Yanmar YP8500GNH 8,500-Watt Portable Gas Generator with Honda GX390

Yanmar YP8500GNH 8,500-Watt Portable Gas Generator

The Yanmar YP8500GNH is a heavy-duty portable generator designed for home backup power, demanding jobsites, workshops, farms and other applications requiring reliable high-output electricity. It delivers up to 8,500 starting watts and 7,000 running watts, providing the surge capacity needed to start larger motors, pumps, compressors and power tools.

At the heart of the YP8500GNH is the proven Honda GX390 commercial-grade gasoline engine. Its 389cc design provides dependable starting and consistent performance during extended outages or long working days. A low-oil shutdown system helps protect the engine if the oil level becomes unsafe.

Capacitor voltage regulation helps maintain stable electrical output as connected loads change. This makes the generator suitable for powering essential household circuits, well pumps, refrigerators, freezers, compressors, construction tools and other compatible equipment.

A large 7.9-gallon fuel tank supports up to 12 hours of runtime at 25% load, reducing the frequency of refueling during extended operation. The generator is protected by a heavy-duty welded steel frame and includes a foldable transport handle with 9-inch foam-filled wheels for easier movement and compact storage.

Key Features

• 8,500 starting watts
• 7,000 running watts
• Honda GX390 gasoline engine
• 389cc engine displacement
• Capacitor voltage regulation
• 7.9-gallon fuel tank
• Up to 12 hours of runtime at 25% load
• 30-amp main breaker protection
• Low-oil engine shutdown protection
• Heavy-duty welded steel frame
• Foldable transport and storage handle
• 9-inch foam-filled, never-flat wheels

Ideal Applications

• Home emergency backup power
• Well pumps and essential household circuits
• Construction and contractor jobsites
• Workshops and garages
• Compressors and motor-driven equipment
• Power tools and portable equipment
• Farms, barns and rural properties
• Storm preparation and outage response

Reliable Power for Larger Loads

The YP8500GNH provides the additional starting capacity required by equipment with electric motors. Its combination of 8,500 surge watts and 7,000 continuous watts makes it a practical choice for customers who need more power than a smaller portable generator can provide.

Built for Transport and Frequent Use

The welded steel frame helps protect critical components during transportation and operation. A foldable handle and foam-filled wheels make the generator easier to reposition around a property or jobsite without the inconvenience of flat pneumatic tires.

Why Buy From All Pro Generators?

• Authorized Yanmar dealer
• Factory-new equipment
• Free shipping within the continental United States
• Competitive pricing
• Manufacturer warranty protection
• Knowledgeable product support
• Financing options available

Specifications

Warranty

• Engine: 3-Year Limited Warranty
• Alternator: 5-Year Limited Warranty
• Frame: 10-Year Limited Warranty

Warranty coverage is subject to Yanmar and Honda warranty terms, proper installation, authorized applications and required maintenance. Refer to the applicable warranty documentation for complete coverage, exclusions and claim procedures.

Frequently Asked Questions

How much power does the Yanmar YP8500GNH produce?

The YP8500GNH produces up to 8,500 starting watts and 7,000 running watts. Starting watts provide the temporary surge needed to start compatible motor-driven equipment, while running watts represent the continuous available output.

What engine does this generator use?

It is powered by a commercial-grade Honda GX390 gasoline engine with 389cc displacement.

How long can the YP8500GNH run?

Yanmar rates the generator for up to 12 hours of runtime at 25% load. Actual runtime depends on the connected load, fuel quality, maintenance, environmental conditions and operating practices.

How large is the fuel tank?

The generator includes a 7.9-gallon gasoline fuel tank.

Can it be used for home backup power?

Yes. It can power properly sized essential loads such as refrigerators, freezers, lights, well pumps and selected household circuits. A qualified electrician should install an approved transfer switch or interlock system before connecting a portable generator to a building electrical system.

Can it operate an entire house?

That depends on the home's starting and running electrical loads. The generator provides 7,000 continuous watts, so customers should calculate their essential circuits and motor-starting requirements before purchasing.

Does it have voltage regulation?

Yes. The YP8500GNH uses capacitor voltage regulation to help maintain stable electrical output as connected loads change.

Does it include low-oil protection?

Yes. The Honda GX390 engine includes low-oil shutdown protection to help prevent engine damage caused by an unsafe oil level.

Is the generator easy to move?

The generator includes a foldable handle and 9-inch foam-filled wheels. The wheels are designed to eliminate the inconvenience of flat pneumatic tires during transport or storage.

Can this generator be operated indoors or in a garage?

No. Gasoline generators produce deadly carbon monoxide. Operate the generator outdoors only, far away from doors, windows, vents and occupied structures, following all manufacturer safety instructions.

Does it include a transfer switch?

No. Transfer equipment, power inlet boxes, cords and related installation components are generally sold separately unless specifically listed as included in the selected package.