Normal Voltage Drop

It is not normal to see a voltage drop of 60-70 VAC (277 V to 206-215 V) when a 50 kW inverter is connected to the grid. A voltage drop of this magnitude can cause problems for other devices connected to the grid.

Causes

The following factors could contribute to the voltage drop: Transformer Impedance

The utility transformer's impedance can cause a voltage drop, especially if the load is high or reactive.

Inverter Power Factor

If the inverter is operating with a low power factor, it can inject reactive power into the grid, which can further reduce the voltage.

Line Resistance and Impedance

The resistance and impedance of the transmission lines connecting the inverter to the grid can also contribute to the voltage drop.

Other Load

If there are other heavy loads connected to the grid near the inverter, they can draw current and cause a voltage drop.

Possible Solutions

To mitigate the voltage drop, you can: Check Transformer Specifications

Ensure that the utility transformer is rated for the load and has adequate impedance.

Improve Inverter Power Factor

Install a capacitor bank or other device to improve the inverter's power factor.

Reduce Line Losses

Use shorter or thicker transmission lines to minimize line resistance and impedance.

Isolate Loads

Connect the inverter to a dedicated grid connection or circuit to minimize interference with other loads.

Additional Considerations The voltage drop may not be constant and can vary depending on the time of day and grid conditions. If the voltage drop is consistently high, it could indicate a problem with the grid infrastructure or the inverter itself.* Contact your utility if you are concerned about the voltage drop or require assistance in troubleshooting it. Flag for review