Off the grid systems – AC coupling vs DC coupling

There are different methods to connecting up an off the grid solar system. AC coupled, DC coupled and even hybrid configurations are common methods in which off the grid systems can be configured, albeit with advantages and disadvantages.

So how would you determine if an AC or a DC coupled system is the right one for you? You will have to take into account factors such as cost, performance, site considerations and features.

Below is a comparison of AC vs DC coupling for an off the grid solar system:

AC Coupling

- Modules produce DC current

- Inverter converts this DC current into AC and supplies the house directly

- The charge controller controls the charging of the

- The solar array can directly power houses during the day resulting in a higher efficiency

- AC coupled systems work at higher operating voltages which results in lower wire losses and increased efficiency

- Greater flexibility is available for the placement of the arrays

- As all of the energy inputs are controlled by the one charge controller, which leads to enhanced battery bank life expectancy.

- The optional generator is also AC coupled

DC Coupling

- Modules produce DC current