Marine Electric Systems designs and installs LiFePO₄ (lithium iron phosphate) house battery systems for sailing yachts, catamarans, and motor yachts throughout the Chesapeake — Annapolis, Baltimore, and the greater Washington DC area. Every install is a full electrical refit, not just a battery swap: the alternator, inverter/charger, monitoring system, and auxiliary charging are all rebuilt around the new bank so the system actually works the way lithium chemistry needs it to.

What's included in a marine lithium battery install

• LiFePO₄ house bank sized to your boat (typical: 460 Ah to 1,840 Ah at 12V or 24V)
• Brand-agnostic battery selection — Epoch, Battle Born, Victron Lithium, Lithionics, Mastervolt, and others; we specify the right battery for your boat, electrical demands, and budget
• Inverter/charger upgrade — Victron MultiPlus or Quattro, properly sized, programmed for LiFePO₄, and integrated into the network
• External alternator regulation — Arco Zeus or equivalent, with temperature-based charge control
• Isolated DC-DC charging — dedicated chargers for engine start, generator, and bow thruster banks
• Victron Cerbo GX monitoring with Touch display — real-time visibility of every battery and charge source, locally and remotely
• Class-T fuse distribution and proper bus bar architecture — built for the currents lithium banks actually deliver
• ABYC-compliant installation — correct cable sizing, fuse protection, terminal protection, and chafe protection throughout
• As-built documentation — DC and AC system schematics, full system test, and an owner walkthrough at handover

Why upgrade to lithium

Legacy AGM and flooded lead-acid banks limit a cruising boat in three ways: usable capacity is roughly half the rated capacity, recharge slows dramatically above 80% state of charge, and there's no real-time visibility into what each charge source is doing. Marine LiFePO₄ chemistry inverts every one of those constraints. You get nearly the full nameplate capacity, fast charge acceptance throughout the cycle, and — when paired with a proper communications backbone — a system that actually knows what it's doing and tells you about it. For a Chesapeake boat that wants to anchor out longer, run a watermaker, or extend cruising range, lithium is the right answer.

Why every charge source has to be rebuilt

A lithium house bank doesn't drop into an old AGM-era electrical system. Stock alternators with internal regulation will overheat charging into lithium. Legacy inverter/chargers can't be programmed for LiFePO₄ charge profiles. Combiner-based auxiliary charging won't deliver the right charge curve to engine start, generator, or thruster batteries. ACR-based isolation can't handle the currents lithium banks deliver. Doing the install right means rebuilding every charge source on the boat — alternator, inverter/charger, generator integration, DC-DC chargers — and tying them all into one Victron Cerbo GX network so the system works as a coherent whole.

Brands we install

We are brand-agnostic on lithium chemistry. We install Epoch, Battle Born, Victron Lithium, Lithionics, Mastervolt, and other major marine LiFePO₄ brands. The right battery depends on your boat's voltage system, capacity needs, communications protocol (CAN bus, Bluetooth, RS485), physical compartment dimensions, and budget. We'll specify what fits your boat — not what we have on a shelf.

For supporting infrastructure we standardise on Victron Energy (MultiPlus, Quattro, Cerbo GX, Smart Shunt, MPPT solar controllers, DC-DC chargers) and Arco Zeus alternator regulators. They integrate cleanly into a single monitorable system, which is what makes a properly built lithium platform actually useful at sea.

Recent lithium refit projects

Three recent case studies from boats refit by Marine Electric Systems on the Chesapeake:

• Dufour 50 — 920 Ah lithium refit with Victron MultiPlus 3000W and externally regulated alternator
• Beneteau Oceanis 45 — 1,380 Ah lithium refit with Victron Quattro 5000W and Arco 275A high-output alternator
• Leopard 48 catamaran Tortuga — 1,840 Ah lithium refit with dual Victron Quattro 5000W inverter-chargers and 100A autotransformer

Related services

A marine lithium battery refit is rarely just batteries — most projects also involve upgrading the alternator, inverter/charger, shore power, and monitoring at the same time. Related Marine Electric Systems services:

• Marine inverter/charger installation — Victron MultiPlus and Quattro for yachts and catamarans
• High-output marine alternators — externally regulated with Arco Zeus, Balmar, or Wakespeed
• Marine solar array installation — Victron MPPT and custom mounting solutions
• Marine shore power installation — SmartPlug inlets, GFI breakers, galvanic isolators
• Windlass and thruster installation — Lewmar, Maxwell, Side-Power, Vetus
• Marine electronics and navigation — Garmin, Raymarine, Simrad, B&G
• Marine air conditioning — Dometic, Webasto, Mabru variable-speed

Service area

Marine Electric Systems serves cruising sailboats, motor yachts, and catamarans throughout the Chesapeake region: Annapolis, Baltimore, the Eastern Shore, the greater Washington DC area, and the surrounding Maryland and Northern Virginia waterfront. We work at marinas, boatyards, and private docks across the region.

Frequently asked questions

How long does a marine lithium battery refit take?

A full lithium refit — including new house bank, inverter/charger, alternator regulation, DC-DC chargers, monitoring, and documentation — typically takes one to three weeks of yard time, depending on boat size, system complexity, and access. Single-engine monohulls are usually faster than catamarans with two engines and dual-alternator integration.

How long do marine LiFePO₄ batteries last?

Quality marine LiFePO₄ batteries from major brands typically deliver 3,000 to 5,000+ charge cycles at 80% depth of discharge — meaning 10 to 15+ years of cruising service when properly installed and managed. Most major brands offer 10 to 11 year warranties.

Can I keep my existing alternator?

Often yes, with conversion to external regulation and added temperature sensing. Sometimes a higher-output alternator makes more sense — particularly on boats with house banks of 1,000 Ah and up, where a 275 A alternator pays for itself in faster recharge time. We evaluate the existing alternator during scoping.

Do I need to upgrade my inverter/charger when going lithium?

Almost always yes. Most legacy inverter/chargers can't be programmed for LiFePO₄ charge profiles, lack the communications protocols to integrate with a modern monitoring system, and don't have the surge capacity that lithium banks make possible.

Will a lithium refit work with my existing solar?

Yes. We integrate existing solar arrays via a properly sized Victron MPPT solar charge controller, feeding the new lithium bank under Cerbo GX control. If the array is undersized for your new energy budget, we can scope an expansion at the same time.

Get in touch

If you're considering a lithium battery refit on a sailboat, motor yacht, or catamaran in the Annapolis, Baltimore, or Washington DC area, get in touch. We'd be happy to scope the project, walk you through what's involved, and give you an honest assessment of whether a lithium upgrade makes sense for your boat and how you cruise.