About Us

We specialize in off-grid systems for cruising boats. Our team is made up entirely of full time off-grid liveaboards and cruisers based in Boot Key Harbor in Marathon, FL. We rely day in and day out on the same systems we sell and install; from high-efficiency solar arrays, to lithium battery technology, to watermakers. This gives our team unique insight into the needs of self-sufficient cruising boats, their crews,  and the equipment they rely on. Sea Tek marine is about  independence on the water; for boaters, by boaters.

Expert Service


Sea Tek has installed more lithium battery systems and PV solar arrays on boats that any other company in the US. We have the experience to get your project done right, on-time, and on-budget.


We only sell products and equipment that we know our customers can rely on. Most of the equipment we sell is also installed on our own boats. We rely on those systems every day, and you can too.


We don’t offer “one-size-fits-all” solutions.  We’ll work with you to design the system that makes sense for your boat and your budget.

We regularly schedule work on weekends and nights to meet our customers’ needs. We also come to your boat wherever you are. We don’t require our customers to come to the dock for us, we’ll come by water anywhere in the Marathon area.

Need a partner you can trust for your energy project? Just give us a little info and we’ll be happy to schedule a no-cost consultation.

Request Your FREE Consultation


TD and Barbara

s/v La Vie Dansante

From beginning to end, our experience with Seatek was just what you’d want, but seldom get, from technology companies….


Bob Schoen

s/v Helios

As a result of Alex’s expert work and guidance, the quality and comfort of cruising life on my sailboat improved dramatically…