How to choose the best battery for a solar energy system?

Whether you’re looking for a way to keep the lights on when the grid goes down or you want to help offset demand charges, continued advances in the solar storage industry are making batteries cheaper and more efficient.  While still an expensive option for home energy backup, batteries run on a free energy source and are more environmentally friendly compared to a gasoline generator.

Solar Battery Basics

Before we dive into what battery is best for your solar system, we want to go over a few common battery-related terms.


Capacity is how much electricity your solar battery can store.  Just like your energy loads, capacity is measured in kilowatt-hours (kWh).  The greater the battery’s capacity, the more energy it holds.


Power, on the other hand, is the amount of energy the battery can provide at a single moment and is measured in kilowatts (kW).  These two factors go hand-in-hand when it comes to storing your solar panels’ energy and keeping your loads running.

A battery with high capacity stores a lot of energy, whereas a high-power battery can power equipment that uses a lot of electricity.

Depth of Discharge (DoD)

Depth of Discharge, or DoD, is the percentage of the battery’s charge you use.  For example, say you have a battery with a capacity of 13.5 kWh.  You use 10 kWh of its charge, which is about 74%.  The depth of discharge is 74%.

Battery manufacturers have a recommended maximum DoD for most batteries, meaning they don’t recommend you use 100% of your battery’s power.  Doing so could shorten your battery’s life significantly.  The DoD of batteries vary, but in most cases, batteries with a higher DoD mean you can use a greater percentage of the battery’s power.

Battery Life

If you’ve ever owned the same laptop or smartphone for a few years, you’ve likely noticed the battery doesn’t last as long in year two as it did fresh out of the box.  This is because with each charging and discharging cycle, the battery’s ability to hold a charge decreases.

Most batteries have warranties that will guarantee a battery for a certain number of cycles or a specified time period.  And just as with other solar system equipment like panels and inverters, picking a well-established manufacturer with a long history makes it more likely they’ll be around to honors those warranties.

wall-mounted wholesale OSM battery

48v ground eco

In addition to the wall-mounted battery , there are other top-performing home solar battery backup and storage solutions on the market.

Chinese energy company OSM has long-focused its efforts on the production of solar batteries. Since 2017, OSM has marketed its batteries globally. With their own powerwall factory ,their price is very competitive to their distributors. So their market normally is in powerwall wholesale.

The newest battery storage system of OSM is offered in a variety of sizes, from 5kwh hours to 25kwh. While the most popular and economical size is the 5 kWh model, it’s significantly smaller than other powerwall in dimension.

Some features of the OSM solar battery include:

  • Expandable in series as well parallel.
  • LFP based ESS, long life.
  • Safest battery with modular design.
  • Wide operating temperature range.
  • Flexible control that covers all commercial fields.
  • Wall-mounted installation
  • Zero maintenance.

6 simple reasons to choose wall-mounted battery from China supplier

  • Competitive price

The price is always important, but the quality is the key part of the product. OSM just don’t make the brand premium. Although OSM owns their powerwall factory, they always focus on the qualities ,use the most cost-effective products to conquer their customers and give the most profits to their distributors. A large number of Chinese imports have created a large selection of goods for their customers, powerwall from China supplier, offer more options for customers all around the world.

  • Advanced technology.

    Why choose powerwall from China supplier? They don’t even have any well-known brands, maybe their technology is not mature at all. Indeed, Chinese manufacturers used to be known for providing foundry services to some major companies. People may not have heard of some famous powerwall brands from China. But they have been producing these products for a long time, they are need their own famous brands. OSM is now also moving towards this goal, and at the same time it uses its mature technology to provide OEM for other customers in need.

  • Reduce manufacturing costs

    The cost difference between manufacturing in the US and manufacturing in China is significant. American manufacturers have high management costs, high training costs, and high turnover rates. China’s purchasing power makes overseas manufacturing an ideal choice for ordinary business.

  • Sufficient purchasing chain.

    The cost of purchasing materials and parts of some commodities in China is much lower than in other countries. But this does not mean that Chinese manufacturers need use poorer quality products. Leading Chinese companies are also using some of the same suppliers as European manufacturers to produce main components such as power modules. Therefore, Chinese powerwall supplier has a great advantage in purchasing raw materials.

  • High production capacity

    Chinese factories produce products for the global economy. Their production capacity has far exceeded what people thought possible. When you outsource your business to China, you are working with tried-and-tested factories that have been producing high-quality products in similar industries for many years and and in massive supply.

  • Affordable products

    In China, you can buy high-quality products for very little money. Chinese factories offer discounts for bulk orders; therefore, you saved more money.


AS the powerwall wholesale, OSM ENERGY Focusing on the R&D, Manufacturing and pack production of the world most leading lithium motive batteries. Providing customers turnkey solutions and stable product service during its whole cycle. For more information please contact us:

TEL:+86-0755-2100 2559