The widespread adoption of solar energy in Australia is a testament to our commitment to a sustainable future. However, as more homes embrace solar power, a new challenge has emerged: solar and internet interference, specifically with the National Broadband Network (NBN).
This post will guide you through understanding and overcoming NBN interference caused by solar equipment, ensuring your home enjoys both renewable energy and reliable internet. At Energy Matters, we believe in maximising your home’s efficiency.
Understanding solar and internet interferences: What’s going on?
Many homeowners in Australia experience NBN drop-outs or slow speeds when solar inverters emit electromagnetic or radio-frequency interference. These solar and internet interferences often stem from low-grade inverters that lack proper shielding or compliance. In some cases, the wiring inadvertently acts like an antenna, transmitting noise that disrupts Wi-Fi or broadband signals.
Pinpointing the culprits: Sources of interference
Several components in a solar power system can contribute to NBN interference. Identifying these sources is the first step towards a solution.
DC isolators and wiring
The cables carrying DC power from your solar panels to the inverter, as well as the DC isolators used for safety, can also act as antennas, radiating electromagnetic noise. Poorly shielded or ungrounded wiring exacerbates this issue.
Power optimisers
While enhancing panel performance, power optimisers can sometimes contribute to Electromagnetic Interference (EMI), particularly if they are not designed with sufficient electromagnetic compatibility (EMC) in mind.
Switch-mode power supplies
Many ancillary solar components, including monitoring systems, utilise switch-mode power supplies that can generate high-frequency noise, impacting NBN signals.
Solar inverters
These crucial devices convert DC power from solar panels into AC power for your home. Both string inverters and microinverters can emit EMI if not properly shielded or installed.
Why solar inverters can disrupt broadband: The technical details
- RF noise propagation: Low-grade inverters can generate radio-frequency interference that travels through wiring and radiates out. Those wires—and even solar panels—act like unintended antennas.
- Non-compliance with EMI standards: Older or cheap inverters may lack RCM certification and fail to meet electromagnetic interference (EMI) requirements in Australia.
- Nearby wiring issues: Some installers blame proximity to telecom cables or poor internal wiring; however, inspections often reveal compliant cabling, but still, interference persists.
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Diagnosing solar and internet interferences
Before implementing solutions, it’s essential to confirm that your solar system is indeed the cause of your NBN issues.
- Isolate the issue: Observe when the NBN interference occurs. Does it coincide with your solar system’s operation (e.g., during daylight hours)?
- Turn off solar: Temporarily shut down your solar inverter and any associated components. If your NBN service improves significantly, your solar system is likely the culprit.
- Check other devices: Rule out other potential sources of interference in your home, such as faulty appliances, dimmer switches, or older electronic devices.
- Use simple tools: An AM radio near the inverter can reveal buzzing noise indicative of RF interference.
- Consider ferrite chokes or filters: Though some users report limited success, these can reduce noise travelling along cables.
- Consult an expert: For complex cases, a qualified solar electrician or an NBN technician can perform detailed diagnostics using specialised equipment to pinpoint the exact source and frequency of the interference.
Effective strategies to overcome NBN interference
Once the source is identified, several strategies can be employed to mitigate or eliminate NBN interference from your solar equipment.
Improving installation practices
Proper installation is paramount in preventing EMI.
- Shielded cabling: Use high-quality, shielded DC and AC cabling throughout your solar system. This helps contain electromagnetic radiation within the cables.
- Proper grounding: Ensure all components of your solar system are correctly grounded in accordance with Australian standards. Adequate grounding provides a path for stray currents and reduces EMI.
- Cable routing: Separate power cables from data or NBN lines to prevent inductive coupling. Cross cables at right angles when necessary, rather than running them parallel to each other.
- Ferrite cores: Install ferrite cores on DC cables near the inverter and panels. These devices can absorb high-frequency noise and reduce its propagation.
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Upgrading or replacing components
Sometimes, older or lower-quality components are the primary source of interference.
- EMC-compliant inverters: Invest in solar inverters that are designed explicitly with strong electromagnetic compatibility (EMC) features. Look for inverters certified to relevant Australian and international EMC standards.
- Microinverters vs. String inverters: While both can cause interference, modern microinverters often have better-integrated EMC measures due to their decentralised nature. Discuss the pros and cons with your solar installer to make an informed decision.
- Quality power optimisers: If using power optimisers, ensure they are from reputable manufacturers with proven EMC performance.
Filtering and shielding solutions
For current systems, adding filters and extra shielding is a practical way to boost security.
- Line filters: Install AC line filters on the output of your solar inverter to suppress high-frequency noise before it enters your home’s electrical grid.
- Enclosures and shielding: Ensure all electrical enclosures are properly sealed and, if necessary, consider adding internal shielding to inverter cabinets.
- NBN signal boosters/filters: In some cases, NBN technicians might recommend specific filters or signal boosters for your NBN connection to improve its resilience against external interference.
Optimising NBN equipment placement
The physical proximity of your NBN equipment to your solar components can also play a role.
- Relocate NBN modem/router: Moving your NBN modem and Wi-Fi router further away from your solar inverter and main solar wiring. Even a few meters can make a difference.
- External antennas: For NBN fixed wireless or satellite connections, ensure external antennas are optimally placed, away from solar panels or inverter units, and are properly aligned.
- Use NBN troubleshooting tools: Power cycle your NBN connection box, swap Ethernet cables, and rule out other causes. These steps can help verify if the problem stems from solar equipment or general broadband issues.
The role of regulatory standards
Australia has robust regulatory frameworks in place to manage electromagnetic compatibility. Equipment sold in Australia must comply with ACMA (Australian Communications and Media Authority) standards for EMC. Always ensure your solar equipment is certified to these standards. Choosing reputable brands and installers who prioritise compliance is key to minimising potential interference.
When to call in the experts
If basic checks don’t resolve issues, escalate your case:
- Contact your ISP or NBN provider with logs of drop-outs, inverter operation times, and any test results.
- Reach out to ACMA if you suspect equipment is non-compliant—this regulator enforces EMI standards on solar devices.
- Bring in an electrical safety officer to confirm internal wiring isn’t the culprit.
Summary table: Quick guide to tackle solar-NBN interference
| Issue | Action |
| Buzzing or disruptions | Turn off the inverter to test |
| RF noise detected | Use an AM radio to isolate the source |
| Outdated inverter | Replace with RCM-approved, low-EMI model |
| Poor cable layout | Re-route inverter wiring, improve grounding, and distance from NBN |
| NBN issues persist | Power cycle the NBN box, test Ethernet, and contact the provider |
| Regulatory concerns | Contact ACMA for possible non-compliance |
Sources: Regional Tech Hub – nbn® Fixed Wireless connectivity guide | nbn Co Limited – nbn Fixed Wireless Troubleshooting Guide | Australian Government, ACMA – Interference and licensing compliance: solar inverters report
Tackling solar and internet interferences
Achieving a harmonious balance between your solar power system and your NBN internet connection is entirely possible. By understanding the potential sources of interference, applying appropriate mitigation strategies, and partnering with experienced professionals, you can enjoy uninterrupted, high-speed internet and the benefits of renewable energy.
Going solar with confidence
Energy Matters is here to guide you every step of the way. We help Australian home and business owners receive personalised solar quotes through our large network of high-quality solar installers. We only work with reputable solar companies that have a proven track record of delivering high-quality solar systems.
Let Energy Matters help you harness the sun’s power for a greener tomorrow. Explore the range of solar landscape lighting, garden solar systems, and eco-friendly products at our Energy Matters Marketplace, which features solar panels, energy storage solutions, and energy-efficient appliances. Start your journey towards a more sustainable and eco-friendly outdoor living experience today.
