The purpose of all solar panel systems is to provide a clean and green source of energy for everyone. With time three types of solar systems have been introduced in the market, which contributes to around 4.5% of global electricity. This article is dedicated to all aspects related to on grid vs off grid vs hybrid solar, and with this you will know which is a better choice.
On Grid Vs Off Grid Vs Hybrid Solar
An on grid system is connected to the utility grid, off grid is independent of the grid and backed up by batteries, whereas a hybrid is a combination of both.
Hybrid has both grid connections and batteries. If we compare these 3, it is the costliest of them all as it has more components.
To know them better, let us compare all three systems:
Parameters | On Grid | Off Grid | Hybrid |
Battery Storage and Backup | No | Yes | Yes |
Grid connectivity | Yes | No | Yes |
During power outages | Does not work | Works | Works |
Power Appliances during Night | Depends on grid | Relies on battery storage | Uses both battery backup and grid |
What to do with extra energy | excess power sent back to grid | Wasted (if the battery is charged) | excess power sent back to grid |
Price | Low | High | High (costliest) |
Unit adjustment (in electricity bill) | Yes | No | Yes |
Now, let us take a look at their pros and cons.
On-Grid System
Electricity generation takes place only when the solar system is connected to the utility grid. Also known as a grid-tied or grid-connected system, in this system direct current (DC) received from panels enters the solar inverter which converts it into alternating current (AC).
In this system, power generated during the day is fed into the grid which is utilized by the system at night. The house gets electricity supply from the utility grid in case the solar system does not produce enough power during the day.
Grid-connected systems are suitable for commercial, industrial, and residential uses where the grid connection is available. The primary components required are net meters, utility grids, inverters, solar arrays, wires, and charge controllers.
Pros
- With no batteries required, on grid system is more cost-effective than other systems. This increases the value of your house.
- Reduction in electricity bill and you can save extra with government incentives
- No emission of greenhouse gases during electricity generation by PV modules
- Easy to maintain and easily synchronize with other power resources
Cons
- Completely dependent on the grid for operation. The system will not supply electricity during power outages.
- Without batteries, the initial cost is reduced to some extent but with inverters, the upfront costs are still high.
- Not suitable for all houses, especially in rural areas, as there is no regular power supply from the grid.
- Regular maintenance is necessary to maintain its efficiency and output.
Also Read: Solar Panels Not Reducing Bill: Common Issues and Solutions
Off-Grid System
Also known as a standalone system, this is completely independent of grid connectivity and backed up by batteries. Power generated by solar panels is stored in batteries and used to run devices simultaneously during the day. At night when there is no power generation, stored power from batteries is used up.
It is suitable for remote-rural areas, industrial properties, and agricultural lands. Inverters, batteries, solar panels, controllers, voltage switches, are required for the system.
Pros
- Complete independence from grid and power outages
- With a stand-alone system, your input in carbon footprint becomes zero.
- Paired with batteries providing a 24*7 solution to power problems.
- Due to poor infrastructure in remote areas, the electricity supply is often an issue there. With off-grid solar systems, you can depend on solar panels for continuous power supply.
Cons
- With bigger batteries and efficient solar panels, there is more than enough power output that often goes wasted.
- Batteries paired with solar systems have a limited power capacity. And when they get exhausted there is not any other backup.
- Solar inverters account for 30% or more of the cost of a solar panel system but when paired with batteries the system gets even more expensive.
- It is problematic in cases when there is less or no solar power generation on cloudy days or during winter.
One major difference between on grid and off grid solar is that the former is more economical whereas the latter is expensive and has 24*7 battery backup. Also, compare their costs for a 20kW system.
Hybrid System
It is a combination of both on and off-grid solar systems as it is connected to the grid and has a battery backup too. The solar inverter works as an on-grid inverter when there is a power supply from the grid. Excess power generated after powering the devices is fed into the grid and battery. This stored power from the battery is used in case of a power outage at night.
This system is ideal for residential, industrial, agricultural lands, and commercial places. Solar panels, inverters, batteries, bidirectional and net meters, utility grid connectivity, voltage controlling and protection devices are necessary components for a hybrid solar system.
Note: The price of a solar system and its components may vary depending on location, manufacturer, efficiency, and other factors.
Pros
- Its battery storage is its biggest pro because the system is always working either with mainline supply, solar panels, or with battery backup.
- Works as an off-grid when power is supplied through panels. After sunset, it turns into an on-grid that takes power from the utility grid. At times of power outages, it goes into inverter mode and uses the battery backup.
- The active control of electricity consumption is known as load management or demand side management (DSM). Hybrid systems are equipped with components to control reference voltage.
- Since every unit of power generated by solar panels is utilized either by devices, stored in batteries, or fed into the utility grid, there are least to nil chances of any wastage.
Cons
- Complex system as it has different power outputs and connections and not everyone is an expert with wires and terminals.
- With a double connection, along with panels, batteries and inverters, it requires more wires and connectors, plugs, and fuses. All these components make it an expensive system. The average cost of a 6 kW hybrid solar system is around $20k-40k.
- Since the functioning of hybrid systems is complex, the number of devices compatible with them is also limited.
- With double connectivity and the inclusion of the required components, it may need more space than the other two systems.
If you ask the basic difference between a hybrid and off grid system, note that the former is connected with solar panels and utility grids whereas the latter is connected with only panels. Though both of them are backed by batteries yet, the hybrid system is more efficient in comparison to the off-grid.
Also See: Can Hybrid Inverter Work Without Battery?
On Grid Vs Off Grid Vs Hybrid Solar Efficiency and Lifespan
Efficiency
- Without expensive storage solutions, an on-grid solar system is more than 95% efficient.
- An off-grid solar system is less efficient with only a 70% to 80% efficiency rating.
- A hybrid solar system can have 85.1% efficiency.
Lifespan
The life expectancy of solar panels is at least 20 years and goes up to 50 years max. Similarly, solar inverters have distinct lifespans based on their type: string inverters (10 – 15 years), power optimizers (20 – 25 years), and micro inverters (15 – 25 years).
So, based on the lives of inverters and panels, an on-grid, off-grid, and hybrid solar panel may last somewhere between 20 and 25 years. However, if we compare these three, the hybrid system has a shorter lifespan.
Also See: How Many Solar Panels to Run a House Off-Grid?
Which is Better On Grid or Off Grid or Hybrid Solar?
Generally, on-grid solar setups are suggested for residential and commercial purposes as they are both cost-effective and efficient. If you are in areas with unreliable power supply or the local electricity supply is too far to get a connection, then go for off-grid. But, if you are looking for reliability, constant power supply, and efficiency, you can opt for a hybrid system.
Note: Choices and preferences must be made after consulting with the solar installer.