POWERFLOW MARINE
A SMARTER WAY TO SAIL.
A SMARTER WAY T
Four systems per season. Built by hand in Port Townsend.
Production opens October — 2025–26 season now accepting applications
→ APPLY FOR A BUILD SLOT
We’re here for the ocean enthusiasts, the explorers,
and adventurers.
Jack and Sonya live aboard Gemini, a Passport 42, full-time — by choice.
Each year they return to Port Townsend for a short production season before departing again.
The systems they build are the same ones they stake their own passages on.
OUR PRODUCTS
Built to your vessel. Not off a shelf.
Every system is configured to the specific vessel, passage plan, and prop shaft it will live on. No two builds are identical.
Electric Propulsion Motor Systems
48V DC Diesel Generator
LiFePO4 Batteries
Accessories
Hear the sound of the wind and the waves.
Our systems are built for blue-water sailors who need their propulsion to work — not just at the marina, but mid-passage in the Tuamotus. Every component is selected and tested by someone who's been there.
OUR SERVICES
What working with Powerflow looks like.
We don't take every inquiry. Before any build begins, we spend time understanding your vessel, your plans, and whether this system is the right fit. That process starts here.
Built by one technician. Used by the same one.
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. He's not guessing about offshore reliability. He's tested it across an ocean.
Powerflow is small by design. Four to six systems per season, each one built to the specific vessel. Jack is the technician, the builder, and for select projects, the installer, traveling to the vessel when the project warrants it.
Go Deeper.
YouTube Channel
Watch our collection of training videos, sailing adventures and all things electrification.
User Manuals & Guides
Everything you need to get started and operate your products from PFM.
Customer Installs
Check out our awesome transformations and systems in action.
Review our warranty, post purchase agreement and return info below.