Seakeeper 4.5 Now Available in Florida or NC

Looking to buy a Seakeeper 4.5? As the premier Seakeeper dealers specializing in this product line, we have had the Seakeeper 4.5 for sale at our locations in FL and NC since its initial release.

We now have the Seakeeper 4.5 for sale at Tri Sea Stabilizers!

Seakeeper 4.5

Seakeeper 4.5 is the smallest AC model Seakeeper unit


Buy Seakeeper 4.5

The Seakeeper 4.5 is suitable for boats between 40 and 46 feet, runs exclusively AC power and can be installed virtually anywhere on board. Need more information? Contact us now.

$54,200 ( MSRP 2025)

AVG INSTALL COST $20,000

AVG TOTAL COST $74,200

* Seakeeper 4.5 Cost not Including applicable Tax, shipping, potential yard and transport fee’s depending on location.

Not sure if you should buy Seakeeper 4.5 or a different model?

Check out the information below which should help, but if the Seakeeper 4.5 doesn’t seem to be the correct model for your needs contact us now for help on making the right choice, or look at information on other Seakeepers on our Seakeeper price page.

Seakeeper 4.5 installation

  • Boat size: 40 to 46 feet and up to 18 tons (36,000 pounds)

  • Unit weight: 736 lbs (333 kg)

  • Dimensions: 27 inches length, 28 inches width, and 20 inches height

  • Power: The Seakeeper 4.5 requires a ac power source to operate

  • Warranty: 2 years or 2000 hours or whichever comes first (with option to extend)

  • Max rated speed: 9,700 RPM

  • Angular momentum at max rated RPM: 4,500 N-M-S

  • Anti rolling torque at max rated RPM: 11,780 N-M

  • Spool-up time to max rated RPM: 35 minutes (9,300 RPM)

  • Spool-up time to stabilization: 19 minutes (6,975 RPM)

  • Power consumption spool-up power: 1950 Watts Max

  • Operating power: 950-1600 Watts (Sea State Dependent)


The Seakeeper 4.5 cutting-edge stabilization system

It is designed for boats ranging from 30 to 42 feet. With its advanced gyroscopic technology, the Seakeeper 4.5 effectively eliminates up to 95% of boat roll, enhancing comfort and safety for those onboard.

This system operates quietly and efficiently, utilizing minimal power while providing maximum stabilization even in choppy conditions. Weighing in at around 800 pounds, the Seakeeper 4.5 can be installed in various locations within the vessel, ensuring flexibility in installation without compromising performance.

The user-friendly interface allows boat owners to easily monitor the system’s status, making it ideal for both experienced mariners and newcomers alike. Enjoying a smooth ride enhances the overall boating experience, making the Seakeeper 4.5 an invaluable addition for those seeking stability on the water.

Choosing Tri Sea Stabilizers for your Seakeeper 4.5 installation ensures you get expert guidance and support from qualified professionals familiar with local waters from the Florida Keys to Wilmington, NC. Experience the difference seamless sailing can make with the Seakeeper 4.5.

What is the difference between the Seakeeper 4 and the Seakeeper 4.5?

The Seakeeper 4 and Seakeeper 4.5 are both effective stabilization systems designed to reduce boat roll, but they possess key differences that cater to varying needs.

  1. Stabilization Capacity: The Seakeeper 4 is designed for vessels up to 40 feet in length, providing stabilization for smaller boats. In contrast, the Seakeeper 4.5 supports slightly larger vessels, accommodating boats up to 45 feet, which makes it suitable for a broader range of applications.

  2. Power and Performance: While both systems utilize advanced gyroscopic technology, the Seakeeper 4.5 typically offers increased stabilization power compared to the Seakeeper 4, making it more effective in challenging sea conditions. This enhancement translates to improved performance in larger or heavier vessels.

  3. Weight and Size: The Seakeeper 4 is smaller and lighter than the Seakeeper 4.5, which may be an important consideration for certain boat designs and available installation space. The 4.5, being larger, may require more space for installation.

  4. Installation Requirements: Due to their size differences, the installation processes and structural requirements may vary. The Seakeeper 4 is generally easier to install in compact spaces, while the 4.5 might necessitate more extensive modifications.

  5. Cost: Typically, the Seakeeper 4.5 may be priced higher than the Seakeeper 4, reflecting its increased power and capabilities.

In summary, the choice between the Seakeeper 4 and Seakeeper 4.5 will depend on the size of your vessel, specific stabilization needs, and available installation space.