Lithium solar batteries is very common nowadays because they have lots of advantages such as environment-friendly, high efficiency and convenience. There are two main types of lithium solar batteries. This guide will help you to know more about it.
What are solar batteries? What is the function of solar batteries?
A solar battery is an energy storage device connected to a solar system and stores excess energy from solar panels. This energy then uses later when solar panels don’t produce enough electricity during cloudy days or nighttime. Solar batteries are the best source of emergency backup power, and you will be able to enjoy power even if there is a service outage.
How many kinds of solar batteries are there? Which battery is best for solar?
There are four main kinds of solar batteries available in the market.
The best solar battery is a lithium solar batteries. The lithium solar batteries are lightweight and occupy less space. They can be easily put in proper environment and do not emit harmful gases. Lithium solar batteries have fast charging time. They are 100% sustainable and their lifespan is more than 4000 life cycles. At the time of choosing solar batteries, if you are looking for a high-performance installation at suitable prices then lithium solar batteries are the best choice.
Why lithium ion battery is the best for solar?
Yes! the lithium solar batteries is best for a solar system. There are a variety of advantages of lithium solar batteries over lead-acid batteries and other type batteries. Yet, there are some pros and cons of lithium solar batteries. Let’s look at some pros at first .
Long lifespan:
Lifespan is related to the chemistry of the battery. The general lifespan of lithium solar batteries is up to 4000 times, while lead-acid batteries have 2000 times.
High efficiency:
Efficiency means the ratio of energy that get out from the battery relative to the amount put in the battery. The lithium solar batteries have 90-95 % efficiency. It means they lose little energy during the conversion and storing process. Lead-acid batteries have an efficiency round about 75%.
High charge rates:
Lithium solar batteries have faster charging time as compared to others.
High energy density:
Lithium solar batteries have high energy density so that it keeps more energy than lead-acid batteries. It makes lithium solar batteries the best choice for solar equipment.
There are following some cons of lithium solar batteries:
Initial cost:
Lithium solar batteries have a high premium cost than lead-acid batteries. Yet, they are more cost-effective because of their longer lifespan and higher efficiency.
Safety hazards:
Lithium-ion batteries are not resistant to high temperatures, and there is a risk of fire if used incorrectly or if the battery is of poor quality, causing a short circuit and overheating. Battery management system can avoid safety hazards to a certain extent.
Which is the best lithium battery for solar systems?
The most well-known choice for solar system is the lithium iron phosphate battery (LiFePO4). It is significant cost-effective. LiFePO4 solar battery has a high energy density. It has fast charging rate and a longer lifespan of 4000 cycles and the service life can reach 7-8 years and will greatly improve the overall service life of solar photovoltaic power generation equipment.
How to charge lithium solar battery? what to notice?
Solar cells are called solar cells because they are used in solar energy systems for energy storage. Its function is to store excess solar power for use when there is no solar power. Therefore, it is directly charged by the electricity generated by the solar panel. If the lithium solar batteries in your home is a powerwall, if it is connected to the grid, it can be connected to the grid for charging when there is no solar energy on rainy days. For systems equipped with solar, we recommend an MPPT charge controller for charging.
Since the current use during charging depends on the capacity of the battery, so select a charger that matches the capacity of the battery Charging time depends on the charger. Lithium solar batteries have low internal resistance and take less time for charging because it is related to the charging rate. A 500 Ah battery can not use a 100 Ah charger, it depends on the charging current.
Which are the components of a solar energy storage system? How do they connect?
There are many components in solar energy storage systems. Let us look at the essential components:
Solar panels:
A solar panel is the basic component of any solar energy storage system. It allows to charge batteries with solar energy. Monocrystalline, polycrystalline, PERC and Thin film is the most common solar panels. Individual panels can build a large solar array wired together.
Transfer switch:
It is a device that disconnects the power from solar panels when power is out or there is any problem with a solar energy storage system. When the grid power goes down, the priority is solar power generation and then use electricity from the grid. In this process, it transfers switch and disconnects the grid and supplies power directly from the batteries to the load. Similarly, when the grid power revives, it detaches the inverter and enables power to pass via the grid again. Lithium iron phosphate and NMC are the two most common lithium ion batteries, but lithium iron phosphate is the best choice for solar system. Here is a list of top 10 lithium iron phosphate power battery manufacturers in China for your reference.
Storage batteries:
The solar system needs batteries to store solar energy during the daytime and use this energy at night or on cloudy days. The most common and best storage batteries for solar systems are lithium solar batteries. Lithium iron phosphate and NMC are the two most common solar batteries, but lithium iron phosphate is the best choice.
Charge controller:
The battery charge controller regulates a uniform amount of electrical power to the batteries and controls the charging current and voltage within a reasonable range. It also can preserve the batteries from overcharge and discharge.
Inverter:
An inverter is the basic component of a solar system which invert DC power generated by solar panels and stored in batteries to AC power to run home appliances.
MPPT is the most common and effective charge controller technology. It increases a solar array’s effectiveness by 30% which makes it the best technology in all.
These are the basic components required for solar panel system. The solar panels should be set up on the roof or in a position where they face most sunlight all day. A solar energy storage system is incomplete without inverter and storage batteries. Once the battery and inverter are ready at the assigned position, it’s time to start work on the wiring.
First, start wiring with the charge controller. Make 1st connection of the charge controller with the solar panels and the second with the batteries. The last connection is between the charge controller and inverter for supplying the power to the direct DC load connection. It is because:
The advantages of lithium iron phosphate batteries compared with ternary lithium ion batteries in lithium solar batteries.
Green and environmental protection: There are no harmful substances in the whole battery production process, the use process of the battery and the disposal of waste batteries, which will not pollute the environment;
Safe and reliable: Compared with lithium-ion batteries of other materials, lithium iron phosphate batteries have high material safety and are the choice for electric vehicles and solar energy storage batteries;
The discharge voltage of the lithium iron phosphate battery is stable and basically unchanged during the discharge process. It only changes a little when the discharge voltage is about to end, showing good discharge characteristics. The cycle life can reach 4000 times, and it can be used for 7-8 years;
The lithium iron phosphate battery will not leak or be damaged when it is over-discharged to zero voltage storage, and the capacity will not change much. After several charging and discharging cycles, the capacity can be restored to the original state.
How many solar panels does it take to charge a lithium battery?
It depends upon the specifications of solar panels and solar batteries. There are the following data required to calculate the size of solar panels to charge a lithium battery:
Li-battery voltage.
Li-battery amp hours.
Type of solar charge controller.
Desire time for charging in peak sun hours.
Specification of the solar panel
For example, if you want to charge a 12V 100Ah lithium battery in 5 peak sun hours with an MPPT charge controller, you demand around 310 watts of solar panels to charge.
How many lithium solar batteries do I need for the entire house?
To determine the number of lithium solar batteries for power supply to the entire house, there are a few steps to follow:
Energy usage:
The electricity usage is measured in kW-hours in households. This information is shown on your monthly electricity bills. This can vary from country to country, but, on average a household use about 30 kilowatt-hours in a day. The energy demand of the 1-KW hour is equal to the 1 hour of a one-KW device.
Estimate solar panel:
It is important to estimate how many days your solar panels will be without sunlight. You can get this information online by searching the annual average cloudy days in your region.
Specifications of batteries:
Different batteries supply specific power depending on their capacities. For example, a 100 amp-hour 48V LifePO4 Battery can provide around 4.8 kilowatt hours of power.
Number of batteries:
Estimating the number of batteries depends on the electricity demand and power of solar panels. For example, a solar power system is designed to supply 90 kilowatt-hours of energy to an average household. If the battery can store 2.4 kilowatt-hours, you would need 38 batteries.
The using tips of solar battery
There are the following helpful tips to extend the lifespan of your solar batteries:
Use interconnect cables:
For even charging use large battery interconnect cables. It also allows resistance to reduce.
Electrolytes:
Use only distilled water to maintain the level of electrolytes. Adding additives does more harm to the batteries instead of good. This is only to lead acid battery while lithium battery doesn’t need such maintenance.
Things needing attention when charging.
Do not overcharge and overdischarge and avoid full discharge.
How to install the solar battery system?
Step-by-step installation of the solar battery system:
You should have a complete understanding of the wiring system to install a solar battery. Keep in mind that never connect a solar panel directly to a battery. Always connect the battery and solar with the solar charge controller. For safety practice, place one fuse between the positive terminal of the battery and the charge controller and the other between the positive terminal of the solar panel and the charge controller.
Make the large battery interconnecting cables.
Connect the battery to the solar charge controller with help of battery cables. Carefully connect the negative battery cable to the -ve battery terminal and the positive battery cable to the +ve battery terminal on the charge controller. Keep on the charge controller for signs of proper battery connection.
In this step connect the solar panels with the charge controller. For this connection, you need a waterproof DC PV plug socket MC4 solar cable connector. The -ve solar cable connects to the charge controller before the +ve solar cable. Keep the charge controller turned on for signs of proper connection.
Put the solar panels in the sunlight in a suitable position and your charge controller will show that the battery is charging.
How can we maintain solar batteries?
There are the following tips to maintain solar batteries:
Never drain your lithium solar batteries bank completely. It may reduce the capacity and lifespan of solar batteries.
Solar batteries work ideally at 20-25℃. So, protect them from extreme temperatures which can affect the performance of solar batteries.
Check your solar batteries at least once each month for any potential problems.
Properly charging your lithium solar batteries is one of the best points in maintenance.
Always use distilled water to maintain the level of electrolytes.
Check the appearance of solar cells for damage.
How much does a lithium solar battery cost?
The exact amount for a lithium solar batteries depends upon the brand, its size, specification and materials. A regular solar battery costs from 2000-5000 $.
How to choose the best lithium solar battery manufacturers?
The best lithium solar batteries manufacturers will help good power storage to your solar system. It will bring you convenience and high-efficiency lithium solar batteries. In this way, TYCORUN Energy is your best choice for a lithium solar batteries manufacturer. It is an odm lithium ion battery pack manufacturer and It is a professional and advanced lithium solar batteries manufacturer, and it also cooperates with lots of B end customers around the world. TYCORUN Energy provides many solutions to other battery factories and suppliers, and it has an important status on lithium solar batteries.
How long will a 10kw solar battery power my house?
Various batteries supply specific power according to their capacities. A 10 KWh lithium solar batteries will power your house for 10 to 12 hours for the average home marking 750 to 1,000 W of power per hour.
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First, start wiring with the charge controller. Make 1st connection of the charge controller with the solar panels and the second with the batteries. The last connection is between the charge controller and inverter for supplying the power to the direct DC load connection. It is because:
The advantages of lithium iron phosphate batteries compared with ternary lithium ion batteries in lithium solar batteries.
