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Hello, today, Solar Housekeeper will introduce the precautions!! Using the grid-go circuit to mix AC 220V home electricity + high-voltage DC from the solar panel. If we use it incorrectly, it will cause a risk that our inverter may be damaged or may get an electric shock from the electricity flowing back into the solar panel or the device.
First of all, I have to inform you. In this topic, I originally intended to inform you about the precautions for using the grid-go circuit when testing it for real use.
- But a fellow member reported about the precautions for using it with a device connected to the ground wire from the AC OUT (because the inverter will have 2 power output lines) that may cause the device to break.
And another person reported about the leakage of electricity and short circuits back to the panel if connected together using a single 5-pin bridge diode. Because even though the electricity is converted, it is not isolated, so there is still electricity in both lines, whether + or -.
So it is the origin of making this clip first, separate from the clip of the real use, to inform you of the precautions for using it safely. And get the most benefit from the use
Because my presentation is still just an experiment or a guideline for use as a backup panel in case there is an announcement of new regulations from PEA. If there is a real ban on connecting AC IN ports in hybrid inverters
Because now the previously issued documents are still only guidelines for PEA K2, which are provinces in the Eastern region. There are no new regulations announced for actual use. As far as I know, there is still only
On-grid systems that require permission to use in order to request parallel power.
In the future, we do not know if there will be any regulations or what they will be. From the guidelines, we can see that PEA has already prepared guidelines for use with solar cell users.
And the reason we came out to find a backup solution to deal with it is because we do not want to waste time contacting agencies, which will be complicated and take time to contact many times, including the cost of the operation.
So it is the origin of finding a system or usage that is correct, not against the regulations or against the law, that's all.
But it all depends on the user of the solar cell system as well, how much awareness they have.
Some hybrid inverters will be on-off grid systems, meaning they can be set to on-grid or off grid. Just go to turn it on-off in the menu of the device.
And there will be some selfish people who secretly open an on-grid system or some people call it a "hidden grid" system, but it is a minority.
In order to push the meter to rotate backwards so that the electricity bill will be cheaper.
It is the origin of many problems until it became a guideline book, as in the news before.
Therefore, people who use the solar cell system themselves must have a sense of responsibility in this matter. Do not think only of taking advantage. It is not worth it.
Cautions
- 1. Inverters that will be used to mix electricity from the grid circuit must not connect the ground wire at the AC OUT port.
When passing through the bridge diode, it only cuts the wave to convert it to DC current, but does not isolate it. Therefore, there is electricity on both lines, like normal AC.
Because the AC that we use in our homes normally has electricity on both lines, but the Electricity Generating Authority of Thailand specifies that there must be an L Line and a Neutral N line, which means taking one line as a Neutral line to the ground.
Therefore, when we use it through the grid circuit by connecting it to the PV IN port of the inverter That has an additional ground wire at the AC OUT port to leave only 1 power wire
It will cause the device to short-circuit and break. And the member also sent the link of Technician Lak to see. You will see that the power receiver from the PV IN port is broken and damaged.
So if anyone is going to use this system, do not connect the ground wire of the AC OUT port of the inverter. As for the ground of the device, I think there should be no problem. It should still be connected normally.
As for connecting the ground or the ground wire of the AC OUT to leave 1 power wire, I will make a separate clip for you when you actually use it.
Now the panel is up. All that is left is to run the electrical system, power wires, ground wires, install the device and various devices.
- 2. If using 1 bridge diode, the power will flow back into the solar panel.
In the case of using mixed power using only 1 bridge diode
As mentioned above, when AC power is converted to DC, it is not isolated. There is still power from both lines. When we connect them together, the power will flow back up to the solar panel.
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