Get Adobe Flash player
  Solar & Renewable Energy Specialists.  
Specializing in Grid Connect, Solar Hybrid, Standalone Systems and Emerging Technologies.

Standalone Solar System

  The Standalone Solar System is used when the premise is too far from the Grid and or when the cost to connect to the Grid is too expensive for the power that would be utilized by the household. 

A Standalone Solar System is a system that if designed correctly will produce all the power that the household requires, without the added benefit of the grid as a failsafe.


There are 2 main types of Standalone Solar Systems.

The DC (direct current) Coupled System.
The basic components of the DC Coupled Solar System are the Solar PV (photovoltaic) panels. The panels produce DC power travels directly to a charge controller or regulator and then into the Batteries. The household will draw its power directly from the Batteries and all appliances are DC powered. Generators can be used and in most cases are a necessity, in the event that the Batteries are not able to supply the required amount of power needed. As this type of System draws its power directly from the batteries first, it might dramatically reduce the life of the Batteries, because a greater DOD (depth of discharge).


The Graph below shows the life of the battery based on the amount of power discharged.

Innolec Solar Power Graph 7.0
 
The AC (Alternating Current) Coupled Solar System.
It is typically similar to a Solar Hybrid System but without the added cost related to network charges of the Grid. The panels produce DC power, which is then converted to AC by the Inverter which then goes to a Controller, but unlike the DC Coupled System where the power goes into the Batteries, the AC Coupled System supplies the home first with the remaining power going into the Batteries. What this means is a smaller portion of the homes power load is supplied directly from the Batteries and as the graph above shows the batteries will ultimately last longer. A Generator and wind turbine can also be used. This system would be better suited by homeowners that are moving from a home which is connected to the Grid as all their appliances run on AC power. Where as if they were to move into a home with a DC coupled System the appliances they already have can become unusable.


An AC Coupled System is typically more expensive than a DC coupled System due to higher equipment cost and in smaller systems will be disproportionally higher than in a larger system but with the AC System the batteries should last longer if the System has been  designed correctly.