Best Batteries for Solar Power Storage: BLUETTI B230 & B300

bluetti best batteries for solar power storage

Some might argue that without energy storage, a solar system might be of little use. 

And to some degree some of these arguments may reign true, especially to those looking to live off-grid disconnected from the local utility grid. 

In order to understand the importance of solar power storage, one must look to how solar panels work. 

Solar panels are capable of producing electricity thanks to photovoltaic effect. 

However, in order for the photovoltaic effect to take place, sunlight is required. Without it, zero electricity is created. 

(If you are interested in learning more about the photovoltaic effect, we urge you to read this brilliant explanation by Britannica.)

So when we are without sunlight, how can we access electricity? 

One such way is through the use of a solar battery. 

What Is A Solar Battery?

In the simplest terms, a solar battery is a battery designed to store electricity produced by solar panels.

Every solar battery is made up of the following four components:

  • Anode (-)
  • Cathode (+)
  • A porous membrane that separates the electrodes
  • An electrolyte

How Do Solar Batteries Work?

lithium-ion battery chemistry

The nature of the components mentioned above will vary, depending on the type of battery technology you are working with. 

Anodes and cathodes tend to be made of metal and are connected by a wire/plate which is immersed in the electrolyte. 

(An electrolyte is a liquid substance that contains charged particles called ions. 

With oxidation, reduction occurs. 

During discharge, an oxidation reaction causes the anode to generate electrons. 

Due to this oxidation, a reduction reaction is occurring at the other electrode (cathode).

This causes a flow of electrons between the two electrodes. 

Additionally, a solar battery is capable of keeping electrical neutrality thanks to an exchange of ions in the electrolyte.

This is generally what we call the output of the battery. 

During charging, the opposite reaction occurs. Oxidation at the cathode and a reduction at the anode.

Solar Battery Buyer's Guide: What to Look for?

bluetti ac300 & b300 power station

When you are looking to buy a solar battery, you will want to pay attention to some of the following criteria: 

  • Battery type
  • Capacity 
  • LCOE

1. Battery Type

There are various different types of battery technologies out there, some of the more popular are: AGM, Gel, lithium-ion, LiFePO4 etc. The list continues. 

The battery type is determined by the chemistry that makes up the battery. these varying factors affect the performance. 

For example, LiFePO4 batteries have much more life cycles than AGM batteries. Something you may want to consider when choosing which battery to purchase. 

2. Capacity

Not all batteries are made equal, they all come with varying degrees of capacity, which is generally measured in either amp hours (Ah) or watt hours (Wh). 

This is important to consider before purchasing a battery, as any mis judgement here and you may have a battery that is too small for your application. 


The Levelized Cost of Storage (LCOS) is the most appropriate way to compare the cost of different battery technologies. This variable can be expressed in USD/kWh. The LCOS takes into account expenses in conjunction to energy storage over the lifespan of a battery.

Here's an example table below: 

  Lithium-ion 12V, 100Ah Lead-acid 12V, 100Ah
Upfront cost 739.99 USD 174.99 USD
Depth of discharge 80% 50%
Total number of cycles (10 years) – 3600 cycles (2 years) – 700 cycles
Total kWh over lifetime 3’456 kWh 420 kWh
LCOS 0.214 USD/kWh 0.417 USD/kWh

 (Source: Solar Battery Cost, Climatebiz)

As you can see from the example above, at first the lead-acid battery seems like a smart choice due to the much cheaper cost. However, if you consider the LCOS you will find that the lithium battery is in fact 2 times cheaper over the long run. 

Our Pick For Best Batteries for Solar Power Storage: BLUETTI B230 & B300

Taking all the above into consideration, Bluetti has developed their own high performance solar batteries. The B230 and the B300.

B230 Expansion Battery
bluetti b230 expansion battery

  • Capacity: 2,048Wh (51.2V,40Ah)
  • Type: LiFePO4 (Lithium Iron Phosphate)
  • Life Cycles: 3,500+ Cycles to 80% Original Capacity
  • Shelf-life: Recharge to 80% Every 3-6 Months
  • Management System: MPPT Controller, BMS, etc.

Learn more about the BLUETTI B230.

B300 Expansion Batterybluetti b300 expansion battery


  • Capacity: 3,072Wh (51.2V, 60Ah)
  • Type: LiFePO4 (Lithium Iron Phosphate)
  • Life Cycles: 3500+ Cycles to 80% Original Capacity
  • Shelf-life: Recharge to 80% Every 3-6 Months
  • Management System: MPPT Controller, BMS, etc.

Learn more about the BLUETTI B300.

How To Connect The AC200 Max With The B230 & B300


Finally, there are many factors that can affect the quality of a solar energy storage battery. When looking for the best batteries for solar power storage, consider the type of battery, capacity and levelized cost of storage that will make your solar installation perfect. If you have any questions or would like more information about BLUETTI's B230 or B300, please call (+1 702-463-4792) or email [].

The Ultimate Off-Grid Living Solution: Building a 2-Story Shed Home

Written by Gina Wu

Off-grid living is a departure from the typical grid-dependent method of life and relies on sustainable methods, clean energy sources, and rainwate...

Read more

How Much Does a Whole House Generator Cost?

Written by dickson mwanzi

Nothing feels bad like experiencing a blackout. In this 21st century when almost everything is driven by electricity, you would not like it to be i...

Read more

How to Build a Cabin to Start Off-Grid Living?

Written by Gina Wu

As a result, you must deliberate creatively about where and how to obtain the materials, tools, and equipment you'll require to put up your cabin. ...

Read more

How to Build an Off-Grid System 2-Bedroom Tiny House?

Written by Gina Wu

Living off the grid and in a tiny 2-bedroom house gives you more geographic freedom. Whether you're an experienced DIY enthusiast or a total beginn...

Read more