Home battery storage systems have skyrocketed in popularity during the past few years for many different reasons. Besides the obvious fact that they provide clean power, more and more people are recognizing that the grid isn't always reliable. 

These systems can be charged by either electricity from your utility or solar power. Grid charging will provide backup power for 10 to 20 hours, depending on usage and the size of the unit. Although you’ll have a finite amount of power, it may be adequate if your outages typically are brief and spotty. However, when coupled with a solar panel system, the battery can recharge for as long as you need it until the grid kicks back on. 

Next, let's take a look at a few Technical Terms.

 

What is an off-grid solar system?

 

An off-grid solar system is a type of solar energy system that is not connected to the grid. This means that the system operates independently and does not depend on the power provided by the grid. Off-grid solar systems are often used in remote areas where it is impractical or cost-effective to connect to the grid, such as remote homes, cabins, and RVs. The system consists of solar panels, a charge controller, a battery, and an inverter that converts the electricity generated by the solar panels into usable power for homes or other applications.

 

 

What is a solar PV system?

 

A "solar photovoltaic system" or solar photovoltaic system, refers to a grid that uses solar energy to provide electricity. In simple terms, it is a power plant that uses only sunlight as its main resource. It mainly consists of solar modules, charge controllers, batteries, and electrical loads.

Therefore, an off-grid solar system refers to a system that operates without the support of traditional utility services. It uses energy from the sun to meet the electricity needs of a house, factory, or facility.

Usually, this type of system can be equipped with batteries or backup generators to provide power at night.

 

How does an off-grid system work?

 

The system generates direct current from the solar panels during the day. The process involves the photovoltaic (PV) effect within the solar panels and the rays from the sun.

When sunlight hits the surface of a solar cell, the electrons become free and are excited. This allows them to act as direct current cables through the solar panels.

Depending on the system settings, DC power can go directly to the inverter, where the power is converted to AC or AC. This will then become the electricity used by the appliance.

Ideally, the load will be powered by solar panels during the day. When the sun goes down, the battery will take over and power the home appliances. The battery system should be large enough to provide power throughout the night. The solar panels will then charge them during the day while powering the load. This is how an off-grid solar power system works.
    

What is Off-grid energy storage?

 

Off-grid energy storage refers to the use of batteries or other energy storage technologies to store electricity generated by an off-grid solar system. This allows excess power to be stored and used when needed, rather than being immediately sent back to the grid. Off-grid energy storage can be used to provide backup power during power outages to eliminate fluctuations in power generation and improve the overall efficiency of the system. There are several different technologies that can be used for off-grid energy storage, including lead-acid batteries, lithium-ion batteries, and flow batteries.

In some cases, the generation of solar energy can exceed the energy consumption of appliances. During this time, the battery system stores any excess or extra power.

When a photovoltaic system is unable to produce the required amount of electricity, the energy stored in the battery provides electricity to the appliances. This happens at night or on cloudy days.

 

Standby generator can be optional

 

It is necessary to cope with low power generation due to adverse weather conditions. In this case, the use of a backup generator may also be considered. It can provide power to the house and, if necessary, charge the battery at the same time.

 

What is the integral kits of an off-grid solar power system?

 

1. Solar Panel
A photovoltaic solar panel is a device that generates electricity by absorbing sunlight and converting it into direct current.

2. Solar Charge Controller
A solar charge controller, also known as a charge regulator, is simply a voltage and current regulator used for battery charging purposes. This means that it controls how the batteries are charged and prevents them from overheating.
The charge controller protects the energy storage system from any damage caused by overvoltage or overcurrent of solar energy.

3. Batteries or Energy Storage Systems
An energy storage system consisting of one or more batteries. Electricity comes from solar energy or other renewable energy sources.
Connecting 2 or more is called a battery pack. The battery pack is usually connected to the other 3 systems. This includes renewable energy sources (i.e., solar panels, wind turbines, etc.), backup generators, and electrical loads (i.e., AC and DC appliances).

4. DC Disconnect Switch
DC disconnect switches are typically placed between solar panels, charge controllers, and batteries. It will stop the flow of current between these devices if necessary, such as during maintenance, upgrades, or repairs to the system. (For Security Maintenance)

5. Off-grid Inverters
Electricity conversion, which supplies power to household appliances.
The input side of the inverter needs to be wired to the charge controller. It requires direct current or direct current.
The output side of a typical off-grid inverter is connected to an AC load or to the main panel of an connected appliance. The inverter converts the direct current provided by the solar panel or battery into alternating current.

6. Standby Generators
In cloudy weather, the off-grid solar system is unable to generate electricity, while backup generators, temporarily provide backup power to run the power load.

 

 

 

Prepare these tools to facilitate the installation of your off-grid solar system:

 

- Cable Crimping Tool

- Cable Cutter

- Cordless Drill

- Screw Drivers

- Power Drill

- Bolt and Nut Driver Tools

- Allen Keys

- Measuring Tape

- Hole Saw Cutter

- AC/DC Multimeter

- Pliers

- Ladders

- Fall-Arrests

- Personal Protective Equipment 

 

 

Here are some Steps to Design an Solar Off-Grid Electrical System:

 

1. Calculate load and power consumption (calculate 1 day's electricity consumption)

2. Select the battery size

3. Select the Solar panel size

4. Select the charge controller

5. Make sure the Cable and circuit breaker size

6. Choose the right mounting structure

 

 

Here are some Steps to build your DIY off-grid solar system:

 

1. Build the installation structure

2. Install the solar panel firmly on the mounting structure.

3. Do a good job of interconnecting solar panels.

4. Securely fix and connect DC cables.

5. Install a solar charge controller or off-grid inverter.

6. Make sure the AC and DC circuit breakers are installed correctly.

7. Install the battery in a safe way.

8. Connect the off-grid inverter to the load.

9. Testing and debugging.

 

OK. Now, enjoying your green, circular and sustainable off grid living!