel-efficient testing

• Low Noise Levels – Just 65 dB(A) in exercise mode and 70 dB(A) at full load

• Efficient Fuel Use – Consumes only 1.48 gal/hr at full load

• UL 142 Double-Walled Base Tank – Integrated fuel containment and code-ready design

• Removable Doors & Viewing Window – Easy access for maintenance and operation checks

• 5-Year Limited Warranty – Backed by Generac’s nationwide service network

The Generac RD01525 provides serious standby power with the efficiency and durability of a diesel platform—making it a smart investment for those who need reliable, code-compliant power in compact, mission-critical applications.

Overview:

• Product Category: Home Standby Generator
• Generator Features: Low Oil Alert/Shutdown
• Product Weight: 1757 lbs
• Length: 81"
• Width: 31"
• Height: 61"

Specifications:

• Voltage: 120, 240V
• Frequency: 60 Hz
• Running Wattage: 15,000 Watts
• Fuel Type: Diesel
• Amperage: 45A
• Decibel Rating @ 7m: 70 dbA
• Enclosure Material: Aluminum
• Mounting Pad: Concrete (Not Included)
• Cooling Type: Liquid Cooled
• Wi-Fi: Yes

Engine:

• Engine Brand: Mitsubishi
• Starting System: 12v Auto Start
• Cubic Capacity: 2500 CC
• Horsepower: 26.4 HP
• RPM: 1800 RPM
• Low Oil Alert/Shutdown: Yes

Product Assurance:

• Certifications: UL
• EPA Compliant
• Made in America
• Approved for Commercial Use
• Warranty: 5 Year Commercial, 5 Year Commercial Engine, 5 Year Residential, and 5 Year Residential Engine