All Collections
Using HomeWizard Energy
Graphs
What is the overvoltage graph?
What is the overvoltage graph?
Updated over a week ago

You need Energy+ and a smart meter for this feature. Your smart meter needs to support voltage data to unlock the overvoltage graph.

What does the overvoltage graph show?


With the overvoltage graph, you can see the ''health'' of your grid connection. A high voltage causes solar inverters to turn off. Typically, solar panel inverters in your district cause a higher grid voltage when there is too much solar surplus that is not used. A grid voltage that is too high can damage your household's devices. For this reason, solar inverters automatically turn off, or in some cases, decrease output, when the output voltage is above 253 V.

The overvoltage graph shows the maximum grid voltage that is being measured. This graph either has 1 line or 3 voltage lines, depending on whether your main connection is 1-phase or 3-phases. On the day, week, month and year view you can see the highest measured voltage per phase. The dotted white line shows the grid maximum of 253V.

What can I do if my solar inverter turns off?


If your solar inverter turns off, it's typically one of two causes. Either the grid voltage is too high, or the installation of your inverter needs improvement.

Step one is to check if your overvoltage graph has 1-phase or 3-phases. If your graph has a dotted line and 3 colored lines it means you have a 3-phases mains connection. If your graph has a dotted line and 1 colored line, you have a single-phase mains connection.

  • 3-phases: if you have a 3-phase mains connection check the 3-phase graph for the phases that you export on (L1, L2 and L3) in the day view. Now go back to the grid voltage graph and check if any of the phases that you are exporting on is above 250 V.

  • 1-phase: if you have a 1-phase mains connection go to the overvoltage graph and check if the phase's total is above 250 V.

My phase is above 250 V and my inverter turns off

Check the Overvoltage graph to see if there is another phase with a lower voltage. This phase has less solar surplus in your district. You can have your solar inverter moved to a lower voltage phase if you have a 3-phase connection in your circuit breaker box. Doing this may help prevent your inverter from turning off and balance the solar surplus on the grid. If you have a single-phase mains connection, you can contact your grid operator. They can make adjustments to the grid in your district to prevent overvoltage.

My phase is below 250 V and my inverter turns off

Check if there is another phase with a lower voltage in the overvoltage graph. This phase has less solar surplus in your district. You can have the solar inverter moved to a lower voltage phase if you have a 3-phase connection in your circuit breaker box. Doing this may help prevent your inverter from turning off and balance the solar surplus in the grid.

If your cable between the mains connection and your inverter is too long or too thin, it can cause the voltage at the inverter to be higher than 250 V, even though the grid voltage is below 250 V. In this case, it is advised to change the wiring to your inverter to be either shorter and/or thicker. In some cases, your inverter app may also be able to show you the voltage at the inverter. The inverter usually turns off at 253 V.

Did this answer your question?