More and more people are opting for off grid solar power generation, and at the heart of the system is the solar batteries. Deepcycle batteries can provide continuous power, making them ideal for applications that require a quick start-up, of these, lithiumion batteries are a relatively new option in solar energy systems which include lithium iron phosphate, ternary lithium, lithium manganate, lithium polymer battery and etc. The LiFePO4 batteries are the mainstream choice of energy storage and are often used in backup systems and solar battery banks.
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A lithium battery (or lithium-ion battery, Li-ion battery) is a type of battery that is rechargeable for long-lasting usage, utilizing the revertible chemical quality of lithium ions. Featuring high electricity densities, low self-discharge, and many other advantages, lithium batteries are popular choices as a power storage solution for portable consumer digital devices and electronic vehicles. There are various types of lithium ion batteries, for example, lithium polymer batteries, Ternary lithium batteries, and lithium iron phosphate batteries. LiFeP04 is the abbreviation of lithium iron phosphate batteries, which is usually used for solar batteries due to its relatively stable chemical stability.
The work of lithium batteries can be understood as the movement of lithium ions. When we charge a lithium battery, lihium ions will move from the cathode (positive electrode), go through the electrolyte, and reach the anode (negative electrode). During the process, electrons are produced and will be kept inside by the separator. Vice versa, when we discharge the lithium battery, lithium ions will flow from the anode (negative electrode) into the cathode (positive electrode). Another article from the Office of Energy Efficiency & Renewable Energy (EERE) has made the whole process of how a lithium-ion battery works more intelligible.
Image courtesy: Sarah Harman and Charles Joyner, EERE
Let’s assume that you are looking for the answer to how long a lithium battery can work in your RV, electronic vehicle, or yacht, which means we will talk about lithium iron phosphate batteries. Working as power batteries, the average life cycles of LiFeP04 batteries are usually 2000, which means that with one charge-discharge cycle per day, they can last for about eight years. And in a cold area, LiFeP04 batteries in a warm area can last longer.
Lithium battery SOC chart
For charging lithium batteries, you can use solar energy, alternators, shore power or grid power. It is the same thing when it comes to charging a LiFePO4 battery. If you have a solar panel system equipped on your RV or house, lithium iron phosphate batteries can be charged with solar energy, but a charge controller such as the MPPT charge controller is needed. For this type of component, we recommend Rover 100 Amp MPPT Solar Charge Controller from Renogy, which boasts versatile compatibility with solar systems of 1300 watts on 12 volts, 2600 watts on 24 volts, 3900 watts on 36V and 5200 watts on 48V.
Of course, it doesn’t have to use a solar power system to charge a lithium battery, though that can be a cost-saving option. You can also charge it through grid power. Having some electricity stored in a large lithium battery can be a life-saver when a blackout occurs.
But should you leave a lithium battery on charge all the time? Most lithium-ion batteries have built-in over-charge protection, which can cut the charge automatically once it detects a full charge has been reached. Besides, lithium batteries with a battery management system (BMS) also include other forms of protection mechanisms, including over-voltage, overcurrent, over-temperature, overvoltage and short-circuit protection.
A normal battery charger that just has charging modes is not recommended because it will cut in a float voltage at 13.2 volts, which means your lithium battery is only going to be around 80 percent charged as it needs to float at about 13.8 or higher. However, if you have a power supply or a battery charger that you can put into power supply mode, that will be perfect because the built-in BMS in the battery will turn that load off from your power supply when the battery is fully charged so that it won’t get overcharge or undercharge.
You can charge lithium batteries from a charger that may not have a lithium profile. But if it has power supply mode or if you have a power supply in your caravan or something like that, you can use that to charge. It is best to go with a lithium-compatible charger because it still has a couple of sequences that it may add to the charging process, but a single-stage battery charger, i.e., a power supply, also works.
The answer is no. Lithium batteries in series will only have an increased amount of voltage but their amperage will stay. For more details, check our guide to Series And Parallel Connections .
LiFePO4 batteries (or the LFP battery) are a premium storage option that is safe and durable and can be paired with solar energy systems to store excess energy. They are now the storage medium of choice in most solar applications due to their long lifetime, safety,cost-effectiveness, and low maintenance requirements. They are particularly appealing to boat, van, and RV owners.
1. Light and Compact
Energy density is the amount of electricity a battery can hold relative to its physical size. The higher the energy density, the more energy can be stored, whereas lower energy density means less available power and more weight. The lithium ion battery for solar is high density and so can store lots of power while taking up minimal space, which is great when space is at a premium. For example, a 100Ah battery of the same capacity of Renogy, the weight of lithium iron phosphate battery is 40% of that of lead-acid battery.
2. Safety and Stability
LiFePO4 batteries have one key advantage over other batteries: excellent thermal and chemical stability, which translates to improved safety. For example, lithium cobalt oxide and lithium manganate will explode in violent collisions, posing a threat to life; however, lithium iron phosphate has passed strict safety tests, which means that even if an accident occurs, there will be no explosion.
3. BMS
Every LiFePO4battery has a built-in battery management system (BMS) that automatically monitors things like battery temperature, state of charge, and cycle life to maximize battery performance. And if your electricity demand increases, you can expand the system hassle free, by connecting more batteries in parallel, each of which will be managed by its own internal BMS, operating independently and safely.
4. Reliable and Stable Power
Solar lithium batteries can also provide better quality and more constant voltage at any discharge rate. Constant voltage does not fluctuate over time: For example, lights will keep the same brightness throughout each usage period of the battery.
5. Low Self-Discharge Rate
When the lithium ion solar battery is not connected to the load and power supply, the energy may still gradually drop, which is known as self-discharge, or charge retention capacity. The self-discharge rate of lithium solar batteries is very low, generally only reaching 3% per month.
6. Environmentally Friendly
Li-ion batteries have low levels of toxic heavy metals compared to other batteries like lead-acid and nickel-cadmium (NiCd) batteries. Cadmium, lead, and mercury have been major components of batteries for many years, but improper handling and exposure to these metals can harm humans, animals, and plants. Lithiumbatteries for solar are safer than many other kinds, although still do need to be recycled properly: Never dispose of used batteries in general trash!
7. Maintenance-Free
Many types of batteries require a periodic "balancing" process to ensure that all batteries are charged equally. Lithium solar batteries manage their status through BMS, so they don't need to be periodically "balancing".
Compared with other types of batteries, lifepo4 batteries have no special requirements for storage. They don't need to be stored upright or in any vented battery compartment. For long-term storage, it is recommended to charge the battery every six months to avoid low battery power.
8. Memory Effect
The memory effect is an effect of the internal crystallization of the battery due to use, which will temporarily reduce the capacity of the battery and shorten the use time. This usually happens with NiCd batteries, but lithiumion batteries do not suffer from this memory effect, so they always run out of the last bit of charge. Whether using 100% or 25% capacity, you can charge them without tedious maintenance.
When considering solar cell options, you need to compare different lithium batteries based on capacity, depth of discharge (DOD), battery life, and more to find the best battery for your PV system based on your needs.
1. Capacity
Capacity is the total amount of electricity that a solar cell can store. This data is usually measured in watt-hours (Wh) or kilowatt-hours (kWh).
2. Depth of Discharge (DOD)
The depth of discharge (DOD) indicates the battery capacity used. The higher the DOD, the more usage you get from the battery capacity. Most solar batteries come with a recommended DOD to keep the battery healthy. Lithium ion batteries are deepcycle batteries and have up to 100% DOD, meaning you can use more of the energy stored in lithium-ion batteries without recharging as often as you would with other batteries. This also gives them a long service life and capacity is 25-50% higher than similar lead acids.
3. Cycle Life
Cycle life is the number of charge and discharge cycles that a battery can complete before it loses performance. Lithium iron phosphate batteries have more than 2000 cycles, while lead-acid batteries typically only reach between 500 and 1200 cycles. Assuming that one cycle is used each day, then a battery with a cycle life of 2000 retains its performance for five and a half years; a battery that boasts 4000 cycles can be used for more than ten years.
4. Continuous Charging and Discharging Rate
The charge-discharge rate refers to the constant current value output by the battery, when it is charged from an empty state to a fully charged state or discharged from a fully charged state to an empty state, within a specified time. For example, the Renogy 12V 100Ah Smart Lithium Iron Phosphate Battery has a rated capacity of 100Ah and can be discharged for 1 hour at a 100A discharge current, known as 1C discharge. Additionally, the Renogy 12V 100Ah Smart Lithium Iron Phosphate battery with a self-heating function will automatically start running when the battery temperature drops below 41°F (5°C) while charging to ensure excellent battery performance.
5. Battery Life and Warranty
If you've owned a laptop or smartphone for a few years, you've probably noticed that the battery doesn't last as long in the years after that as it did when it first started. As each charge and discharge cycle progresses, the battery's ability to remain charged decreases. Temperature can also affect battery life. High temperatures mean faster reactions, so batteries discharge faster; low temperatures mean batteries have to work harder and charge at higher voltages.
Most batteries come with a warranty that guarantees the battery over a certain number of cycles or for a specified period. Like panels, inverters, or other solar equipment, choosing a well-known manufacturer with a long history is the safest option, as they are more likely to deliver on these promises.
Renogy has been a key player over the last decade as demand for quality renewable energy solutions has been booming. We never stop innovating because we know how much clean energy means. At Renogy, we offer a wide range of solar products, such as solar panels, deep cycle batteries, inverters, solar generators, portable power stations, charge controllers, etc. Join us in creating a truly sustainable future!
The Renogy 12V 100Ah Smart Lithium Iron Phosphate Battery allows for auto-balancing of parallel connections and additional battery connection options. LiFePO4 batteries are protected by an integrated smart battery management system (BMS), which also monitors and manages the charging and draining process. A long cycle life and superior discharge performance are ensured by state-of-the-art battery cells.
Renogy's 12V 100Ah Smart Lithium Iron Phosphate Battery with Self-Heating Function combats the cold by warming itself up when the battery temperature dips below 41°F (5°C) and it’s attached to the input. Long cycle life and superior discharge performance are ensured by the integrated intelligent BMS, state-of-the-art battery cells, and self-heating capability.
A built-in Bluetooth module allows for real-time remote monitoring on mobile devices with the Renogy 12V 100Ah Smart Lithium Iron Phosphate Battery with Bluetooth. It's made with automotive-grade battery cells and has a long cycle life under a variety of loads. The sophisticated BMS ensures that the battery is well-protected. Because it is a standard BCI group size, it is an excellent replacement for deep-cycle lead-acid batteries.
a. Avoid being exposed to extreme temperatures
b. Store the batteries at moderate energy during off-hour
c. Disconnect the battery from your equipment if the battery is not used for a long time.
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LiFePO4 battery is the best you can buy among any deep cycle batteries. However, there are countless options, even among LiFePO4 batteries. These batteries come in different voltages, ampere-hour ratings, features, and many other parameters. Therefore, you need to know how to choose a lifepo4 battery to buy the right one.
This article will provide all the information you need on the subject. You will know about all the factors that play a role in buying decisions. You will also learn about the best places to get these batteries.
What is a LiFePO4 Battery?
LiFePO4 battery stands for Lithium Iron Phosphate batteries. They are named so because the cathode material is LiFePO4. The anode is made of graphite. LiFePO4 batteries are a considerable improvement over conventional lithium-ion batteries. Additionally, their performance is leaps and bounds ahead of lead-acid batteries. These reasons have made LiFePO4 the most popular battery choice in recent years.
Factors to Consider When Buying LiFePO4 Battery
Different users will have different preferences when buying a LiFePO4 battery. Your decision should be based on factors like:
The capacity of a battery represents how many appliances it can power and for how long. It is measured in Watt hours (Wh). The capacity is the primary factor to consider and the main factor that drives up the LiFePO4 battery cost.
Users often get confused when they cannot see a Wh rating mentioned on the battery. Instead, they find voltage and Amp hours (Ah) ratings.
That is alright. You can find the Wh rating by multiplying voltage and amp hours.
Wh = V x Ah
For a 12V battery with a 320 Ah rating, the Wh will be:
Wh = 12 x 320 = 3840 Wh
To find out how much capacity you need, you can add the wattage of all the appliances you use. Then you can multiply it by the hours you want to run them without charging the battery. This will give you the minimum watt hours of the lithium-ion batteries you should buy.
For instance, if you want to run a total of 300W load for 10 hours, you require a minimum of:
Minimum Wh = 300 x 10 = 3000 Wh
Since the load or running time can increase or decrease, the required battery should have more capacity than the minimum Watt hours you require. Therefore, the 3840 Wh battery will be a good fit for the 3000 Wh minimum capacity.
Many users focus on ‘price’ as the deciding factor. However, a better factor to consider should be the value for money of the battery.
Lead acid batteries are the cheaper option in the market today. However, their lifespan is only one-tenth that of a LiFePO4 battery. While LiFePO4 batteries can last over 10 years, a lead acid battery will run out after a year or so. Additionally, there is always the risk of cheaper batteries running out while on the job.
Therefore, opt for value for money instead of the price as the deciding factor. It can save you countless trouble in the long run. This brings us to our next important criterion.
It is essential to consider how many years a battery will last. You can save money and buy lead-acid batteries if you want a short fix for a few months. However, most users do not want that. Instead, they require a long-term solution.
A LiFePO4 battery is the best option in terms of battery life. A good quality LiFePO4 battery will easily last upward of 10 years. AGM and conventional lithium-ion batteries can work well for three to four years.
Cycle life means the number of charge and discharge cycle that your battery can undergo. A longer cycle life means a battery will last longer. Batteries do not come with a suggestive lifespan on the box. However, they do mention a cycle life. Choose an option with a longer cycle life for a better return on investment.
Warranty is a good indicator of the build quality of the battery and its lifespan. Lead acid batteries come with a 6-month warranty. Therefore, they are workable for up to a year until they demand replacement. LiFePO4 battery is a whole different game.
You will find different kinds of warranty periods with different LiFePO4 manufacturers. Eco Tree Lithium is the leader in the game as it provides a warranty of an astonishing 6-year. You can expect the Eco Tree Lithium batteries to easily work for over 10 years with a warranty like that.
Depth of Discharge (DoD) is a significant factor that makes people switch from existing lead acid batteries to lithium iron phosphate batteries. Depth of discharge denotes the usable capacity of the battery.
For instance, the depth of discharge for lead acid batteries is 50%. Therefore, you can use these batteries to 50% of their capacity. After that, they will require charging. However, for Eco Tree Lithium’s LiFePO4 battery, the DoD is a whopping 100%. You can use LiFePO4 through the full rated capacity.
Here is an example for putting things in perspective. Suppose your capacity requirement is 200 Ah. You can meet this requirement with a 200 Ah LiFePO4 battery. However, you will need a 400 Ah battery capacity if opting for a lead acid battery due to its half depth of discharge.
Every battery has a distinct maintenance requirement. Lead acid batteries have many requirements like electrolyte top-ups and venting the buildup gases. Fortunately, maintenance of LiFePO4 battery is much simpler and easy.
Battery dimensions are important for applications like motorhomes. The battery compartments can accommodate a particular size battery bank. LiFePO4 battery has prefixed size groups to denote the standard size of the battery. Match the lithium battery group with your requirement.
Weight is not always on the priority list of important parameters. However, some users find having a lighter battery preferable. If that is the case, any lithium battery is a better buy over a lead acid battery. For instance, a lead acid battery pack of 500 Ah can weigh around 850 kg. The same job can be done by a 250 Ah lithium-ion battery weighing 210 kg. This means a considerable difference in weight.
The main differences come from the eliminated weight of lead plates and electrolytes. Additionally, lithium iron phosphate batteries have lighter electrodes.
Safety becomes essential when you operate your battery near life and property. There have been instances where lead acid battery leak fluids that cause corrosion of the battery and nearby appliances. Conventional lithium batteries have fire and explosion hazards with them. However, lithium iron phosphate batteries are made using very stable compounds of iron and phosphate. These will never explode or cause fire injury.
The voltage of the battery pack is important because it determines its usability. For instance, you cannot replace a 24V battery with a 48V battery and vice versa. Every type of voltage rating has a distinct application, advantage, and disadvantage. If you are replacing your old batteries, you will need to find old voltage rating and match new batteries with the same rating for a constant voltage.
Common voltage ratings are:
All batteries are known for performance stuttering in extreme temperatures. Freezing conditions can lead to battering running flat. These batteries often do not recover once the temperature toll takes place. Therefore, find the optimal temperature range of the battery. Better yet, choose Eco Tree Lithium batteries with an inbuilt heater for cold weather.
Modern batteries come with many features that add to the convenient user experience. Take the case of this battery. It has a Bluetooth feature to check your battery stats remotely. You do not have to open the battery compartment. You don’t have to use a multimeter to check the voltage and current parameters. You can manage the battery remotely from a Bluetooth device.
Other secondary features can include LED indicators for the charging system. Having a handle to transport the battery is also a handy feature to have.
Always choose a LiFePO4 battery that comes with a BMS. A battery management system has a lot of safety protocols against potential hazards. All batteries are prone to irreversible overcharge and over-discharge damage. BMS protection measures cut off the circuit to eliminate any possibility of damage.
Modern energy technologies are pushing towards greener initiatives. It is recommended to choose an environmentally friendly battery option. For instance, cobalt-based batteries (like lithium cobalt oxide) are not environmentally friendly. This is because cobalt is rare and toxic in nature. LiFePO4 battery is one of the greenest battery out there.
Cobalt and lead come in toxic heavy metals category. These materials can cause health hazards if they come into human contact. Therefore, batteries that include these metals are considered unsafe. This includes all lead batteries. However, a lithium iron phosphate battery does not have any toxic substances in them.
Additionally, lead acid chemistry leads to the emission of toxic gases. You might be familiar with the pungent smell that often comes from lead batteries. Therefore, choose a battery that does not have any such risk. You will never need to vent lithium iron batteries because it releases no toxic gases.
Do You Need BMS in a LiFePO4 Battery?
Yes, you should always buy a LiFePO4 battery with a BMS. Lithium iron phosphate battery is a hefty investment. A BMS protects that investment from any harm. BMS will prolong the life of your battery significantly by monitoring every parameter.
Battery management systems come with surge protectors to avoid the harm of excessive currents. Additionally, many other circuits shield the battery from adverse situations. Many BMS also come with displays and relays that monitor data.
Where to Buy a LiFePO4 Battery?
Eco Tree Lithium is the best place to buy a lithium iron phosphate battery. These batteries outperform most batteries on the market. They have features like BMS, Bluetooth, an in-built heater, and a 6-year warranty. Additionally, you get the brand name of the leading LiFePO4 battery supplier globally.
You can easily choose the best battery with the above information. You can also differentiate between LiFePO4 and other lithium-ion batteries. A good battery can be the driving point for a decade of worry-free operation. A lousy option can lead to hazards, breakdowns, and chasing the manufacturer for a replacement. Therefore, spend extra time choosing the battery to avoid wasting your time later.
Frequently Asked Questions (FAQs)
Here are the answers to some common questions regarding LiFePO4 batteries:
No, all LiFePO4 batteries are not the same. The build quality of the batteries differs between manufacturers. These batteries also come in many different types, dimensions, capacity, voltage rating, and features.
Contact us to discuss your requirements of lithium ion batteries for forklift. Our experienced sales team can help you identify the options that best suit your needs.