Grid Tie- vs Stand-alone Systems

The stand-alone and grid-fallback are two types of solar power systems that work quite similarly to each other. These systems function at 12 volts, 24 volts and 48 volts. These are very low voltages required for the solar systems’ functioning. Solar panels work similarly to most batteries, in that they are units that can function on low voltages. Therefore, building a stand-alone solar system is easier and simpler; it is also a safer approach that offers more flexibility.

Grid tie systems

In contrast, grid tie systems are usually larger solar installations. They can generate a higher amount of electricity; usually a few kilowatts at any one time. With the higher voltage required for generation, it is best to connect the solar panels in series so that the electricity can be converted to AC current. A grid tie inverter usually performs this task.  Grid tied solar systems are commonly used for linking a few solar panels to generate a very high voltage before passing through the inverter. The amount of electricity generated from the solar array could be a few hundred volts.

Benefits

A higher voltage has many benefits, one of which is efficiency. A high-voltage system will suffer much less power loss than a system with low voltage. Grid tie inverters systems are functionally more efficient at higher voltages, which in turn make the total solar system more efficient.

Disadvantages

There are two disadvantages with grid tied high voltage systems. First, from a safety perspective, an electrocution is more likely to have fatal consequences. Second, future system expansion is often a more complex task if it is not taken into consideration during the system’s design and installation stages. Due to the safety considerations, extra steps must be taken in order to ensure that the grid tied solar power system is completely safe in every aspect during its functioning.