Whether you're looking for a way to keep your home power in case of grid failure, such as heating and lighting, or to offset the demand for electricity, the continued development of the solar storage industry has made batteries cheaper and more efficient. Although it is still an expensive option for home energy backup, the battery uses free energy and is more environmentally friendly than a gasoline generator.

 

BASIC KNOWLEDGE OF SOLAR BATTERY

Before we look at the most suitable battery for your solar system, we should learn some common terms related to batteries.

 

Capacity

Capacity is the amount of electricity that a solar cell can store. Similar to your home reservoir, the capacity is in kilowatt hours (KWH). The larger the capacity of the battery, the more energy it can hold.

 

Power

Power is the energy that the battery can provide at one time, in kilowatts (kw). These two factors are closely linked when storing the energy of the solar panel and keeping the load running.

High capacity batteries can store a lot of energy, while high-power batteries can power devices that consume a lot of energy at the same time.

 

Discharge depth (DoD)

The depth of discharge or DOD is the percentage of battery power used. For example, suppose your battery capacity is 13.5 kwh. About 74% of the 10 kwh you use. The discharge depth is 74%.

Most battery manufacturers in the industry set the maximum DOD for the battery, which means they don't recommend you use 100% of the battery capacity. Because doing this thing may greatly shorten the battery life. Each battery has a different DOD, but in most cases, a battery with a higher DOD means you can use a larger percentage of the battery.

 

Battery life

If you have had the same laptop or smartphone for a few years, you may have noticed that the battery life in the second year is not as good as when it was out of the box in the first year. This is because with each charging and discharging cycle, the ability of the battery to maintain charge decreases.

Most batteries have a warranty that guarantees a certain number of cycles or a specified period of time. Like other solar system equipment (such as panels and inverters), choosing a manufacturer with quality assurance and good after-sales service is more likely to fulfill these guarantees.

 

THE BETTER SOLAR BATTERY TYPE


Lead acid battery

Lead acid batteries have been commercially used for more than 100 years and have been used in off grid solar systems for decades.

There are several different types of lead-acid batteries, including wet or submerged lead-acid batteries, gel batteries, absorbent glass mats or AGM batteries. For decades, wet battery deep cycle battery has been a necessary choice for off grid system, which can provide relatively low-cost reliable storage.

However, the use of lead-acid batteries requires regular replenishment of water to prevent electrolyte evaporation during charging. Although gel and AGM do not require this additional maintenance, they are usually more expensive and have shorter battery life.

For all types of lead-acid batteries, their popularity depends in part on the ratio of watt hour capacity to cost. However, as one of the cheapest alternatives for backup batteries, they also have shorter life and much lower DOD (about 50-60%) than lithium-ion batteries.

The battery life is relatively low and you may find yourself replacing it every 2-3 years. If you don't care and don't use the battery properly, the time will be shorter. In addition, lead-acid batteries are often heavy and large. If they are overcharged, they will produce harmful gases, pollute the environment and may harm your health.

Another thing to note is that they need to be used, maintained and ventilated regularly. If you can't use and maintain the battery regularly, be sure to keep this in mind.

Lead acid batteries are an economical and proven solar energy storage method, but their DOD is low and need regular maintenance, which may make them become impractical backup systems for grid connected households or enterprises.

 

Lithium ion battery

Lithium ion batteries have grown into the most popular solar storage method, and with the continuous development and improvement of electric vehicle companies such as Tesla, lithium-ion batteries are rapidly improving and becoming cheaper and cheaper.

As a smaller, more durable option, lithium-ion batteries are the perfect choice for solar backup, but they are more expensive than lead-acid batteries.

Lithium ion batteries have higher DOD (about 80% - 90%) than lead-acid batteries, which means you can use more battery charge to power the load. They also have longer battery life, about 6-8 years, which means they have a longer life than lead-acid batteries, it means the average cost of lithium batteries is much lower than that of lead-acid batteries over the same period of time.

If you want to power equipment that uses a lot of power, such as heavy electrical equipment, lithium-ion batteries tend to be better than low-power lead-acid batteries.

We specialize in the production of lithium iron phosphate lithium-ion batteries, which do not produce toxic gases like lead-acid batteries, nor do they have the risk of fire like lithium-ion ternary batteries. They also require little maintenance, and their lightweight fuselage means they are easy to install. They LFP batteries are ideal for your home's solar power system.

 

Battery Type

Capacity &Power

Life

Maintenance

Cost

Safety

Lead-Acid

Small

Short

Requires frequent maintenance

$

Can emit harmful gases if not handld correctly

Lithium-lon

Largest

Long

Little/no maintenance

$$$

Low chance of fire

LiFePO4 Battery

Larger

Largest

Little/no maintenance

$$

No gas or fire