Why Consider PV Solar
Energy from the sun is free and it will continue to shine. PV solar does not emit CO2, which damages the environment. Reduces your dependence on fossil fuel and power utilities. Efficient for both commercial and residential use. More affordable.
A grid-tied system is a basic solar installation that uses a standard grid-tied inverter and does not have any battery storage. This is perfect for customers who are already on the grid and want to add solar to their house. These systems can qualify for municipal incentives which help to pay for the system.
One disadvantage of this type of system is that when the power goes out, so does your system. This is for safety reasons because linemen working on the power lines need to know there is no source feeding the grid. Grid-tied inverters have to automatically disconnect when they don’t sense the grid. This means that you cannot provide power during an outage or an emergency and you can’t store energy for later use. You also can’t control when you use the power from your system, such as during peak demand time.
But if a customer has a basic grid-tied system, they are not out of luck if they want to add storage later. The solution is doing an AC-coupled system where the original grid tied inverter is coupled with a battery backup inverter. This is a great solution for customers who want to install solar now to take advantage of incentives, but aren’t ready to invest in the batteries just yet.
A customer can benefit from metering because when the solar is producing more than they are using, they can send power back to the grid. But in times when the loads are higher than what the solar is producing they can buy power from the utility. The customer is not reliant on the solar to power all of his or her load. The main take away is that when the grid goes down, the solar is down as well and there’s no battery back-up in the system.
Grid-Tied PV Solar Systems
Grid-tied system with battery back-up
The next type of system is a grid tied system with battery back-up, otherwise known as a grid-hybrid system. This type of system is ideal for customers who are already on the grid who know that they want to have battery back-up. Good candidates for this type of system are customers who are prone to power outages in their area, or generally just want to be prepared for outages.
You are able to back up essential loads such as lighting and appliances when the power is out. You can also use energy during peak demand times because you can store the energy in your battery bank for later use. Cons of this system are that they cost more than basic grid-tied systems and are less efficient. There are also more components.
The addition of the batteries also requires a charge controller to protect them. There must also be a sub panel that contains theimportant loads that you want to be backed up. Not all the loads that the house uses on the grid are backed up with the system. Important loads that are needed when the grid power is down are isolated into a back-up sub panel.
Off-grid systems are great for customers who can’t easily connect to the grid. This may be because of geographical location or high cost of bringing in the power supply. In most cases, it doesn’t make much sense for a person connected to the grid to completely disconnect and do an off-grid system.
Because the system is your only source of power, many off-grid systems contain multiple charging sources such as solar, wind and generator. You have to consider weather and year round conditions when designing the system. If your solar panels are covered in snow, you need to have another way to keep your batteries charged up. You also will most likely want to have a back-up generator just in case your renewable sources are not enough at times to keep the batteries charged.
The benefits of an off grid system is that a person can become energy selfsufficient and can power remote places away from the grid. You also have fixed energy costs and won’t be getting a bill from your energy use. Another neat aspect of off grid systems is that they are modular and you can increase the capacity as your energy needs grow. You can start out with a small, budget-conscious system and add on over time.
One disadvantage is that off-grid systems may not qualify for some incentive programs. You have to also design your system to cover 100% of your energy loads, and hopefully even a little bit more. Off-grid systems have more components and are more expensive than a standard grid-tied system as well.