Boat Battery Notes: 12V and 24V LiFePO4 Packs on Board
A boat's battery system is often split between a starting battery and a house battery, with the house battery serving lighting, navigation, refrigeration and other loads. This article explains 12V and 24V house packs on board in general terms. It is not a product page for a boat model, and it does not recommend a particular pack for a particular boat, because that recommendation needs the boat's system details.
12V or 24V on a boat
The choice between 12V and 24V on a boat depends on the size of the boat and the power of its loads. A smaller boat with modest loads often stays with a 12V system, because its equipment is already designed for 12V and because a 12V system is simpler to maintain. A larger boat with heavier loads - such as a windlass, a bow thruster or larger navigation systems - often moves to a 24V system, because a 24V system delivers the same power at half the current, which means thinner cables and lower losses for the same power. The voltage decision should be made before the capacity decision, because a pack at the wrong voltage cannot serve the system regardless of its capacity.
Nominal voltage is the working voltage used to describe a pack, while charge voltage and cut-off voltage are separate limits. A 12.8 V pack, a 25.6 V pack and a 51.2 V pack belong to different systems and are not interchangeable, even when their capacities look similar. Buyers should confirm the system voltage, the charge voltage and the cut-off voltage for the exact model, and should check that the existing charger or inverter settings match those limits before ordering.
House loads and capacity on board
House capacity on a boat should be calculated from the house loads and their durations, with the added consideration of the boat's charging sources: shore power, alternator, solar and, in some cases, a generator. A boat that spends most of its time in a marina with shore power has different storage needs from a boat that anchors out for days at a time. Refrigeration is often the largest continuous house load on a boat, and it should be estimated carefully, because it runs for long periods and its power draw varies with ambient temperature and with how often the door is opened.
For a business enquiry, the most useful details are the system voltage, the capacity, the expected discharge current, the operating temperature range and the physical space available. A pack that fits on paper can still fail in use if the discharge current, the temperature range or the terminal layout does not match the application. That is why this site asks buyers to confirm specifications per model, rather than selecting from a generic table.
Mounting, protection and weight on board
Mounting and protection are especially important on a boat, because of humidity, salt exposure, vibration and limited space. A protection rating in a listed specification, such as IP55 or IP65 on certain models, describes the pack's housing protection, but it does not by itself make a pack suitable for every marine installation. Buyers should check the mounting position, ventilation, cable entry and terminal access in addition to the rating, and should ensure that the pack is secured against movement in rough conditions. Weight and dimensions also matter, because space is limited and weight affects trim.
A battery management system watches the cells in a pack and disconnects the pack when a limit is crossed. The exact limits depend on the model, so buyers should check the protection list for the model they are considering rather than assuming every pack in a range shares the same list. In the models listed on this site, protection typically covers over-charge, over-discharge, over-current, over-temperature and short circuit, with cell balancing on some models only. Where a model page does not list balancing, it is not claimed for that model.
Charging on board
Charging a boat pack involves the same checks as charging any LiFePO4 pack: the charge voltage for the exact model, the charge current and its maximum, and the charging temperature range. On a boat, charging may happen from shore power, from the main engine's alternator or from solar, and each charging source should be checked against the pack's listed limits. A charging source set for a different chemistry or a different voltage should not be assumed to suit a LiFePO4 pack, because the charge voltage and the cut-off voltage differ by chemistry and by model.
Temperature is a check that is often overlooked when a pack is chosen by capacity alone. The listed temperature ranges on each product page state the charging, discharging and storage ranges for that model, and those ranges should be checked against the installation location and the climate. Charging below the listed charging range should not be attempted without a specific confirmation for the model, because charging in cold conditions can damage the cells. If charging in cold conditions is a regular requirement, the enquiry should state the lowest charging temperature.
What this article does not do
This article does not present a boat-specific model, because no such model is listed with a dedicated specification on this site. It does not recommend a capacity for a particular boat, because that recommendation needs the boat's system voltage, loads, charging sources and available space. It does not state a selling figure, because this site does not list fixed selling figures. Buyers who need a boat pack should start from a listed pack page and check its voltage, capacity, current limits, dimensions and protection rating against the boat's system.
Quotations are confirmed per order. Minimum order quantity and lead time are unavailable on this site, so they are not stated as company policy and must be confirmed per model in the enquiry. This site does not list fixed selling figures, because a figure depends on the model, the quantity and the order terms. A quotation should list the model, the quantity and the specification confirmed for that model, so the buyer and the manufacturer are working from the same description.
Enquiry checklist
Before sending an enquiry, note the voltage, capacity, quantity, application and any required certification document. State whether the pack will be used indoors or outdoors, and whether a display or a particular terminal type is needed. Minimum order quantity and lead time are unavailable on this site and are confirmed per model in the enquiry. Quotations are confirmed per order.
Send an enquiry | Telephone: +86-755-29040095, +86-18576759460 | Email: michael_he@yabopower.com
Frequently asked questions
How do I get a quotation?
Send an enquiry with the voltage, capacity and quantity you need, plus the application. Quotations are confirmed per order, and specifications are confirmed per model before payment. This site does not list fixed selling figures.
What certification documents can you provide?
ISO 9001 is stated by the company. Certificates are available upon request. If a buyer needs a certificate for a specific model, ask for it in the enquiry and name the model, so the correct document can be checked.
Are the specifications on this page valid for every model?
No. Specifications are shown per model and must not be read across the whole range. Where a value is not listed for a model, the page says to confirm per model rather than filling in a generic figure.