Lithium Batteries for Marine Use

Marine lithium batteries · Boats, yachts, electric and hybrid

A marine lithium battery built to outlast your boat.

TITAN 12V and 24V LiFePO4 for marine house banks, yacht service systems, electric drives and hybrid auxiliary use. Salt-resistant build, custom BMS with active balancing and a built-in heater, lifetime warranty, and a comms package that talks to your Victron / NMEA chartplotter. British Marine member. Designed in the UK, end-pack QC in Cheltenham.

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10x
Cycle life vs lead-acid
3000-5000 cycles to 80% capacity, versus 300-500 cycles for a typical marine AGM bank. Expected lifespan 15-30 years on typical seasonal use.
-50%
Weight versus AGM
A 180Ah TITAN weighs ~21kg. The AGM equivalent is closer to 60kg for the same usable capacity. Big payload back for fuel, water, gear.
CE / R10
Marine compliant
UN ECE R10 E-Mark, UN38.3 transport test, CE and UKCA conformity. Full data on Safety & Compliance.
Active
Cell balancing
Active balancing for normal use, passive top-balance on charge. Cell drift is suppressed below 5mV - rare for batteries that sit on a boat for months.
Why TITAN on the water

Built for boats that live on the water.

Marine is the toughest environment we engineer for. Constant low-level vibration that loosens terminals on lead-acid. Salt spray that finds every exposed surface. Heat, humidity and the kind of dormant winter storage that destroys a lead-acid bank quietly. Plus the duty cycle of a typical house bank - draw, recharge, draw, recharge, all day.

TITAN's response: anti-vibration silicone on every internal contact, conformal-coated BMS board, oversized cell-to-busbar welds and a metal case that doesn't flex under the bilge. The heater pad lets the battery accept a charge in cold storage. It uses the incoming charge current first, and only draws from the pack itself (up to 3.6A) if more energy is needed to bring the cells up to temperature - so when you fire the engine up in March, the house bank charges normally without you having to babysit it.

We're a member of British Marine, the UK trade association for marine industry suppliers. TITAN packs are in use across the country on commercial RIBs, sailing yachts, electric tenders and hybrid superyachts - and on bigger projects worldwide. The Monaco Energy Boat Challenge electric catamaran from DTU runs on a TITAN 180Ah bank.

Sizing your marine bank

How much Ah does your boat want?

Boats use more energy than people expect. A modest 35ft sailing yacht with a fridge, lights, instruments, autopilot, navigation electronics and a chartplotter typically draws 80-120Ah a day at anchor. Add an inverter for the toaster and the kettle and that climbs to 150-180Ah. A liveaboard or a charter boat with watermaker, dive compressor and powered windlass can easily hit 300-400Ah a day.

  • Day sailing, lights, instruments, occasional fridge: 105-150Ah
  • Cruising weekender, fridge running 24/7, fan, kettle: 180-230Ah
  • Liveaboard, full kit, anchor watch: 230-460Ah in a single TITAN, or twin 230Ah in parallel
  • Commercial / charter, watermaker / dive compressor: 460Ah-plus or a 24V bank

Run the battery size calculator with your typical loads and it'll recommend a model.

Plays nice with your kit

Compatible with the gear you already have.

The TITAN comms package is built for marine integration from the start:

  • Victron Cerbo / Ekrano / Color Control GX: full BMS-driven SOC, DVCC charge control, live cell voltages and temperatures. Victron integration guide.
  • NMEA 2000 systems (Garmin, Raymarine, B&G, Furuno): NMEA gateway available, SOC and bank voltage on the chartplotter.
  • Mastervolt / Quick / Bep / Sterling: compatible chargers - profiles on the charger compatibility page.
  • Inverters and inverter/chargers up to 3kW: single 12V TITAN handles it. Above 3kW, twin parallel or a 24V bank.
  • Solar: any MPPT controller with a lithium profile - Victron SmartSolar, Renogy, EPEver - works fine.
  • The TITAN App V2: live monitoring with appliance recognition. Tell it the fridge runs every 20 minutes; it'll flag anything different.
Marine FAQ

Skipper's questions, answered.

Is it safe to install in a bilge?
Yes - TITAN's case is IP-rated and the BMS is conformally coated. As with any battery, it should be securely strapped and out of standing water; our heavy-duty tie-down strap kit is built for exactly this. Don't install in an engine bay where temperatures exceed 60°C continuously.
Will my existing alternator charge it safely?
In most cases, yes - the BMS limits current draw to a safe level for your alternator. For larger banks or for full alternator charge speed, fit a B2B charger (Victron Orion, Sterling BB1240). More detail.
Can I leave it on the boat over winter?
Yes. Charge to around 50-60% SOC, disconnect or set the BMS to storage mode, and walk away. LiFePO4 self-discharge is ~2% per month. A heated TITAN will accept a charge come spring even if temperatures drop well below zero in storage.
Will it work in 24V or 48V configurations?
We offer a 24V 230Ah as a stock product. Two 12V TITANs in series will give you 24V; four in series give 48V - and the BMS supports it. For larger 24V or 48V house banks (commercial, electric drive), contact us for a custom build.
Marine insurance and certification - any issues?
No - TITAN packs carry UN38.3, UN ECE R10, CE and UKCA conformity. Marine insurers we've worked with (Pantaenius, Topsail, GJW) accept TITAN installs without uplift, provided the install meets the usual standards (terminal protection, proper cabling, fuse compliance). Full data on Safety & Compliance.
Do you supply marine OEMs and yards?
Yes - we work with boatyards, fitters and OEMs across the UK and the EU. Trade pricing, installer margin, fleet quantity programmes and custom configurations available. Trade & Wholesale details.
Specify the bank

A house bank that outlives the boat.

From an inland cruiser's day bank to a commercial RIB's parallel-12V or a yacht's 24V house system - TITAN ships the right pack from Cheltenham. UK next-day free, DDP across the EU.

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