The solar inverter, also known as the power inverter, represents the most important piece of equipment that converts DC output from solar panels into AC electricity, so that our appliances, computers and other appliances can operate. It also monitors and controls the PV array system, among other things.
Inverters are generally installed near the main electrical switchboard and in a protected area, so harsh environmental conditions can't affect them.
Unlike string and micro solar inverters, the central inverter is able to handle all of the DC terminals from solar panels, so it's one inverter for all the panels. Hence, the central inverter power capacity is higher than string and micro solar inverters. As you look at the DC side of the central inverters, you see that the DC voltage will be high, between 600 and 1000VDC, and that the inverter power may be up to 5MW.
Why do central solar inverters have advantages over local ones?
1. Developing technology that is reliable and safe:
We deal with the central solar inverter since many years ago, it has been installed and is doing well, and this makes it more credible.
Due to its one inverter that is able to handle all the solar array, it is less expensive than other solar inverters (string and micro).
3. A more reliable source:
As mentioned, our central inverter is usually situated within a room or an enclosed area and, aside from bad weather, is not subjected to harsh climate conditions, thus increasing its reliability.
Inverters with central controls are disadvantageous in what ways?
1. When there are shaded or damaged solar panels:
In case of central inverter systems, most of the panels are connected in series, therefore when 5% of the panels are shaded or fail for any reason, there is a 20 per cent loss in output power.
2. Only one inverter and risk of DC voltage:
It reaches 1000 volts or more for the central inverter which raises concerns for installers and operators, and since there is only one inverter, if there is a defect the whole solar system will be destroyed.
3. Costly replacements:
In case of failure, its high cost and capacity make its replacement expensive.