A Bendigo solar inverter fault is urgent only if it trips, smells or shows an earth fault
A red inverter light, no production or app warning can mean anything from a free Wi-Fi reset to a $3,800 inverter replacement. If there is burning smell, heat, water, repeated tripping or an isolation fault, leave the solar off and book a same-week repair. If only the phone app is offline, check Wi-Fi first.
Solar inverter fault triage table
Use this as a kitchen-table guide, not a licence to work inside solar gear. Anything involving DC wiring, rooftop isolators, inverter covers or switchboard work belongs with a licensed electrician and solar-accredited technician.
| Symptom | Likely cause | How urgent | Likely repair cost |
|---|---|---|---|
| Monitoring app offline, inverter screen normal | Wi-Fi password changed, router moved, dongle disconnected | Not urgent. Try self-checks first. | $0-$220 |
| Red light or no production in daylight | Inverter fault, grid fault, failed AC breaker, firmware issue | Same week if still stopped after restart. | $180-$650 diagnostic, $1,900-$3,800 if replacement |
| Isolation fault or earth fault message | Water in DC connector, damaged cable, failed isolator, panel fault | Same week. Leave solar off. | $350-$1,400 typical, more if cable replacement is long |
| Breaker trips when solar starts | AC fault, inverter fault, moisture, overloaded circuit | Same week. Do not keep resetting. | $250-$1,200, or inverter replacement if internal fault |
| Output down 10 percent in dusty months | Dust, pollen, smoke haze, seasonal sun angle | Can wait. Check over clear days. | $0-$450 for clean, no electrician usually needed |
| One string or half the array missing | String fault, optimiser issue, failed panel, connector fault | Book within 2 weeks. | $280-$1,200 depending on tracing time |
| Burning smell, melted isolator, visible heat damage | Electrical failure or water damaged DC equipment | Urgent. Turn solar off if safe and call. | $450-$1,800, sometimes more with rewiring |
| Retailer bill shows no feed-in credit | Meter not configured, retailer issue, export limit, billing delay | Not a roof emergency. | $0-$300 admin, meter costs vary |
Start with the symptom, not the scare story
Solar systems fail in a few common ways. The inverter is the obvious box, so it gets blamed for everything, but the cause can be outside the inverter. Bendigo homes see plenty of dust, hot summer roof temperatures, winter mornings near freezing, and older tile roofs with roof penetrations that have been through years of expansion and contraction. That can show up as water in DC connectors after rain, brittle isolators, app communication dropouts or inverter heat faults in January.
If your monitoring app says the system is offline but the inverter display shows normal production, there may be no electrical fault at all. Changed NBN routers, new Wi-Fi passwords and weak garage Wi-Fi are common. Restart the router, check the inverter app instructions, and give it 15 minutes. Paying $180-$280 for someone to press the same settings is unnecessary unless the inverter will not reconnect or you need monitoring restored for warranty evidence.
If the inverter screen says "isolation fault", "earth fault", "ground fault", "PV insulation low" or similar, treat it differently. That can indicate moisture or damaged insulation on the DC side. Solar DC is not the same as unplugging a kettle. Panels can produce voltage whenever daylight hits them. Do not open covers, do not unplug rooftop connectors, and do not keep toggling isolators hoping it clears. Book solar repair and leave the system off if that is the labelled safe state.
What you can safely do yourself
You can look, record and reset within labelled homeowner controls. Write down the exact fault wording, inverter brand, time of day, weather and whether the breaker tripped. Take photos of the inverter screen and switchboard from the floor. Check whether the app shows a Wi-Fi or server error rather than a production error. Check a recent sunny day against another sunny day in the same season, not against December output during a cloudy July week.
You can also use your bill as a clue. If the system shows normal generation but your bill has no feed-in credit, the issue may sit with the retailer, meter setup or Powercor export approval rather than the panels. See the Bendigo grid connection guide before paying for a roof fault visit. If the inverter has produced nothing for several clear days, then the repair visit is justified.
Do not climb on the roof, touch DC isolators on the roof, remove inverter covers, open the switchboard, hose panels from a ladder or bypass a breaker. The cheap option is not worth a fall or an electrical injury. If the system is old and dirty but working, a normal panel clean can wait for a dry, mild week. If it is showing a safety fault, cleaning is not the fix.
Send the exact fault wording before booking
A photo of the inverter screen often saves a wasted visit and helps price the job before a technician leaves Bendigo.
What can wait a season
A small output drop in late autumn or winter can be normal. Bendigo winter days are shorter, the sun angle is lower, and fog or cloud can make a strong system look ordinary. If your 6.6 kW system made 35 kWh on a clear December day and only 15 kWh on a mixed July day, that is not automatically a fault. Compare against similar weather, not against peak summer.
Panel grime can also wait unless the panels are heavily soiled by bird droppings, lichen or construction dust. A light layer of Bendigo dust may trim output but rarely justifies an urgent electrical call-out. Book cleaning or inspection when it is safe and dry. If one string is missing, one panel is visibly shattered, or a fault appears after rain, move it up the list.
Old inverters can limp along for months with occasional communication warnings. That does not mean ignore them forever. If the inverter is 9-12 years old, make a replacement plan before summer heat pushes it over the edge. A planned replacement is less stressful than a dead system during a run of 35°C days when your air-con load is high.
When a replacement beats a repair
Repair is sensible when the fault is outside the inverter, the unit is under warranty, or the fix is a small part and one visit. Replacement is usually better when the inverter is out of warranty, the quoted repair is more than $600-$1,000, or the system already needs changes for a battery or EV charger. A new inverter can improve monitoring, comply with current grid settings and give a fresh warranty.
If you plan to add storage, ask whether the replacement should be hybrid or whether an AC-coupled battery makes more sense. The answer depends on your existing panels, single-phase or three-phase supply, Powercor export limit and backup needs. The battery sizing guide is worth reading before you spend money on an inverter that boxes you in later.
This business does not sell a repair visit when the issue is clearly a billing delay, app password problem or normal seasonal drop. We will say that plainly. The paid visit is for electrical faults, dead hardware, safety concerns, warranty evidence, system recommissioning or cases where the homeowner cannot safely confirm the cause.
Clues that help price the repair before anyone visits
The most useful clue is the exact wording on the inverter, not a summary like "it is broken". Different brands use different messages, but the words usually point in a direction. "Grid voltage" can mean the inverter is protecting itself because the street voltage is high. "No grid" can point to an AC breaker, meter or supply issue. "Insulation" or "isolation" usually points to the DC side and needs more care. A clear photo saves time and often changes the first quote from vague to useful.
The second clue is weather. If the fault appears only after rain, suspect water ingress, damaged connectors, a rooftop isolator or cable insulation. If it appears only on very hot days, suspect inverter heat, ventilation or an ageing internal component. If it appears every morning then clears, the issue may be moisture, grid voltage, startup behaviour or a weak component. Bendigo’s hot dry summers and cold winter mornings make timing useful evidence, not trivia.
The third clue is system age and install history. A system installed before current standards may still be legal for its time, but replacement parts and safety expectations have moved on. If the home was bought with solar already installed, look for handover documents, the old Certificate of Electrical Safety, inverter warranty and app login. If none exist, a safety inspection may be a better first step than a narrow repair because it gives you a baseline for the whole system.
The fourth clue is whether the house has changed. New internet, a switchboard upgrade, a battery retrofit, an EV charger, a smart meter change or retailer switch can all create symptoms that look like inverter failure. Tell the technician what changed in the last 30 days. If the only issue started the day after a new router was installed, spend 10 minutes on Wi-Fi before paying for a roof fault search.
Get your inverter fault triaged
Send a photo of the fault screen and your suburb, and we will reply within 1 business day with urgency, likely cause and cost range.