Solar panels, inverters and batteries are not maintenance-free. Like any technical installation, a solar power system needs regular inspection. Solar4you Head of Installation Andres Pihel and MarkeDroid’s Business and Industrial Projects Manager Sander Õispuu explain why preventive maintenance matters for safety, electricity production and smart energy management.
Solar4you has emphasised the need for regular maintenance for years. Yet customers often contact specialists only after energy production has been disrupted or a component has failed. Repairing a fault at that stage can be significantly more expensive than preventive inspection.
A single fault can cost as much as ten years of maintenance
Andres Pihel recalls an apartment association that opted out of annual maintenance. The connectors on a two-to-three-year-old inverter burned out and the repair cost approximately €2,400. By comparison, maintenance of the small installation in his example cost €150–200. These are illustrative historical prices from a specific case, not Solar4you’s current price list.
Failure to carry out required maintenance may also affect how a warranty claim is handled if a fault is linked to neglected maintenance. The precise outcome depends on the manufacturer’s conditions and the circumstances of the fault.
Modern maintenance involves more than looking at electrical connections. Solar4you inspects the AC side of a solar installation with appropriate measuring equipment and carries out dedicated tests on the DC side. The condition of the panels, cables and connections is assessed, along with measurements and possible insulation faults. A maintenance report documents the findings.
Comparing measurements over time can show whether a connection or other component has deteriorated since the previous inspection. At one site, abnormal test results pointed to oxidised terminals in an Elektrilevi connection cabinet. The network operator was notified so the fault could be corrected.
Over time, temperature fluctuations can affect electrical connections, while weather can damage panels and cables. Solar4you has found detached optimisers, broken panel glass, cable damage and entire groups of panels that had stopped generating electricity. When no one monitors inverter alerts or output data, such faults can remain undetected for years.
Maintenance also includes reviewing inverter error logs, updating software where necessary, and comparing actual output with expectations. This can reveal problems such as grid overvoltage or declining generation that may not be obvious from a simple operational status indicator.
The need to wash or clean panels depends on their location, contamination and the condition of the system. Specialist cleaning equipment and bird barriers may be useful in some circumstances. Solar4you offers panel washing as a separate service and rents selected equipment.
The entire solar and battery system needs attention
At some sites, solar panels and batteries have been installed by different companies. Maintenance nevertheless needs to consider the complete interconnected system. Solar4you also services installations built by other contractors and offers long-term maintenance agreements.
Inspections of newly acquired maintenance clients can reveal defects even where an installation has previously passed an audit. It therefore makes sense to have a qualified professional check proper earthing and electrical safety as well.
Batteries require particular attention to actual environmental conditions and the manufacturer’s operating temperature limits. Pihel describes a case in which a battery in a cold garage shut down at around –15 °C. It was successfully restored, but the incident illustrates that charging and discharging limits can differ substantially.
MarkeDroid Project Manager Sander Õispuu likewise stresses that battery quality and internal controls affect reliability. A battery that repeatedly shuts down cannot contribute to energy optimisation, and the expected savings or additional revenue may be replaced by unexpected costs.
Smart energy management requires reliable devices and communication
Solar4you works with MarkeDroid, whose energy management software helps manage solar plants and battery systems in response to electricity prices. Automated control is only effective when inverters, batteries, consumption meters and network connections provide accurate data.
If communication is lost, a device stops responding or measurements are incomplete, management software cannot make equally informed decisions. MarkeDroid’s diagnostics allow partners to review information across manufacturers and investigate whether an issue is caused by a power outage, a tripped protection device, battery temperature or loss of communication.
Connectivity problems may even stem from routine changes such as replacing a router or an unstable Wi-Fi network. For larger battery installations where uptime is particularly important, Solar4you has also implemented redundant data connections so a failure of one link does not interrupt the entire system.
Preventive maintenance therefore supports safe, reliable operation and helps smart energy management deliver its intended benefits. Solar4you reminds clients about required maintenance, while the owner is ultimately responsible for keeping the installation in proper condition.
Would you like to check the condition of your solar power system?
Explore Solar4you’s solar power system maintenance service and send a maintenance enquiry. We inspect rooftop and ground-mounted installations and provide a written report of our findings.
Based on the article published by MarkeDroid on 9 November 2026. Original author: Evelin Puusepp (MarkeDroid). Adapted and republished with permission. Read the original article in Estonian. Photograph: Solar4you.
