A larger and more efficient battery bank is a fantastic upgrade to any boat, and with today’s technology, a lithium battery system offers that. Lithium-based batteries are becoming more prevalent in almost every facet of life, so the technology and chemical compounds are changing quickly. The current standard for marine lithium batteries is a Lithium Iron Phosphate (LiFePO4) battery. Compared to the older cobalt-based lithium-ion batteries, the new generation is safer, more efficient, and has a longer lifespan.
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The other key piece of technology that has increased lithium safety and reliability is a Battery Management System or BMS. A BMS monitors each cell of the battery for temperature and voltage. It also offers the ability to disconnect batteries and cells from the rest of the electrical system in the boat These units are often made by the same manufacturer as the rest of the charging system, so they connect and share data with the charger.
A discussion of a lithium battery system often includes insurance and what effects the new batteries would have on coverage. With lithium installations becoming more common in the marine setting, the ABYC has created a standard that all systems should follow. Just like any major electrical work, all lithium projects should be handled by an ABYC-certified shop. They have named the guidelines around lithium batteries E-13. Mike Hobson, of PKYS, did a more in-depth dive into insurance and lithium on his blog
By greatly expanding the capacity of the batteries, a lithium system also opens the doors to some pretty cool features. Imagine a full night’s use of air conditioning running in complete silence. Another option could be to have your SeaKeeper running all day while out on anchor and without the generator running or even installed.
Currently, the rough cost of a lithium-ion battery bank and all of the associated systems runs around $15k for a boat in the 30-foot range. Across all markets in the US, the cost of lithium-ion batteries per kilowatt-hour has been on a steep decline for the past 10 years. Dropping by around $640 per kilowatt-hour. This looks rather favorable when compared to the $20-22k that a generator install would cost and I would expect battery prices to keep getting more competitively priced. The lithium setup also reduces the weight of the boat when compared to a generator. Not only are you removing the weight of the generator itself, it is also the fuel lines and other associated systems that are no longer needed. In the North Point shop, we have been able to add SeaKeepers to smaller boats by converting to lithium-ion and not having a generator in the way.
The other major boat system that conventionally requires a generator is air conditioning, but lithium can change that. The most efficient way to achieve this is with a DC powered air conditioner backed by lithium batteries. Most A/C units run on AC power, so either a generator or inverter would be needed. The newest generation of DC powered A/C units allows battery power to be utilized much more efficiently. In the real world, I have found that the DC units are slightly less powerful compared to the AC unit. For example, a 40-foot sailboat that would normally only need one AC unit might need two DC units. They also tend to cool a little slower. This can be overcome by keeping the boat sitting at a cool temperature most of the time. This avoids the need for an aggressive fast cool down and means the A/C unit just needs to maintain temperature. We did an installation on a 30-foot powerboat and predicted 8 hours of A/C run time on battery power. The idea was to provide a full night’s sleep with A/C running while out on anchor.
Even if you aren’t quite ready to swap your boat over from conventional batteries, the market is pointed in that direction. I would ensure that any battery charger or similar device installed on any of my client’s boats moving forward would be lithium-ready.
Victron has been producing some really great products for marine applications that are very compatible with lithium. They also offer a fantastic user interface that provides easy to understand battery data. Victron offers a complete lithium system including batteries with a built-in BMS, this allows for a very clean installation.
Marine lithium battery are designed typically for use on a boat.
There are three basic types of marine batteries:
Marine starting batteries have big CCA(Cold Cranking Ampere), which are always provide quick but powerful energy over short periods of time and are designed to start the engine. A starting battery should not be used for trolling motors or powering appliances.
The marine deep cycle batteries have big CCA(Cold Cranking Ampere), which are designed to discharge slowly over a long period of time and to withstand several hundred charging and discharging cycles. A deep cycle battery is the right choice for powering an electric trolling motor and other battery-powered accessories such as a windlass, fish locators, depth finders, audio systems, and applicances. Deep cycle batteries should not be substituted for starting batteries.
Combine the advantages of starting and deep cycle battery, the dual-purpose batteries can be used for starting purpose and power the applicances purpose.
The electrodes (lithium and carbon) commonly used in lithium-ion batteries are inherently light. Making them smaller and lighter than older batteries such as lead-acid batteries. For comparison, a typical 100Ah (= amp hour) Li-Ion battery weighs about the same as a 40Ah lead-acid battery (about 10-12kg). But has more than twice the capacity.
Maximize your energy potential with 100% Depth of Discharge. This means that you can use 100% of the battery’s capacity to power your specific needs. Lead-acid/ AGM batteries slowly decrease their power and performance while the charge depletes.
Lithium has the ability to release and store large amounts of energy. Enabling lithium-ion batteries to package high energy capacity in a small size. This means that a lithium-ion battery of the same weight will last much longer between charges than other rechargeable batteries. While still maintaining its high level of performance.
Older rechargeable battery types, such as nickel-cadmium or nickel-metal hydride batteries, have what’s called the “memory effect” or “inert cell effect”. If repeatedly partially discharged before charging, the final battery can only supply locally before the voltage drops. Energy used during discharge. To avoid this, NiCd and NiMH batteries need to be fully discharged and recharged on a regular basis for maintenance.
Lithium-ion batteries don’t suffer from memory effect, which means they always use up the last bit of charge. Whether you’re using 100% or 25% capacity, you can charge them without tedious maintenance!
High-quality ternary lithium-ion batteries last for about full charge cycles, and lithium iron phosphate batteries last for about full charge cycles. A full charge cycle is when the battery is discharged to depletion and then charged to full, so using the battery until it reaches 75% capacity and then plugging it in to charge does not constitute a full charge cycle. When your battery is recharged, you can still use 75% of the charge remaining before charging; only then can your battery complete a full charge cycle.
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Lithium-ion batteries also have relatively low self-discharge rates. Self-discharge is a natural, irreversible phenomenon for batteries, where chemical reactions inside the battery reduce the capacity of the battery, even when the battery is not being used. The self-discharge rate of Li-ion batteries peaks at around 3% in the first 24 hours after charging, and then gradually decreases to 1-2% per month. In comparison, nickel-based rechargeable batteries lose about 10-15% of their capacity after charging, and another 10-15% per month.
The electrodes (lithium and carbon) commonly used in lithium-ion batteries are inherently light. Making them smaller and lighter than older batteries such as lead-acid batteries. For comparison, a typical 100Ah (= amp hour) Li-Ion battery weighs about the same as a 40Ah lead-acid battery (about 10-12kg). But has more than twice the capacity.
Marine lithium batteries usually last for 4,000 times cycles. This usually translates to lithium batteries lasting ten years or longer. While lead acid batteries only last 1,000 to 1,500 times cycles. Conversely, most lead-acid manufacturers offer warranties between one and five years.
Also the marine lithium batteries are lower maintenance than lead acid batteries. Lead acid marine batteries need to be kept topped up with water to protect the lead plates inside them. And they will become damaged if they are allowed to get too hot or too cold. However, the lithium battery are sealed and maintenance free.
The answer is yes, lithium batteries are safe for marine and boat applications. Lithium batteries are sealed, which means that moisture and even a bit of water splashing on them will not cause harm.
Additionally, We ELB lithium batteries are built in an internal battery management system (BMS). The BMS will detect battery real-time conditions. And shut down the battery to prevent damage or thermal runaway.
ELB marine lithium batteries usually cost around $300usd for a 12V 100 Ah capacity battery. The upfront cost is significantly more expensive than the lead-acid counterparts available, but the overall long-term cost is lower.
The lithium battery can last 4,000times, the cost per cycle is $300usd/times=$0.075usd per cycle.
however, the lead acid battery can last 8,00times around, the cost per cycle is $150usd/800times=$0.18usd per cycle.
Also we all know, the benefits of significant weight reduction, increased efficiency, added safety, and a much longer lifespan.
When you factor everything in, not only are lithium marine batteries actually cheaper in the long run, they’re absolutely worth the investment.
But if you only use your boat 10-20 times a year. Or you just run lights and navigation equipment, then lead-acid still probably wins by being more cost effective.
But buy the best you can find, with a gel type top of the list. Keep it well charged up and with sensible use it will last 5 years.
But once you start going out more often, or running an inverter. Then lithium battery becomes worth installing. the lithium battery can run 4,000times as I mentioned above.
ELB batteries are designed to suit your specific power needs, so you can link multiple batteries together in series or parallel (or both!).
When you connect batteries in series(negative to positive), the voltage will increase while the amp hours remain the same (4 x 12V 100Ah batteries = 48V 100Ah total).
When you connect batteries in parallel (negative to negative and positive to positive), the amp hours will increase while the voltage remains the same (4 x 12V 100Ah batteries = 12V 400Ah total).
About the battery charging technology, please visit our article《Lithium Battery Charging: The Definitive Guide》
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