Marine Electrical & Battery Systems in Sandwich, MA

The most common electrical problem we see at Atlantic is boats with a single starting battery that is also running electronics, bilge pumps, lights, and audio. That single battery gets discharged while the boat is anchored and then struggles to start the engine at the end of the day. A properly wired dual-battery system with an automatic charging relay or battery management switch solves this entirely: one battery for starting, one battery for house loads, and an isolator that keeps them from dragging each other down.

Lithium batteries (LiFePO4) have become a realistic upgrade for many boats in the last several years. The price has come down considerably, and the advantages are significant: lithium batteries are roughly half the weight of equivalent AGM batteries, they hold their voltage much flatter under load, and they can be discharged to a much lower state of charge without damage. On a boat where every pound matters or where you are running significant electronics loads, lithium is worth considering. We will give you an honest comparison of cost versus benefit for your specific use case before you commit.

Shore power systems are the other common electrical upgrade on trailered and slip-kept boats that spend time at the dock. A proper shore power inlet with a galvanic isolator, correct wiring, and a battery charger sized for your bank means the boat is fully charged and ready when you arrive, without the risk of galvanic corrosion from stray dock current.

We also handle general marine electrical troubleshooting: parasitic draws that kill batteries overnight, corroded connections that cause intermittent problems, undersized wire runs that create voltage drop, and wiring that was added without proper fusing. Marine electrical problems are often incremental: one bad connection causes a problem, someone adds a wire to work around it, and over time the system becomes unreliable and difficult to trace. We will go through the whole system if needed and document what we find.