Solar inverter health check across Townsville.
Most Townsville string inverters from the 2012-2017 FiT boom are now at or past their 10-year design life. Heat-derating, capacitor degradation, intermittent isolation faults — all completely normal failure modes that often go unnoticed until output drops sharply. Our CEC-accredited health check runs the diagnostics before failure becomes a problem.
What an inverter health check covers.
String inverter vs micro-inverter.
Townsville’s installed base splits roughly 80/20 between string inverters (one or two central units handling all the panels — Fronius, SMA, Sungrow, Aurora, Goodwe) and micro-inverters (one small inverter per panel — predominantly Enphase, with some early SolarEdge power-optimiser systems). The health-check procedure is fundamentally different for each, and we cover both. For string inverters we look at central health, fan operation, capacitor state and MPPT tracking. For micro-inverters we pull the per-panel telemetry to identify under-performing or failed units.
DC isolator test — the fire-risk one.
The rooftop DC isolator is the single highest fire-risk component on a residential solar system. The 2009-2014 generation of DC isolators (a number of brands had documented failure modes including water ingress and arc-flash) is still present on the majority of Townsville installs of that era. Our health check includes a full DC isolator operational test, visual inspection for water ingress, terminal-block torque check, and a thermal-imaging scan under load. Any isolator showing arc damage, heat marks or moisture is flagged immediately — this is a same-day fix-or-isolate item.
Error-code download + firmware update.
Modern inverters log every fault to internal memory. We connect to the inverter via Wi-Fi or RS485 and download the full error-code log, identifying recurring faults like AC voltage excursions (common in Townsville’s long radial-feed network), DC isolation faults (often water-related), and grid synchronisation losses. While connected we update the firmware to the latest manufacturer release — many older installs are 3-5 firmware versions out of date and missing significant efficiency and safety patches.
Summer heat-derating — Townsville-specific.
String inverters de-rate their output once internal temperature exceeds the spec ceiling (typically 45-55°C). In a Townsville summer the inverter housing — usually mounted against a north-facing wall or in a garage — can reach 60-70°C, forcing the inverter to cut output by 15-25% from December through March. We check actual internal temps against spec ceiling and recommend ventilation improvements if significant derating is happening. On the worst cases we’ve seen a re-mount or shade-canopy install recover several hundred dollars per summer in lost FiT income.
AS/NZS 3000 + AS/NZS 4777 compliance scan.
A visual + electrical compliance check against AS/NZS 3000 (Wiring Rules), AS/NZS 4777 (Inverter Grid Connection) and AS/NZS 5033 (PV Array Installation). Common findings on older Townsville installs: missing or faded labelling, cable degradation on the DC side, earth-bond continuity issues, and inverter AS/NZS 4777 software settings that don’t meet the current Ergon Energy connection requirements (Ergon updated the standard settings several times since 2014).
Pricing.
- Standard string-inverter check (Fronius, SMA, Sungrow, etc): $80–$140
- Two-inverter system or larger: $120–$180
- Micro-inverter system with full telemetry pull (Enphase): $140–$220
- Bundled with annual panel clean: combined discount
Reported in writing with full error log, firmware version, isolator state, derating measurement and AS/NZS 4777 compliance status. Suitable for warranty and insurance documentation.
Where we work.
Book your inverter health check.
CEC-accredited. DC isolator + error log + firmware + heat-derating. Bundle with a clean for best price.