Troubleshooting Common Solar Inverter Problems: A Complete Homeowner’s Guide

By  ProSolar Media

On   5, 2025

2,163,992 Views

Solar Inverter Troubleshooting: Causes, Solutions, and Expert Tips

Your solar inverter is the brain of your solar power system. While generally reliable, issues can sometimes arise. This guide will help you understand common problems, their causes, and the right solutions to keep your solar power flowing smoothly.

Inverter Basics Power Issues Error Codes System Sizing Maintenance & Care Our Inverters Contact Us

Understanding Your Inverter

The solar inverter is the hardest-working component in your solar system. Its primary role is to convert the Direct Current (DC) electricity produced by your solar panels into Alternating Current (AC) electricity. This conversion is essential because all standard appliances in your home—from your television and refrigerator to your lights and chargers—run on AC power. Without a functioning inverter, the energy generated by your panels is unusable in your home.

There are several types of inverters, but for residential use in Zimbabwe, the most important distinction is between standard inverters and hybrid inverters.

• Standard Inverters (Grid-Tied): These inverters convert DC to AC power for immediate use and must shut down during a grid outage for safety.
• Hybrid Inverters: These are the "brains" of a modern solar and battery system. They can intelligently manage power from solar panels, batteries, and the ZESA grid simultaneously. This capability is what allows your home to have uninterrupted power during load shedding, as it can seamlessly switch between power sources.

At Sona Solar, we specialize in high-quality hybrid inverters from trusted brands like Must, Growatt, SRNE, Codi, and Primax, ensuring you have a seamless power supply.

While often used interchangeably, kVA (kilo-volt-ampere) and kW (kilowatt) measure slightly different aspects of power.

• kW (Real Power): This is the power that actually does work, like lighting a bulb or running a motor.
• kVA (Apparent Power): This is the total power consumed by a system, including real power (kW) and reactive power (power needed for magnetic fields in motors, etc.).

For household purposes, a 5kVA inverter is roughly equivalent to a 5kW inverter. However, kVA is the industry standard for rating the total capacity an inverter can handle. It's the most important figure to consider when matching an inverter to your home's peak electricity demand.

Troubleshooting Power Issues

This is one of the most frequent issues and can stem from several causes:

• Shading on Solar Panels: Even partial shading from trees, buildings, or debris can drastically reduce the entire system's power output.
• Dirty Panels: A layer of dust, bird droppings, or pollen can block sunlight and lower efficiency by up to 25%.
• Inverter Fault: While less common, an internal fault in the inverter can lead to decreased power.

Solutions:

• Check for Shading: Regularly trim any tree branches that have grown to cover your panels.
• Clean Your Panels: In Zimbabwe's dry season, dust is a major factor. We recommend cleaning your panels every 1-2 months.
• Check Inverter Display: If the panels are clean and unshaded, check the inverter's display for any error messages. If an error is present, contact a Sona Solar technician.

A complete shutdown is almost always a safety feature. The most common causes in Zimbabwe are:

• Grid Outage (Load Shedding): For safety, grid-tied inverters must shut down during a ZESA power cut to prevent sending power to the grid, which could endanger utility workers. This is called "anti-islanding". Your system should automatically switch to battery power if you have a BESS.
• Inverter Overload: If you try to run too many high-power appliances at once (e.g., stove, kettle, borehole pump), the inverter will shut down to prevent damage.
• Inverter Overheating: Inverters generate heat. If installed in a poorly ventilated space like a sealed cupboard or in direct sunlight, they can overheat and shut down to protect internal components.

Solutions:

• Manage Your Appliance Usage: Be mindful of how many heavy loads you run at the same time.
• Ensure Proper Ventilation: Check that the inverter has at least 30cm of clear space around it for airflow.
• System Reset: If the cause is resolved (e.g., grid power returns), you may need to reset the system. Refer to your manual or contact us for the correct procedure. If shutdowns persist, professional diagnosis is required.

Understanding Error Codes

Modern inverters are excellent at self-diagnosis and will report issues with specific error codes. If you see one, follow these steps:

1. Do not panic. Most errors are minor or are simply providing information.
2. Document the Error: Take a clear photo of the error message or write down the exact code number and any accompanying text.
3. Consult the User Manual: Your inverter's user manual will have a troubleshooting section that explains what each error code means and may suggest a simple solution, like a system reset.
4. Contact Sona Solar: For any error codes that persist or that the manual identifies as critical, it is crucial to contact us. Provide us with the error code and your inverter brand. Our technicians can often diagnose the issue remotely or schedule a site visit.

System Sizing & Compatibility

The size of your battery bank should be matched to your inverter's capacity and your energy needs. A common rule of thumb is:

• For a 12-volt inverter, you need a minimum battery capacity of about 20% of the inverter's wattage in Amp-hours (Ah). For a 1.5kVA (approx. 1200W) inverter, this means at least 240Ah of battery capacity.
• For a 24-volt inverter, this is around 10% of the inverter's wattage in Ah. A 3.5kVA (approx. 3000W) inverter would need at least 300Ah of battery capacity.

Important: This is just for powering the inverter. The total battery capacity you need must also account for all the appliances you wish to run and for how long. Our team performs a detailed load assessment to ensure your battery bank is correctly sized for your specific needs.

Yes, but it depends on the inverter's power rating and its peak surge capacity. Appliances with motors (like pumps, fridges, and air conditioners) require a high starting current that can be 5 to 12 times their normal running wattage.

For example, an 800-watt microwave might need 1200-1300 watts to run. Sona Solar inverters from brands like Must, Growatt, and Primax are designed to handle high peak currents. It is essential that your inverter is sized correctly for these loads. We will assess all your heavy appliances during our site survey to recommend an inverter that can safely power them.

Maintenance & Care

Proactive care is the best way to ensure the longevity and optimal performance of your solar inverter. We recommend the following:

• Schedule Annual Inspections: A qualified Sona Solar technician should inspect your entire system once a year. This includes checking all electrical connections, verifying component health, and identifying potential issues before they become major problems.
• Keep the Inverter Area Clean: Regularly clear dust, leaves, or any other debris from around your inverter. Blocked vents are a primary cause of overheating.
• Monitor Your System's Performance: Most modern inverters come with monitoring apps. Make it a habit to check your system's daily energy production. A sudden, unexplained drop in output is often the first sign of an issue with the panels or the inverter.

A high-quality inverter from a reputable brand is a durable piece of equipment. Generally, you can expect a good hybrid inverter to last between 7 to 12 years. The lifespan can be influenced by factors like the operating environment, the electrical load it handles, and how well it is maintained. At Sona Solar, we only stock brands like Must, SRNE, and Growatt that are known for their reliability and come with robust manufacturer warranties, ensuring your peace of mind.

Our Trusted Inverter Brands & Models

We stock a wide range of high-quality inverters to build the perfect system for any need, from small homes to large commercial applications. Below are some of the brands and sizes we regularly provide.

These inverters are ideal for basic backup power, running essential appliances like lights, TVs, routers, and charging devices.

• Sumry: 1kVA 12V, 2kVA 12V
• Palitron: 1kVA 12V
• Must: 1kVA 12V, 1.5kVA 12V

Perfect for small to medium-sized homes, these inverters can comfortably power refrigerators, entertainment systems, and office equipment.

• Sumry: 3.2kVA
• Codi: 3.5kVA, 4.2kVA
• Must: 3.0kVA (145VDC), 3.2kVA (160VDC)
• Hanchu: 3.5kVA 24V
• SRNE: 3kVA (108VDC)

These powerful inverters are designed for larger homes and businesses, capable of running demanding loads like borehole pumps, air conditioners, and multiple heavy appliances simultaneously.

• SRNE: 5kVA (48V, 500V Grid), 10kVA (48V, 500VDC), 12kVA Transformer, 12kVA 3-Phase
• Must: 5.2kVA (450VDC), 6kVA, 6.2kVA (500V), 10kVA, 12kVA, 15kVA CS
• Codi: 6.2kVA HV (60-500V)
• Growtech: 6.2kVA (500VDC)
• Growatt: 6kVA (48V, 500VDC)
• Deye: 6kVA (48V Off-Grid)
• Primax: 8kVA (48V), 8kVA (Dual MPPT), 11kVA (48V), 11kVA (MPPT)

Expert Help is Just a Call Away

While this guide covers the most common issues, some problems require professional expertise. If you're experiencing persistent issues with your solar inverter, don't hesitate to contact the experts at Sona Solar Zimbabwe. We are here to ensure your investment continues to provide clean, reliable power for years to come.

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We Are a Dedicated Solar Energy Company in Zimbabwe: Pro Solar Solutions Zimbabwe is a leading solar energy provider based in Harare, supplying homes, offices, and industries across Zimbabwe and Africa with reliable, 24-hour uninterrupted power. We specialize in premium solar systems using trusted brands such as Canadian Solar, Jinko, JA, and Longi solar panels, Must, SVolt, and EVolt lithium-ion batteries, and Growatt and Must inverters.

Pro Solar Solutions Zimbabwe is committed to delivering affordable, sustainable, and reliable solar energy installations. Our goal is to ensure every Zimbabwean has access to clean, cost-effective, and efficient energy solutions, tailored for homes, offices, and businesses. Our product range includes home and industrial solar systems, inverter backup solutions, off-grid systems, mini-grid solutions, and solar water pumping systems — all designed to perform optimally in Zimbabwe’s climate while reducing electricity costs and ensuring energy independence.