15kw solar system

15kW solar system

A 15kW solar system is ideal for homes, farms, and small businesses.

An A15kW solar system belongs to the 48V family energy storage series. This high-quality solar system provides reliable power, without any compromise on your lifestyle. Capabilities of this off-grid solar system can power a medium-sized house and larger properties. 

The complete off-grid 15kW solar power system is the most versatile and popular of our off-grid stand-alone solar system products.

15kW Solar System

application scenarios

1: Household electricity for 5-8 people

2: Farms

3: Remote area

4: Emergency standby power

5: Stations 

6: Small Businesses

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It is so compact, it can fit almost anywhere. A small stand-alone solar system, perfect for those difficult-to-power areas.

1: Is a 15kW Solar System Suitable for My Home?

A 15kw solar panel system is best suited for larger homes, or homes with more energy-intense appliances. With the characteristics of safety, long service life, and perfect after-sales service, our products QH Series will be the best choice for your household energy storage meeting your higher power needs.

An on-grid residential energy storage system can also live up to your expectations of recovering the cost quickly because it allows a combination of exporting electricity to the grid and using the power in the home. In this case, you can not only produce the energy you need but sell the rest to have an extra profit.

15kw solar systems produce up to 10-20kw per day in the battery type of lithium iron phosphate. 15kw systems may require 3 parallel batteries due to their ability to export more than 15kw at a time. As a 15kW system can produce more power, it is more expensive than the smaller ones. However, if you have higher energy requirements, it’s often quicker to pay off the cost of installation by installing a system with a larger capacity. 

If you live in a household of more than 10 people, a 15kw solar power system is likely to meet your requirements.

51.2v 300Ah Battery Lifepo4

2: How Many Solar Panels are in a 15kW System?

battery storage system for home

The typical solar panel is 250-400 W, so if you opt for this type of panel, you’ll need to install eight to twelve panels in total to create a 15kW system (15000 W).

Below is a table showing how many panels you would need for a 15kW system, with varying power outputs:

Panel power

Numbers of panels needed









FAQs: 15kw Solar Systems

With an off-grid solar system, you’re completely reliant on the sun and energy stored in batteries to power your home or business.If you decide to install an on-grid solar system, you will always have access to electricity from the utility grid whether or not your solar system is producing energy.

With an off-grid solar system, your solar system is working independently from the power grid and it can continue operating. If you have a grid-tied solar system and the grid goes down, you will not have electricity, unless you opt for a grid-tied solar system with battery backup.

If your system is not tied to a grid, you won’t receive an electric bill. However, off-grid systems are often more expensive because of the additional equipment like batteries needed. If you opt for a grid-tied system, you could still see delivery charges or demand charges on your electricity bill, even if your solar system provides 100% of your electricity.

The below table shows average solar panel of per kW costs of some countries.

CountryCost Per KW
South Africa$1,617 
United States$1,549 


Therefore, the rough cost of 8 kW solar system in Germany should be —$1113*8=$8904.

Likewise, the rough cost of 8 kW solar system in France should be—$1074*8=$8592.

There are four important factors that influence the cost of solar panels.

  • Wholesale equipment costs:As a young industry, factories have been able to automate processes, increase manufacturing and logistics scale and dramatically reduce the cost per watt of a solar installation.
  • compensation: In order to encourage households to select solar energy, government implements intriguing policies to attract citizens to select solar energy, such as The Solar Rebates. The introduction of local solar rebate schemes in particular states has had a dramatic effect on the cost of solar
  • Competition and Cheap Solar: there are thousands of contractors to install solar. As a result, the margins have been forced to be very slim in the market.

This figure depends on where you live, your cost of electricity, your feed-in tariff, and your daily energy usage. To determine how long it would take to pay off a system, you must calculate the total monetary value of the energy produced by the system on an annual basis, and divide the cost of the system by this figure.

You can do this by figuring out what the cost of power is, how much you will export and use in the home, and what your daily savings are.

Like most solar systems, the average life span of a 15kW system is 25 to 30 years. According to the National Renewable Energy Laboratory, solar panels face an average efficiency drop of 0.8% each year. This performance decline is called the solar degradation rate, and it varies among manufacturers. For instance, some solar industry brand may claim a degradation rate as low as 0.3%, while other substandard solar systems could devalue much faster.

What is the solar degradation rate? Simply put, panels become less efficient when producing electricity over time and their solar system output will also decrease. This process is called degradation, and it can take up to 30 years for a high-quality solar system to suffer its effects.

However, despite several decades of use, panels don’t lose their value. Rather, their energy output decreases slightly below the solar company specifications. Light & Elevated Temperature Degradation (LetiD) is the name given to this phenomenon. Better quality panels will last longer and resist this degradation.

Solar panels are incredibly sturdy and are able to last decades with little maintenance. They are designed to withstand strong winds and hail storms, so having your system demolished due to weather conditions is hardly likely. Still, you can ensure more power over the years via the following methods: regularly maintenance; regular dust and debris clearing out.

  • Modular design;
  • Standardized production;
  • Strong commonality;
  • Easy installation, operation and maintenance;
  • Perfect BMS protection and control system for over current, over voltage, insulation and the like;
  • Utilization of lithium iron phosphate cell with low internal resistance and high rate;
  • High consistency of internal resistance, voltage and capacity of single cell;
  • A long  life cycle of around 5,000 times; a service life of more than 10 years;
  • Fast charging and discharging support;
  • Visual LCD display: allows you to set operating parameters, view real-time data and operating status, and accurately diagnose operating faults.
  • Communication protocol: CAN2.0 and RS485, which can be used in various scenarios.

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To accurately design your ideal off-grid solar system and provide you with a quote

What Other Solar Systems Are There?

There are a number of Solar system sizes to choose from including 3kw, 5kw, 6kw, 6.6kw, 8kw, 10kw, 15kw, 20kw, and other solar power generation systems. At the same time, we can also customize suitable photovoltaic luminous systems according to the actual needs of users.

5KW Solar System

10KW Solar System

15KW Solar System

20KW Solar System

How to install a 15 kW System

Most solar companies are capable of installing any size system, but you will want to choose the best solar installer in your area for the job.Many solar companies will offer a free home consultation or evaluation, or at least some sort of free estimate based on the specifics of your home. We recommend getting solar quotes from at least three companies to compare prices. And be sure to ask about any discounts, rebates, or sales the company may be offering.

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