POWERFLOW MARINE

A SMARTER WAY TO SAIL.

A SMARTER WAY T

Built by hand in Port Townsend.

We come in, treat your boat like it is our own, and build the best off-grid propulsion system it can carry. Applications for the 2026 season are open now.

Apply for a build slot

We’re here for the ocean enthusiasts, the explorers,
and adventurers.

Jack and Sonya have been living aboard Gemini, a Passport 42, full time for a decade.

Every fall they return to Port Townsend for build season, then leave again. The systems they install for customers are the same ones they rely on on their own vessel.


Read the full story

OUR PRODUCTS

A stylized yellow and black logo with an abstract design resembling a flower or propeller and a central circle with lines extending outward.

Your boat. Your voyage. Built for both.

Every conversion is sized and configured to the specific vessel. We look at your vessel specs, engine room, battery bank, and where you’re going before we spec anything.

See If This System Fits Your Vessel

Electric Propulsion Motor Systems

A piece of scientific equipment with a metallic base, orange cables, and black components, possibly a pump or laboratory device.

→ SEE MOTOR SYSTEMS

48V DC Diesel Generator

Industrial heat pump unit with the Powerflow Marine logo.

→ SEE THE GENERATOR

LiFePO4 Batteries

A rectangular lithium battery module with handles on both sides and a black top cover with warning labels and connection points.

→ SEE BATTERIES

Accessories

A metallic three-blade fan with a central mounting hub and reflective blades.

→ SEE ACCESSORIES

One builder. One standard.

Man and woman smiling in front of a sailboat.

Hi there, I’m Jack

Jack has been sailing for over 20 years and converted Gemini, his own Passport 42, using the G22 system he builds for customers. He and Sonya completed that conversion in Mexico, then cruised the Sea of Cortez and crossed to French Polynesia on it. He is not guessing about offshore reliability. He has tested it across an ocean.

Powerflow is small by design. Four to six conversions per season, each one built to the specific vessel. Jack is the technician, the manufacturer, and for select projects, the installer, traveling to the vessel when the project warrants it.

Learn How the Build Works
Sailboat with solar strip in clear blue water

The G22 on our own boat has proven what these systems are capable of offshore. We’ve completed a 10,000nm voyage with no fossil fuels. Every build we take on gets that same level of attention because we know what is at stake every time you untie the docklines.

APPLY FOR A BUILD SLOT

Real World Approved

THE BUILD

Stylized blue and black emblem with abstract shapes and sharp angles.

This is what working with us looks like.

Electric propulsion doesn’t fit every use case and build slots are limited. Before any build begins, we spend time understanding your vessel, plans, and whether this system is the right fit. That process starts here.

Start the Conversation
A stylized blue flower with five petals and a circular center.

Go Deeper.

YouTube Channel

Watch our collection of training videos, sailing adventures and all things electrification.

→ SUBSCRIBE TO OUR CHANNEL

User Manuals & Guides

Light Blue Circle with PFM letters in white

Everything you need to get started and operate your products from PFM.

→ DOWNLOAD THE FREE TOOLS

Customer Installs

Sailboat in blue water, blue sky and clouds in the background

Check out our awesome transformations and systems in action.

→ SEE TRANSFORMATIONS

Review our warranty, post purchase agreement and return info below.

Warranty info