Different batteries have different advantages and disadvantages, you can decide which off-grid battery to use according to their own needs, the current lithium iron phosphate batteries and nickel cadmium batteries have a wide range of off-grid system, it is recommended that the use of lithium iron phosphate batteries, lithium iron phosphate batteries, compared to nickel cadmium batteries, perhaps he will save you more space and money.
1. On what basis do you go for an off-grid living battery?
(1) Power storage
The fundamental purpose of choosing off-grid batteries is to store more power, so we have to choose the right capacity of the battery, you can estimate the amount of electricity generated by your own PV. For example, on a normal sunny day, a 1.5KW solar panel is accepted for 10 hours, so the amount of electricity it produces is: 1.5 (KW) x 10 (h) = 15KWh, then you have to look for a large enough battery to accommodate them.
(2) Battery and PV panel voltage
The power generated by the PV panels is stored on the batteries through the transmitter, so your batteries must be adapted to your PV in order for the power generated by the PV to be fully captured, to improve the performance, longevity, and stability of the entire system, as well as to avoid damage to the batteries and PV due to excessive loads. Generally speaking, the voltage of the PV panels should be greater than the voltage of the batteries so that the batteries can be charged smoothly. However, in practice, the influence of light, temperature and other factors should be considered.
(3) Depth of discharge
Depth of discharge indicates the percentage of the battery discharge to the rated capacity of the battery, which is generally expressed by DoD. For different batteries the depth of discharge is not the same, but the greater the DoD, does not mean the better the quality of the battery, sometimes deep cycle discharge may be the life of the battery becomes shorter, about how much the depth of discharge in order to help extend the life of the battery, you can learn from the supplier where.
(4) Battery life
Generally speaking, the service life of PV is around 25 years, and choosing a battery with a longer service life is more appropriate for a long off-grid life. Longer-lasting batteries also avoid the costs associated with battery replacement, and good charging and discharging habits will increase the battery’s life.
(5) Maintenance Costs
Some batteries require regular cleaning and inspection, such as lead-acid batteries that require constant replenishment of electrolyte and treatment of oxides on the positive electrode, while some batteries require almost no maintenance and inspection.
2. Different Types of Batteries
There are many kinds of common off-grid batteries, and different batteries can meet different needs
Lead-acid batteries
With a simpler structure and lower cost, they are widely used on a daily basis. Although longer life, but need regular maintenance and cleaning, and larger, very bulky, and the use of electrolyte is dilute sulfuric acid, corrosive, and the need to regularly add distilled water, which contains lead elements if not handled properly, it is very easy to cause harm to the human body, is rarely used in photovoltaic off-grid system.
Lithium iron phosphate battery
Compared with traditional lithium-ion batteries, lithium iron phosphate batteries only use lithium iron phosphate and carbon, does not contain other harmful elements, lithium iron phosphate has a strong stability and safety, and does not require excessive maintenance, long cycle life, high energy density, is a better choice for off-grid batteries.
Gel battery
Gel battery is also a kind of lead-acid battery, but it uses a gel electrolyte, almost no maintenance, compared with ordinary lead-acid batteries, it is safer, and longer cycle life, but it is less energy density, charging time is long, although improved but still very bulky, and higher cost, can not be widely used.
Nickel-cadmium batteries
Nickel-cadmium batteries have a very long service life, but if improper charging and discharging, it is easy to shorten the service life of the battery. It has strong stability, faster charging speed, but it is easy to cause environmental pollution using heavy metal elements, and higher costs.
Summary
Faced with the off-grid situation, you can boldly use lithium iron phosphate battery as a solar cell, its excellent compared to other kinds of solar cells need not be mentioned. There is no doubt that after choosing LiFePO4 battery, you can get a comfortable product experience, which is not available in other batteries.
FAQ
Different batteries have different maintenance methods. Take lithium iron phosphate battery as an example.
First of all, you need to ensure that your equipment is properly connected to the lithium iron phosphate battery.
Secondly, you need to pay attention to observe the rated current and the maximum withstand voltage of the lithium iron phosphate battery, can not be connected to too many devices, resulting in overloaded batteries, which will greatly reduce the performance and service life of the lithium iron phosphate battery.
Finally, lithium iron phosphate batteries need to work in the appropriate conditions to maintain maximum efficiency, while ensuring that the use of the lowest risk, which you need to pay special attention to in the process of use. If you are not sure of the specific conditions of use, you can check the battery’s safe use manual.
Theoretically, different types of solar cells can be mixed under certain conditions, including basic battery parameters such as rated current, specifications and output power. However, this practice is not recommended.
First of all, mixing different types of solar cells increases the cost of installation and maintenance. Secondly, it is difficult to guarantee full compatibility between different types of solar cells. If the different solar cells are not properly designed, it will be difficult to ensure that the whole solar system will work efficiently and stably, and the safety will also be reduced.
