(Last Updated On: 10/11/2022)

Can-I-Add-A-Battery-to-the-Existing-Solar-Power-System

Can I Add A Battery to the Existing Solar Power System?

The answer is yes! Retrofit the existing solar power system becomes important as the extreme climate is more frequent than usual, drawing energy stored in battery instead of grid would be much more cost-saving. In particular it’s an oblivious advantage in Europe due to the influence of the Russian-Ukrainian war, European countries are short of energy and energy prices continue to rise. 

Overview

1. What should I know before considering adding the battery to my existing solar power system?


2. What you can benefit from adding a battery to a solar power system?


3. How Solar Energy Is Stored in a Battery?


4. The two connection methods of adding a battery to the solar power system.


5. How to choose the right size solar battery storage system for your home?


6. Can Solar Battery Storage Take You Off-Grid?


7. How Long Can Solar Batteries Last During Outages?


8. How many solar batteries are needed to power my house?

1. What should I know before considering adding the battery to my existing solar power system?

The Existing Solar Inverter
A solar inverter is a critical part of any solar energy system. It is responsible for converting DC solar power created by PV Panels into AC solar power, which can then be used to run appliances and lights in your home.

Another one is hybrid solar inverter which can merge solar power and battery power as a single unit. It’s a mix of solar inverter and battery inverter into one device. This feature helps to easily control the power from solar panels, solar cells and utility grid at the same time.

Hybrid solar inverter can store excess DC power in the battery and convert it into AC power when needed to power your home.
Nowadays it is become the most commonly used option for householders.

Therefore, if your existing solar inverter is traditionally one, you’ll need to install an extra battery inverter to work with your existing one together. Or you can install a hybrid solar inverter to replace your existing one.

Your Existing Solar Power System Size
Solar battery storage is not recommended if you have a small solar power system that generates sufficient power to match your consumption of electricity.

In contrast, if your solar power system generates more energy than you need, you should go for additional batteries. With batteries, you will be able to use more of the power generated by solar panels. Adding a battery for solar energy storage eliminates your dependence on the grid, especially during the night or when the solar system does not work. Prior to purchasing battery storage for solar energy, it is important to understand why you are planning to purchase a battery. Your goal may be to become independent from the grid or to save as much as possible on your electricity bill. Depending on your needs, you may need to purchase batteries or a hybrid inverter. Or you can consult Bonnen expert before the decision.

2. What you can benefit from adding a battery to a solar power system?

Solar batteries are a great way to store excess electricity from solar panels. They can also provide other benefits such as higher energy savings, lower costs for power bills, and even entering into free off-grid mode if you add a large-size battery system!

3. How Solar Energy Is Stored in a Battery?

Solar batteries are an essential part of solar energy systems. Without them, solar panels would only be able to generate electricity when the sun is shining. But with solar batteries, solar panels can continue to generate electricity even when the sun isn’t shining. Solar batteries work by storing solar energy in a chemical form that can be released later as electricity. There are different types of solar batteries, but they all work according to the same basic principle. The solar panels convert sunlight into electrical energy, which is then stored in the batteries. When the sun goes down or when there is a power outage, the batteries discharge their stored solar energy as electricity, providing power for homes and businesses. Solar batteries are an essential component of solar energy systems, and they are becoming increasingly commonplace as solar energy becomes more popular.

4. The two connection methods of adding a battery to the solar power system.

DC Coupled System

In a DC coupled system, you’ll need hybrid inverters to replace the traditional solar inverters.

The DC power generated by solar panels would go to the hybrid inverter, it can either charge the battery or converts to AC supplying home appliance and grid-tied.

DC-diagram

AC Coupled System
In an AC coupled system, you can reserve your traditional solar inverter, but you’ll add a second battery inverter (charge the battery) to the system.

DC power generated by solar panels goes to the inverter and is converted to AC power as it always has. From there, the AC power can either be for your loading or go to the second inverter to charge the battery. So AC coupling can offer flexibility to the retrofit location.
AC-Coupled

5. How to choose the right size solar battery storage system for your home?

There are a few factors to consider when making your decision. First, you’ll need to determine how much power you’ll need to store. This will depend on your solar panel setup, how much power you use on a daily basis, and what you want to use the solar batteries for (backup power or self-sufficiency). If you just adding a battery to existing solar system, it’s important to know our solar array capacity and efficiency. If you’re not sure, please contact the Bonnen team before the deployment plan.

6. Can Solar Battery Storage Take You Off-Grid?

Living off-grid means generating and storing all of the energy that your household needs.
By theory as long as the solar arrays and battery size is big enough, you could completely go off-grid. Home batteries store your energy, so you can use it whenever you need it. But we need to consider the total investment and payback period,
most solar power storage systems aren’t designed to completely cut off a homeowner’s connection to the grid, partial off-grid may become more reality in the current home battery cost stage.

7. How Long Can Solar Batteries Last During Outages?

This is related to your whole solar battery storage size, your necessary electricity consumption status, how much power is stored in your battery, the weather condition etc. Before the installation, your solar installer should provide a tailor-made solution for you that normally enable it to last several days during outages.

8. How many solar batteries are needed to power my house?

This is depending on a variety of factors, including the size of your home, the number of appliances you have, and the amount of sunlight your location receives. Typically, we recommend a household add at least a 10-15KWH battery basis with a 5KW inverter to power your critical appliance. As is apple to apple, just call the Bonnen team to provide you with professional advice

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