Guide
The inverter is the part that wears out
Panels are warranted for decades and mostly behave. The inverter is the electronic component doing the work, it keeps a record of everything that has gone wrong, and it is the single most useful thing on a solar system to look at.
There is very little routine maintenance a homeowner performs on a solar inverter, and that is by design — it is a sealed piece of power electronics, not a boiler. What there is: keep an eye on production, keep the area around it clear and ventilated, notice error indications instead of ignoring them, and keep the monitoring account in your own name. The real information lives in the inverter's recorded fault history, which almost no owner ever sees, and which tells you more about a system's condition than anything visible from the ground.
What an owner can safely keep an eye on
All of this is done from an app, a screen or a few feet away. None of it involves opening anything.
Production, month against month
The clearest signal there is. A system that made 900 kWh last April and 600 this April is telling you something, and the app already has both numbers.
Status lights and app warnings
Manufacturers use lights and app notifications to say the system is in a fault state. An amber or red indication that has been there for weeks is not decoration.
Airflow and surroundings
Inverters shed heat and derate when they can't. Storage stacked against one, a shrub grown across the vents or a garage that has filled up around it are real and easily fixed causes of lost output.
Noise and smell
A new buzz, a fan running constantly, or any burning smell is a stop-and-call signal — not something to investigate yourself.
The fault history is the actual record
This is the part of a solar system that no visual inspection reaches, and it is where the history is.
Inverters record faults with timestamps and keep them, often for years. That record is the closest thing a solar system has to a service history — and unlike a service history, it cannot be tidied up before a sale.
What tends to be in it: arc-fault detections, which the system is required to look for and which point at a connection problem somewhere in the DC wiring; isolation and ground faults, which usually mean moisture or damage has found its way into the array; grid and voltage faults, which are often the utility's side rather than the system's; over-temperature events, which point at ventilation or placement; and communication failures, which are why monitoring data has gaps.
One isolated fault three years ago is noise. The same fault forty times in the last two months is a condition, and the difference between those two readings is the entire value of looking. A pattern also tells you something a snapshot cannot: whether a problem is getting worse.
Most owners never see any of this, because reaching it usually means a service interface rather than the consumer app. It is a standard part of what we look at — along with the measurements and the physical condition — and it is often the finding that explains everything else.
Inverters don't last as long as panels
Modules and inverters are warranted on completely different timescales, and that mismatch is the single most useful thing to understand about the economics of an older system. Module warranties commonly run for decades. Inverter warranties are shorter — and the specifics vary by manufacturer, product and the terms in force on the day that system was sold, which is why we won't publish a number here and call it universal.
Check the actual document rather than a rule of thumb. The warranty that matters is the one issued with that inverter, and it may have been extended, registered, transferred, or voided by work done since. On a system approaching the end of its inverter warranty, the ownership question and the condition question stop being separate: whoever owns the system when the inverter fails owns the replacement.
In a transaction that becomes a concrete, answerable question rather than a vague worry. How old is the inverter, what does its own paperwork say, what does its fault history look like, and does the warranty follow the equipment to the new owner or stay with the person who bought it?
Common questions
Does a solar inverter need servicing on a schedule?
Not in the way a furnace does. There is no routine owner-performed service on a modern string inverter or microinverter beyond keeping it ventilated and paying attention to what it reports. Where a manufacturer does specify something — a filter, a periodic check, a registration step to keep a warranty alive — it is in that product's own documentation, and that document is the authority, not a generic maintenance schedule.
Should I update the firmware?
That is a decision for whoever holds the manufacturer relationship, not something to do casually. A failed update can leave a system offline. We record the version and whether an update is outstanding; we don't apply them as part of an inspection.
The app says there's an error but the system seems fine. Does it matter?
Often yes. Plenty of faults reduce output without stopping it — a single string offline, a derating condition, one microinverter that has stopped reporting. The system looks like it's working because it is working, just not as much as it should. That is precisely the failure that goes unnoticed for years.
Can you replace an inverter for us?
No. We inspect and document; we don't sell or install equipment. If an inverter is at the end of its life we'll say so and explain what we saw, and we'll help you read a quote you've been given. Choosing the contractor is yours.
Is the inverter's condition part of a standard inspection?
Yes. Inverter diagnostics, the recorded error history, firmware version and update status, monitoring and connectivity are all part of what we evaluate where applicable — site conditions and equipment vary, and no inspection performs every test on every property.
Working a weekend transaction? So are we
The office is open Monday–Friday 9am–6pm, but inspections run on weekends and requests are open around the clock. We'll call to confirm the date and time.
Requesting an inspection isn't a confirmed appointment — we'll contact you to confirm timing.