What is AC or DC Coupling?
Solar batteries are becoming a popular addition to Solar PV systems, due to their long list of benefits. Including allowing you to power your home at night, and make further savings.
There are two types of battery installation systems, known as DC and AC coupling. AC or DC coupling refers to the way solar panels link to a solar battery or energy storage system. They are known as a DC (Direct Current) or AC (Alternating Current) system due to the electrical connection between the solar PV array and battery. The key distinction between an AC-coupled and DC-coupled battery systems lies in the journey the electricity takes once generated from the solar panels. As solar panels generate DC electricity, it must transform into AC electricity in order to power your home’s appliances. However, solar batteries store electricity in DC form.
Historically, AC-coupled battery storage systems have been more common for residential and commercial solar installations. But as more DC options become available, DC coupling is gaining in popularity. Both AC and DC coupling have advantages and drawbacks. With the many varieties of battery storage systems now available, the blog will explore the pros and cons of each
AC Coupled Solar Batteries
In an AC-coupled system, DC electricity flows from your solar panels to an inverter. An inverter, transforms the electricity into AC electricity ready to power your home. However, if this energy isn’t needed, it then goes into another inverter that transforms it back into DC in order to store it into your solar battery. When this energy is in demand, it is then inverted again through an AC-to-DC power unit. This is so it is safe to use within our home appliances.
To conclude, with an AC-coupled system, any electricity stored in a battery system will need to be inverted a total of three times before use.
AC coupled batteries or simply ‘AC batteries’, are a relatively new evolution within the world of grid connected home storage. AC batteries consist of a lithium battery module, a battery management system (BMS) and inverter/charger all in one compact, simple unit. This makes them easy to install in most homes, especially when it comes down to upgrading battery storage systems. The most well-known AC battery is Tesla Powerwall 2.
Nonetheless, this doesn’t limit your selection of solar battery options. You can create an AC battery system by “retrofitting” an AC coupled battery inverter together with a common DC battery. For example our best seller the 6.5kWh Growatt Battery, can be retro fitted with a Growatt SPA3000TL Controller Duo.
The Advantages of an AC Coupled Battery System
The Disadvantages Of an AC Coupled Battery System
DC Coupled Solar Batteries
The Advantages of a DC Coupled Battery System
The Disadvantages Of A DC Coupled Battery System
How much does it cost to install a solar battery?
Regardless of whether you choose an AC or DC coupled system, installing a battery storage system can increase your home’s use of green energy. If you already have a solar panel system installed on your property, and are looking to add battery storage as a retrofit, Deege Solar will always install an AC-coupled system. This is because you’ll already have a solar inverter system installed with your PV panels functioning perfectly
On the other hand, if you’re installing a solar panel system and battery at the same time, a DC-coupled system may be the better solution. Due to the higher efficiency. Here at Deege Solar, we install all of our Solar PV Systems as Hybrid DC to AC Systems. This is because hybrid systems, or grid-tied DC coupled solar battery systems, have less failure points. They also require less wiring and less liability on the national grid.
If you are looking to install a solar PV system for your home or business, or to upgrade your current storage solution, get in touch. Our green team here at Deege Solar