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Diesel Generators for Sale: The Complete PowerTech Lineup (8–60 kW)

Q: Are PowerTech diesel generators DEF free?

Yes — every PowerTech diesel generator is DEF free except the 60 kW PTJ-60, which meets Tier 4 Final emissions standards. DEF-free operation means simpler maintenance and no diesel exhaust fluid system to manage on the road.

If you’re searching for diesel generators for sale, the options can feel endless until you need one built for a vehicle. Mobile medical units, food trucks, luxury coaches, and command vehicles demand more than an off-the-shelf standby unit. They need compact, vibration-tested, continuous-duty power that installs cleanly and runs quietly. That’s exactly what the PowerTech diesel lineup was engineered for.

In this guide, we’ll walk through PowerTech’s full range of open and enclosed diesel generators, from 8 kW to 60 kW, and help you decide which model fits your build.

Why Choose a Diesel Generator for Mobile Applications?

Diesel remains the go-to fuel for commercial mobile power, and for good reason. Diesel engines deliver strong torque at lower RPMs, which translates to better fuel efficiency and longer engine life under continuous loads. For vehicles that run their generator all day, a bloodmobile keeping refrigeration cold, a food truck running fryers and A/C, durability matters.

Diesel also simplifies logistics. Many specialty vehicles already run diesel chassis engines, so a diesel generator can share the vehicle’s fuel supply, eliminating a second fuel system. And nearly every generator in the PowerTech diesel lineup is DEF-free (all models except the PTJ-60), which means no diesel exhaust fluid tank, no DEF sensors, and one less maintenance item on the road.

The PowerTech Diesel Generator Lineup

PowerTech builds diesel generators for sale in two configurations: open units for installations with existing compartment ventilation, and enclosed units with sound-attenuated housings for noise-sensitive applications. Every unit is designed and manufactured in the USA specifically for vehicle mounting. Built for demanding mobile applications, our generators are trusted by OEMs across industries including emergency response, mobile medical, specialty vehicles, utility, military, and commercial fleets. Each generator is engineered for reliable continuous operation, long service life, and easy integration into custom vehicle builds.

With a focus on durability, compact footprints, and dependable power output, PowerTech generators are designed to perform in the toughest environments. Backed by decades of engineering experience and responsive customer support, every generator delivers the quality and reliability professionals depend on in the field.

Open Diesel Generators (12–30 kW)

Open-frame diesel generators are the lightweight, cost-effective choice when your vehicle build includes its own generator compartment. The open design allows rapid heat dissipation and easy service access.

PT-12000 (12 kW Open Diesel) — A compact workhorse for smaller specialty vehicles that need dependable continuous power without the footprint of larger units.
PTI-20 (20 kW Open Diesel) — One of PowerTech’s most popular models for commercial and industrial mobile applications. Its engineered airflow system pulls cool air across critical components before exiting through the radiator, keeping temperatures controlled during long duty cycles. Dimensions: 49 1/2″ L x 26 1/8″ W x 29 9/16″ H.
PTI-30 (30 kW Open Diesel) — 30,000 watts of commercial-grade mobile power in a lightweight open-style design, built for high-demand operations like mobile medical and multi-appliance kitchen builds. Dimensions: 51 1/2″ L x 26 5/8″ W x 30″ H.

View All Open Diesel Generators

Enclosed Diesel Generators (8–60 kW)

When your application demands quiet, think patient-facing medical units, luxury coaches, or broadcast vehicles- PowerTech’s enclosed diesel generators pair commercial-grade power with sound-attenuated housings and engineered airflow.

PTK-8ENC (8 kW Enclosed) — The most compact enclosed diesel in the lineup, ideal for smaller builds where space and noise are both at a premium.
PTK-12ENC (12 kW Enclosed) — 12 kW of dependable power in a fully enclosed, sound-attenuated package built for specialty and mobile applications.
PT-12KSI (12 kW Enclosed) — A quiet 12 kW option with sound-isolating construction for noise-sensitive installations.
PTI-20ENC / PTI-20SI (20 kW Enclosed) — Enclosed versions of the proven 20 kW platform, with efficient airflow systems that reduce operational noise without sacrificing cooling.
PTI-20SS (20 kW Super Silent) — The quietest model PowerTech builds. Fully enclosed with brushed stainless steel doors and a remote radiator, the PTI-20SS delivers a breakthrough in noise reduction and thermal efficiency, a favorite for mobile medical and luxury coach builds.
PTI-30ENC / PTI-30SI (30 kW Enclosed) — 30 kW of quiet, commercial-grade power with a thoughtfully engineered enclosure that manages airflow while cutting noise.
PTJ-60SI (60 kW Enclosed) — 60 kW of low-noise power with advanced sound-isolating technology, built with commercial-grade components and meeting Tier 4 Final emissions standards for heavy-duty specialty applications.

View All Enclosed Diesel Generators

How to Choose the Right Diesel Generator

Before comparing diesel generators for sale, work through these four questions:

What’s your total load? Add up every appliance, HVAC unit, and piece of equipment that could run simultaneously, then leave headroom. A food truck might run comfortably on 12–20 kW, while a mobile surgical unit may need 30 kW or more.
Open or enclosed? If your vehicle has a ventilated, sound-treated generator compartment, an open unit saves weight and cost. If the generator mounts are exposed or noise matters, choose enclosed.
How much does noise matter? For patient care, broadcasting, or upscale hospitality, the super silent PTI-20SS or an SI-series enclosed model is worth the investment.
What are your space constraints? Vehicle builds live and die by inches. PowerTech publishes full technical specifications and dimensions for every model, and builds custom configurations when a standard footprint won’t fit.

What Sets PowerTech Diesel Generators Apart

Plenty of companies list diesel generators for sale. Few build them specifically for mobile applications. PowerTech generators are engineered from the ground up for vehicle mounting, with engineered airflow systems that keep components cool in tight compartments, DEF-free operation on nearly every model, commercial-grade construction rated for continuous duty, and custom options, from stainless enclosures to remote radiators, when your build calls for something beyond standard.

Because PowerTech works directly with OEM coach builders, upfitters, and specialty vehicle manufacturers, every generator ships ready to integrate: wiring, mounting, exhaust routing, and fuel supply are all designed with the installer in mind.

Frequently Asked Questions

What sizes of diesel generators does PowerTech offer?

PowerTech’s diesel lineup ranges from 8 kW to 60 kW, in both open-frame and enclosed sound-attenuated configurations, covering everything from compact specialty vehicles to heavy-duty mobile medical and command units.

Are PowerTech diesel generators DEF free?

Yes, every PowerTech diesel generator is DEF-free except the 60 kW PTJ-60, which meets Tier 4 Final emissions standards. DEF-free operation means simpler maintenance and no diesel exhaust fluid system to manage on the road.

What's the quietest diesel generator PowerTech makes?

The PTI-20SS Super Silent 20 kW is the quietest model in the lineup, combining a fully enclosed housing, brushed stainless steel doors, and a remote radiator for maximum noise reduction and thermal efficiency.

Should I buy an open or enclosed diesel generator?

Choose an open unit if your vehicle has a dedicated, ventilated generator compartment; you’ll save weight and cost. Choose an enclosed unit if the generator is exposed or your application is noise-sensitive, like mobile medical or luxury coach builds.

Can PowerTech customize a generator for my vehicle build?

Yes. PowerTech regularly builds custom configurations for OEM coach builders and upfitters, including custom enclosures, remote radiators, and application-specific mounting and dimensions.

Find Your Diesel Generator

Whether you’re upfitting a single food truck or spec’ing generators across an OEM production line, the right diesel generator is the one built for the way you’ll actually use it. Explore the full lineup of PowerTech diesel generators for sale, compare open and enclosed models side by side, or talk to the PowerTech team about a custom configuration for your build.

Ready to power your next build? Browse all diesel generators or contact PowerTech for sizing help and a quote.

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