OV-Vbackup: Grid backup overload

The "OV-Vbackup" error suggests that the inverter's backup circuit, which supplies power during grid outages, is being subjected to an excessive load. This typically occurs when the power demand from connected appliances or devices exceeds the inverter's backup capacity.

Why it's problematic

An overloaded backup circuit can lead to inverter shutdown, tripping of circuit breakers, and potential damage to the inverter or connected equipment.
It disrupts the backup power supply during grid outages, leaving critical loads without power.

Possible causes

Excessive Load: Too many appliances or devices are connected to the inverter's backup circuit, exceeding its rated power output capacity.
Simultaneous Operation of High-Power Appliances: The concurrent use of multiple high-power appliances, such as air conditioners, heaters, or pumps, can overload the backup circuit.
Malfunctioning Appliance: A faulty appliance drawing excessive current can trigger the overload condition.
Inverter Configuration: The inverter may be improperly configured for the backup load, leading to an overload situation.

Before you begin

Safety First: Working with electrical equipment always involves risks. Ensure you are qualified and follow appropriate safety precautions. Disconnect the inverter from both AC and DC sources before performing any physical inspection or adjustments.

Gather Information: Before starting troubleshooting, have the inverter manual on hand. You should also gather information about the inverter model and serial number, the installation date, and the PV array configuration (number of panels, capacity, and number of strings).

Troubleshooting steps

Identify Connected Loads: Create a list of all appliances and devices connected to the inverter's backup circuit. Note their power ratings (watts or amps).
Prioritize Essential Loads: Determine which appliances are truly essential during a grid outage.
Reduce Load: Disconnect or turn off non-essential appliances to reduce the load on the backup circuit. Prioritize loads based on their importance and power consumption.
Stagger Appliance Use: Avoid running multiple high-power appliances simultaneously. Stagger their operation to prevent an overload.
Check Appliance Functionality: Inspect individual appliances for proper operation. A malfunctioning appliance may be drawing excessive current.
Consult Inverter Manual: Refer to the inverter's manual to understand its backup power capacity and any load management settings that can be adjusted.

Verifying the solution

The "Grid Backup Overload" error should clear once the load on the backup circuit is reduced below the inverter's capacity. The inverter should resume normal operation, providing backup power without tripping any overload protections.

If the problem is not resolved

If the error persists after following all the above steps, there might be an internal fault within the inverter or an issue with the electrical wiring.

As a system owner: In this case, contact the inverter installer or distributor for further assistance. You can find the details of your installer in the MyAutarco app.
As a certified installer: Contact Autarco Support; you can submit a support case via Helios.