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Choosing the Right Battery for Your Solar System

Solar power is on trend as a free and sustainable energy source. You may have already installed a solar system on your roof and are benefiting from it. But merely a solar system isn’t a sure card. What if there’s a long power outage occurring just on rainy days?

Invest in a battery, all is settled.

Why You Need a Battery for Your Solar System

Without an efficient battery, excess solar power is wasted. And you don’t have enough power when the sun isn’t shining.

Storing extra solar energy in batteries, however, allows you to use it later at any time, reducing your dependence on the grid and saving on utility bills. Some batteries support grid connection and allow you to sell the excess energy back to the grid, so you can even earn money from your solar system.

Common Types of Batteries for Solar Systems

Let’s explore some of the mainstream battery types and their features:

Lead-Acid Batteries

Lead-acid batteries have been in use for a long time and are relatively affordable. They offer high surge currents and have a relatively high energy density. Yet, they have a shorter lifespan and require regular maintenance.

Nickel-Cadmium Batteries

Nickel-cadmium batteries are known for their durability and ability to withstand extreme temperatures. They have a long lifespan and high efficiency of charge/discharge. However, they are expensive and contain toxic materials.

Lithium-Ion Batteries

Lithium-ion batteries are widely used in rechargeable electronics and electric vehicles. They are lightweight, require minimal maintenance, and offer high energy density. Two main lithium-ion types, lithium nickel manganese cobalt oxide (NMC) and lithium iron phosphate (LFP), are most popular for solar energy storage.

The NMC batteries are relatively lighter and have a higher energy density. The LFP batteries deliver nearly five times as many charge cycles as NMC batteries and are less prone to catch fire.

Why Choose a LiFePO4 Battery?

Clearly, LiFePO4 batteries stand out as a favorable option for solar systems; they are safer, more stable, and have an impressive lifespan of up to 3.500

cycles, making them a long-term investment for solar system owners.

Some of the Top LiFePO4 Battery Solutions

There are many batteries on the market and BLUETTI emerges as a leading provider of portable, home and commercial battery solutions. In addition to the inherent benefits of LiFePO4 batteries, BLUETTI battery systems offer some outstanding features.

Self-Heating Function

Certain BLUETTI products, such as the B300S additional battery for the AC500, are equipped with temperature sensors that enable self-heating in extremely cold weather. This function ensures the entire system operates smoothly, even in harsh winter conditions with temperatures as low as -20° C (-4° F).

Integrated Power System

BLUETTI battery solutions can be complete power systems that integrate MPPT controllers, efficient inverters, multiple outlets, and more. Coupled with many other useful features, such as the UPS function, peak load shifting, off/on grid connection, BLUETTI battery systems can provide uninterrupted power for all needs.

Wide Compatibility

BLUETTI battery systems are widely compatible with existing or new solar systems. They vary in size, capacity, power and solar charging capability, offering different options.

How to Choose the Right Battery System?

For Residential Solar Systems

Large solar systems on rooftops of homes or farms typically generate more power for large energy consumption and require more capacity for storage. BLUETTI recommends its EP600 and AC500 battery system in these cases. These batteries offer high power output, up to 9.000W and 5.000W respectively. Both are modular in design. You can customize your own battery system by adding batteries as needed.

The EP600 works with 2 to 4 B500 batteries for a flexible capacity ranging from 9.920Wh to 39.680Wh, which can power a home with an average daily energy consumption of 3.000Wh for almost a week. Its grid-connected capability allow you to sell the extra solar power back to the grid for money. Backed by a worry-free ten-year warranty, it constantly benefits you and the earth as well.

The AC500 stores a maximum of 18.432Wh of power when paring with B300S. Compared to the EP600, it is more portable and easier to set up. It doesn’t require any electrical expertise to use, just plug and play.

For Balcony/RV Solar Systems

Balcony and RV solar systems are popular now, they usually have smaller solar arrays for partial independence from the utility. BLUETTI AC200P or AC300 battery systems are just for these setups. These batteries are compact, movable, and provide sufficient power for various occasions.

The modular AC300 has a maximum energy storage of 12.288Wh with the B300 battery and delivers 3.000W power. The AC200P can draw 2.000W from its 2.000Wh built-in battery. What they have in common is a variety of output options that can charge anything you plug in.

In conclusion, selecting the right battery for your solar system is crucial for optimal performance and efficiency. LiFePO4 batteries, such as those offered by BLUETTI, provide outstanding safety, stability, and long-term cost performance. Whether you have a household, or small-scale solar system, BLUETTI offers top-notch battery solutions tailored to your needs.


BLUETTI has been committed to promoting sustainability and green energy solutions since its inception. By offering eco-friendly energy storage solutions for both indoor and outdoor use, BLUETTI aims to provide exceptional experiences for our homes while also contributing to a sustainable future for our planet. This commitment to sustainable energy has helped BLUETTI expand its reach to over 100 countries and gain the trust of millions of customers worldwide.