The overvoltage graph shows the maximum grid voltage of your main connection. At a grid voltage of 253 volts or higher, your solar panel inverter will switch off. The overvoltage graph helps you to identify and prevent potential shutdowns of your inverter in a timely manner.
What do I need to get the overvoltage graph in the app?
To unlock the overvoltage graph, you need Energy+ and a smart meter that supports voltage data.
Do you have a smart meter with SMR version 5 or higher? Then your smart meter supports voltage data. The graph will then automatically appear in the HomeWizard app. You can also access the graph via the Power total graph by switching to 'Overvoltage' at the bottom right of your screen.
What does the overvoltage graph show?
The overvoltage graph shows the maximum grid voltage currently measured on your main connection. If you have a 1-phase connection, you will see one line in the graph. With a 3-phase connection, each phase is shown as a separate line.
In the day, week, month, and year views, you will see the highest measured voltage per phase. The white dotted line indicates the maximum of 253 volts.
Where can I see if my smart meter supports voltage data?
If you are unsure whether your smart meter supports voltage data, you can look this up in the HomeWizard app:
Tap the cogwheel icon in the top right of your screen.
Go to Devices and click on the P1 Meter.
In the list under meter readings, look for Voltage.
If you see a value but do not see the overvoltage graph in the app, you either don't have Energy+ or the overvoltage graph is disabled. You can enable or disable the overvoltage graph in the menu via Graphs > Overvoltage.
If it says 'N/A', your smart meter does not support voltage data. Your smart meter must support SMR version 5 or higher to pass voltage data to the P1 Meter.
Will there also be an overvoltage graph for the kWh Meter?
There are currently no plans to make the overvoltage graph available for the kWh Meter.
What can I do if my solar panel inverter switches off?
If your inverter switches off, it usually has one of these two causes:
the grid voltage in your neighbourhood is too high (overvoltage)
the installation of your inverter needs to be improved
Check if the overvoltage graph shows 1-phase or 3-phases. Does your graph have one dotted line and 3 colored lines? Then you have a 3-phase grid connection. Does your graph have one dotted line and 1 colored line? Then you have a 1-phase connection.
I have a 3-phase connection: View the 3-phase graph in the day view and see on which phase(s) power is being fed back to the grid (L1, L2, and/or L3). These are the phases to which your inverter is connected. Go back to the overvoltage graph and check if one of the phases you are feeding back to is higher than 250 volts.
I have a 1-phase connection: Go to the overvoltage graph and check if the total of the phase is higher than 250 volts. A voltage higher than 250 volts can indicate overvoltage.
The grid voltage is higher than 250 volts and my inverter switches off.
Do you have a 3-phase connection? Check the overvoltage graph to see if there is another phase with a lower grid voltage. Less solar energy is being fed back into the grid on that phase in your neighbourhood.
You can have the solar panel inverter moved to this phase. This will prevent your inverter from switching off and balance the surplus of solar energy on the electricity grid.
If you have a 1-phase connection, you can contact your grid operator. They can adjust the electricity grid in your neighbourhood to prevent overvoltage.
The grid voltage is lower than 250 volts and my inverter switches off.
If the cable between your inverter and the main connection is too long or too thin, the voltage at the inverter can be higher than 250 volts, even if the grid voltage is lower than 250 volts. In that case, you can have the wiring shortened or thickened by an electrician.
In some cases, you can see the voltage of your inverter in your inverter's app or on its display. The inverter usually switches off at a voltage of 253 volts or higher.