What does Inverter Error 04 mean?

Inverter Error 04 indicates that the battery voltage in your solar system has dropped below the inverter's required operational threshold. This safety feature prevents the battery from deep-discharging, which can cause permanent damage.

What are the most common causes of Error 04?

The most common causes are excessive power consumption (overloading), insufficient charging from solar panels (due to dirt or shade), old or failing batteries, and loose or corroded battery connections.

How can I quickly fix Error 04?

First, reduce your load by switching off non-essential, high-power appliances. Second, check that your solar panels are clean and receiving direct sunlight to allow the battery to recharge. If the error persists, you may need to check your battery connections or have the system professionally inspected.

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By Sona Brands

On 17, 2024

11,990,689 Views

Inverter Error 04 (Battery Voltage Too Low): A Zimbabwe Troubleshooting Guide (2025)

In Zimbabwe, where solar power is essential, even the most reliable systems can have issues. One of the most common is Inverter Error 04: Battery Voltage Too Low. This guide from Sona Solar Zimbabwe will help you diagnose and resolve this error to keep your system running smoothly.

A technician troubleshooting a solar inverter error code.

Diagnosing Inverter Error 04

Use a multimeter to measure the voltage directly at the battery terminals. If it is below the recommended level for your system (e.g., below 44V for a 48V system), this confirms the low voltage issue.

Ensure that your solar panels are clean and free from dust, leaves, or any obstructions that could be blocking sunlight and preventing effective charging.

Check for any loose, dirty, or corroded connections on the battery terminals. A poor connection can significantly impede the flow of electricity and prevent the battery from charging correctly.

Identify and reduce the use of high-power appliances (like booster pumps, heaters, or stoves) during periods of low sunlight or at night. Overloading the system is a primary cause of rapid battery discharge.

Solutions for Low Battery Voltage

During cloudy periods or at night, immediately switch off non-essential, high-power appliances to conserve battery power and allow the system to stabilize.

Schedule regular maintenance. Clean your solar panels monthly, check battery connections for tightness and corrosion, and ensure all components are functioning correctly.

If your battery is old or damaged, it may be time for an upgrade. A new, high-quality Lithium-ion battery from a trusted brand will offer superior performance, a longer lifespan, and better resilience to deep discharging.

Frequently Asked Questions

Most inverters reset with a simple power cycle. Turn the inverter completely off, wait for a minute, and then turn it back on. For a hard reset, disconnect all power sources (grid, solar, and batteries), wait several minutes, and then reconnect, starting with the battery first.

Besides low battery voltage, common faults include faulty power switches, loose connections, and general battery failure due to age. Reduced backup time is often the first sign of a failing battery.

While Error 04 on a solar inverter refers to battery voltage, an "E4" error on other appliances, like an air conditioner, typically indicates a problem with a temperature sensor or its wiring, which is a completely different issue.

Recent advancements in battery technology have led to more efficient and longer-lasting batteries, with modern inverters offering smart features for better real-time monitoring and management.

Inverter Error 04 can be frustrating, but it is manageable. By understanding the causes and performing regular maintenance, you can ensure your system operates reliably. For persistent issues, or to invest in quality components, always consult a trusted provider like Sona Solar Zimbabwe.

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