Jan 28, 2021
Some insights on plug-in grid-connected photovoltaic inverters
Plug-in grid-connected photovoltaic inverters have appeared in Australia-what are they, how do they work, and should you use one too?
A photovoltaic inverter is an electronic box that converts the direct current (DC) generated by the solar panel array into alternating current (AC), which is suitable for home appliances and transmits it to the main grid.
The traditional solar inverter, which can handle the output of multiple solar cell modules, is usually installed near the meter box. The micro-inverter is a new type of inverter recently developed. It has the characteristics of smaller size, can work with a single solar panel, and is installed on the back of the panel, creating what is usually called an AC solar panel.
The installation of the most common photovoltaic inverter in a home system requires a qualified electrician to operate it because they are qualified to connect the wire to the meter.
The new "plug and play" inverter is very different-this is a portable device that can connect solar panels or small wind turbines to the inverter, and then plug the inverter directly into a standard household power source Socket; power generation for home appliances. Although it is less than the capacity of a standard residential solar inverter, multiple units can be used.
This sounds like a great idea, but consumers may need to be cautious when considering a plug-and-play grid-connected inverter.
This issue has been discussed in the forum on energy issues. One of the points is that although the Clean Energy Commission (CEC) will launch plug-and-play inverters and approve the acquisition of renewable energy certificates (RECs), Under important security standards, their certification still seems questionable.
AS-4777 standard is one of the standards for connecting the energy system of the inverter to the grid. In order to be approved for listing by the Clean Energy Council (CEC), the inverter "must be tested in a suitable testing laboratory against AS4777.2 and 3-2005 (or equivalent) and AS3100 (or equivalent) standards. "
However, in AS4777.1 (installation requirements, Article 5.3.1), it clearly states: "The inverter should be connected to a dedicated circuit on the distribution switch through fixed wiring." If AS-4777 is strictly followed, this seems to avoid the use of any type of plug-and-play equipment.
Another important issue involves power distributors. Before the generator can be connected to the grid (including installing solar panels on your house and transmitting electricity to the grid), it is necessary to obtain the approval of the dealer. This approval is not just a short phone call or verbal "yes, it can be done" can be determined-it needs to be determined by paperwork.
In addition, the safety of these individuals has also been improved. The plug-and-play inverter has the function of anti-islanding effect, which can prevent individuals from continuing to provide power during a power outage (because the power will continue to be supplied for 2 seconds). If the plug is unplugged from the power socket, it can still release instant power.
Finally, when consumers consider installing a plug-and-play grid-connected inverter, they should check with the insurance company to ensure that the use of this device does not affect the coverage of home insurance, especially as a DIY project.
Although it is a great idea in theory, these potential problems have led some people to the idea of plug-and-play inverters.