Summary:
Solar panels in Malaysia can lose up to 25% of their efficiency each year from stubborn dirt and pollution, which rain alone cannot remove. Attempting DIY cleaning often leads to safety hazards or voided warranties, making a professional solar panel cleaning service the safer and more effective choice for most installations. These experts not only restore lost efficiency but also provide the necessary documentation for compliance and warranty protection. Consistent quarterly inspections, hardware checks, and annual inverter reviews are key to keeping systems running at their best. By following a structured and compliant maintenance plan, property owners can protect both their solar investment and regulatory standing.
How Do I Keep Solar Panels Efficient with Regular Cleaning?
Clean solar panels are essential for maintaining peak energy output and maximising return on investment. However, not all cleaning methods are effective — or safe. Only a systematic, professional solar panel cleaning service preserves both performance and warranty, while protecting your asset from damage and regulatory risks.
Why Dirt Steals Your Solar Output in Malaysia
Official data from SEDA Malaysia consistently show that dust, bird droppings, airborne pollution, and organic buildup (such as leaves, plant sap, and biofilm) reduce PV output by up to 25% annually. Losses are most pronounced in areas near main roads, construction sites, and during dry or hazy periods.
Even in Malaysia’s rainy climate, naturally washed panels still collect soiling: sticky residues, organic films, and mineral spots remain after rainfall, contributing to permanent glass degradation if not addressed early.
| Condition | Output Loss (%) | Note |
| Urban dust (dry season) | 8–12 | SEDA Malaysia |
| Organic debris, biofilm | 5–10 | PV Tech/SEDA |
| Construction/industrial areas | 12–25 | SEDA Directory |
| Bird droppings, algae (localised) | Up to 50 | TNB/Field Reports |
Lack of regular cleaning results in ongoing efficiency loss. Over time, this not only reduces yield but can also cause irreversible module damage, especially in Malaysia’s humid, urban environments.
Early-Morning Rinses and Heat-Avoidance Tricks
Cleaning should be scheduled for early morning or overcast conditions to avoid cracking caused by thermal shock. Never clean panels under direct, hot sun — surface temperatures above 60°C can cause water to evaporate instantly, leaving behind minerals and streaks that further degrade performance. Routine rain is insufficient; inspections typically reveal persistent soiling even after heavy storms.
Soft Brushes, Purified Water and No Harsh Soaps
Effective, asset-safe cleaning means using:
- Soft, non-conductive brushes and extendable poles
- Purified (RO or deionised) water, never hard tap or rainwater for final rinse
- No abrasive pads, high-pressure sprays, or strong detergents.
Manual agitation is essential for removing tenacious dirt — rain cannot remove oily, sticky, or biological residues typical in Malaysia.
Step-by-step for safe DIY solar panel cleaning:
- Power down inverters as per the system manual.
- Sweep loose debris away with a soft brush.
- Rinse with purified water using gentle flow.
- Soak stubborn spots before mild, careful brushing.
- Let the panels air dry fully before restarting the system.
DIY vs Professional Solar Panel Cleaning: Cost, Risk & ROI
Choosing between DIY cleaning and engaging a professional solar panel cleaning service company involves balancing cost, safety, and long-term value. Here’s how each option compares for local property owners.
Cost, Safety and Warranty Considerations
Choosing between DIY and a professional solar panel cleaning service? Here’s how the 2 approaches compare:
| Aspect | DIY Cleaning | Professional Service |
| Out-of-Pocket Cost | Low (mostly time, basic tools) | RM250–500/visit (residential);RM0.40–1.20/kWp or RM800–3,000+/visit (commercial/industrial) |
| Safety Risk | High — risk of falls, electric shock | Low — trained, insured crews with proper gear |
| Warranty Impact | May void warranty if done improperly | Maintains warranty if done by certified provider |
| Effectiveness | Variable — depends on owner’s skill | Consistent, thorough, industry-standard |
| Documentation | None or limited | Full service log, supports insurance/compliance |
When Professional Gear Makes the Difference
Professional solar panel cleaning service providers use insulated equipment, purified water systems, and appropriate PPE for all types of rooftops. They also perform post-cleaning inspections, identifying issues beyond simple dirt — such as micro-cracks, hotspots, or shading that can decrease return on investment if left unresolved. Service documentation from registered companies is useful for compliance and warranty records.
Reducing Efficiency Loss in Solar Panels Between Washes
Between scheduled cleaning, certain preventative actions can help maintain system performance — but will not fully replace periodic professional or methodical manual cleaning.
Tilt Adjustments, Bird-Deterrent Strips and Drain Paths
Solar panels should be installed at a minimum tilt of 10–15° to take advantage of gravity-assisted runoff during the country’s frequent rainfall. This tilt reduces dust and standing water, slowing the buildup of soil and organic matter.
Adding bird-deterrent strips or mesh helps prevent birds from nesting underneath panels, which reduces localised soiling and minimises the risk of accumulated organic debris. Regularly check and clear drainage paths — such as panel frames and rooftop gutters — to prevent pooling water, leaf buildup, and algae growth. Blocked drainage accelerates panel soiling, especially during and after the monsoon season.
Monitoring Apps to Spot Performance Dips Early
Modern solar PV systems typically include performance monitoring via app or web dashboard. These tools allow owners and facility managers to review system output in real time and set alerts for below-average generation. This proactive monitoring makes it possible to detect efficiency drops immediately after dust storms, haze episodes, or increased bird activity — long before losses become substantial.
If output remains lower than expected after rainfall or overcast periods, this signals that manual or professional cleaning is needed. Performance data from these apps can be referenced during maintenance checks, and documented evidence of regular monitoring may be useful for warranty and compliance purposes.
Routine Solar Panel Maintenance Checklist for Long-Term Gains
Cleaning is just one aspect of effective solar care. Northern Solar as a company provides professional solar panel cleaning service, maintenance routine should be done. A regular, structured maintenance routine safeguards both system performance and compliance over the years.
Quarterly Visual Inspections and Torque Checks
Conduct visual inspections every 3 months. Look for uneven soiling, leaf or debris accumulation, bird nests, cracked glass, and signs of corrosion or water ingress, especially after the monsoon. Quarterly torque checks on panel mounts, clamps, and hardware are recommended. Loose fastenings are a frequent cause of module misalignment or damage, particularly after heavy downpours and strong winds.
Annual Inverter Logs and Firmware Updates
Download and review inverter logs at least once per year to identify output irregularities and recorded faults, which may indicate soiling or hidden technical problems. Keeping inverter firmware updated is important for long-term reliability, system optimisation, and access to the latest remote monitoring or alerting functions. Annual reviews and software updates are also usually required for warranty compliance and to maintain eligibility for government incentives.
Want Efficient Solar Energy Without the Hassle? Book Northern Solar’s Specialist Service
For both residential and commercial rooftops, cleaning and scheduled maintenance are essential for reliable performance and regulatory compliance. Natural rain cannot replace professional solar panel cleaning or system checks. A structured maintenance programme ensures output, warranty protection, and audit-ready documentation.
Northern Solar, as an EPCC company, offers solar panel cleaning service, inspection, and maintenance plans tailored to your property’s requirements. Contact our team today to arrange a compliant maintenance schedule or get a quote.
