Lithium for life aboard.
A house bank lives in a damp, moving locker and gets cycled hard, which is the toughest job you can give a battery. A TITAN is sealed to IP67, anti-vibration mounted on every internal contact, and gives you the full rated capacity without the weight of an equivalent lead-acid bank. From a weekend sailing yacht to a liveaboard motor cruiser or a narrowboat, it is built for the way you actually use a boat.
Why boat owners switch to lithium
A house bank gets discharged deep and recharged often, and lead-acid hates both. Take it below half regularly and it wears out fast, which is why owners end up carrying far more lead than they can actually use. Lithium gives you close to 100% usable capacity, so a single TITAN often replaces two or three lead-acid batteries and saves a serious amount of weight low in the boat.
It also copes with the environment. The casing is sealed to IP67, the cells and connections are anti-vibration mounted in silicone, and the custom BMS protects against the deep discharges, surface charging and temperature swings that come with being afloat. Every pack is opened, retorqued and discharge-tested by hand at our end-pack QC bench in Cheltenham, and carries a lifetime, transferable warranty.
House bank by boat
A starting point by boat type. Your real figure depends on what you run and how long you stay off shore power, so treat this as a guide.
| Your boat | Typical use | House bank |
|---|---|---|
| Day boat, RIB, tender | Electronics, lights, a day out | 80Ah to 120Ah |
| Weekend sailing yachtBavaria, Jeanneau, Beneteau, Hanse, Dufour | Fridge, instruments, lights, charging | 150Ah to 230Ah |
| Motor cruiserPrincess, Sealine, Fairline, Sunseeker, Bayliner | Fridge, inverter, comfort systems | 230Ah to 330Ah |
| Liveaboard or blue-water yacht | Off-grid for days, watermaker, autopilot | 330Ah to 460Ah or a bank |
| NarrowboatCanal cruising and liveaboard | Fridge, pumps, inverter, long off-grid | 280Ah to 460Ah bank |
These are popular pairings, not a fixed rule. Size to your real daily use and how long you stay off shore power, or work it out in the battery size calculator. TITAN packs can be run in parallel to build a larger bank.
Built for the marine environment
Boats punish batteries in ways a van never does, so the build matters:
- Sealed to IP67. The whole casing shrugs off dust and water. The only caveat is the RJ45 comms ports, which drop the rating to IP32 while a cable is plugged in, so route any connected cable to keep standing water away from the port.
- Anti-vibration throughout. Cells and internal connections are mounted in silicone, so constant movement and slamming do not work joints loose over time.
- Reads on your existing kit. The TITAN comms package can be read by a Victron system or over NMEA2000 for monitoring, so the bank shows up on the displays you already have. The package is read-only by design, so third-party kit can see the battery but cannot write to it.
Charging on board
A boat charges from shore power on the pontoon, from solar, and from the engine while you motor. Lithium accepts a high charge current, so it banks real capacity quickly when the engine is running or the sun is out.
For charging from the engine, a DC-DC (battery-to-battery) charger is the safest and best option, and we would fit a Victron Orion every time. It protects the alternator, which matters with the larger house banks common on boats. A split-charge relay does work, but it is not the most reliable way to charge lithium and some relays cause a backfeed that quietly skims around the top 15% off your usable capacity. Running straight off the alternator with no relay and no DC-DC is not something we recommend.
