Solar panels have become an increasingly popular way for homeowners to generate clean and renewable energy. While solar panels require minimal maintenance, it's essential to understand what's involved to keep your system operating at peak efficiency for its full lifespan.
How Long Do Solar Panels Last?
Quality solar panels from reputable manufacturers are rated to last at least 30 years at or above 80% of their original performance. Many systems continue to function well beyond this, with some degradation over time but still generating useful electricity.
The key components and their typical lifespans:
- Solar panels: 25–30+ years
- Inverter: 10–15 years (may need replacement during system life)
- Mounting hardware: 25+ years, matching the panels
- Wiring and connections: 25+ years when properly installed
Solar Panel Maintenance Requirements
Cleaning
In most New Zealand locations, rainfall is sufficient to keep panels reasonably clean. However, in areas with heavy dust, pollen, bird droppings, or nearby industrial activity, more frequent cleaning may be needed. A gentle rinse with water (ideally early morning or evening when panels are cool) is usually sufficient. Avoid abrasive cleaners or harsh chemicals.
Inspection
An annual inspection by a qualified installer is recommended. This should include:
- Visual inspection of panels for cracks, hot spots, or discolouration
- Inspection of mounting hardware and roof penetrations
- Checks on electrical connections and wiring
- Review of inverter performance data and any fault codes
Monitoring
Modern solar systems include monitoring apps that allow you to track your system's daily and historical production. Regularly reviewing your monitoring data is the easiest way to detect if your system's performance is below expectations — which could indicate a panel issue, shading problem, or inverter fault.
What Can Go Wrong?
While solar systems are generally reliable, common issues include:
- Inverter faults: Inverters are the most common component to require attention. Many issues can be resolved remotely via the monitoring system.
- Soiling losses: Dirty panels can reduce output by 5–15%. Regular cleaning restores full performance.
- Shading changes: Trees or new structures that cast shade on your panels will reduce output. Trimming trees or adjusting system design can help.
Warranties to Look For
- Panel performance warranty: Should guarantee at least 80% output at 30 years
- Panel product warranty: 10–15 years covering manufacturing defects
- Inverter warranty: 5–10 years (extendable with some brands)
- Installation workmanship warranty: At least 5 years, covering installation quality
Keep Your System Performing
EFS Solar provides ongoing support for all systems we install. If you notice a drop in production or have concerns about your system, contact our team for assistance.