Inverter Repair & Replacement in Tucson, AZ

Inverter Repair & Replacement is one of the most common solar repairs in Tucson, since the inverter is often the real culprit when production drops. Panels make direct current; the inverter turns it into the alternating current your house and the grid use. It runs every sunny day, it handles all of the system's power, and in a typical home it hangs on an exterior wall or sits under the array where summer heat bakes it. When it fails, production does not just slip. It often stops.

Why inverters fail

Most inverters rely on electrolytic capacitors, and those parts have a life expectancy on the order of a decade, shorter when they run hot. Tucson's average daily highs top 100 degrees in June and July, and an inverter on a south or west wall in direct sun runs hotter still. Fans in larger units pull in dust, and dust is everywhere here between monsoon storms. Voltage surges, loose connections and plain age account for much of the rest.

Which kind do you have?

• String inverter. One box, usually on a wall near the electric meter, with panels wired to it in series. If it fails, the whole system stops. Warranties are often 5 to 10 years, so many older Tucson systems are past coverage.
• Microinverters. A small inverter under each panel on the roof. One failure takes out a single panel, not the whole array, and warranties typically run 15 to 25 years. The catch is that every replacement means a trip onto the roof and, often, lifting the panel.
• Power optimizers. A box under each panel that tunes its output, plus a central inverter on the wall that still does the conversion. Faults can sit in either place.

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Repair or replace?

Some problems are fixable without new hardware: a tripped breaker or disconnect, a loose or corroded connection, a communication fault, a firmware issue or a failed fan. Others mean the unit has reached the end of its life. When a string inverter is past warranty, we lay out what a replacement costs and whether a newer unit, or a switch to microinverters or optimizers, makes sense for your roof and shading. If the unit is still under warranty, we gather the serial numbers and error logs and help you file the claim. Manufacturer warranties often cover the part but not the labor to swap it, so ask about both.

Utility paperwork

TEP says a new interconnection application is required if you add panels or another inverter, and the system must wait for Permission to Operate before it is turned back on. A same-size, like-for-like swap is usually simpler, but we confirm what your utility and permit office need before the old unit comes off the wall. Trico members follow Trico's own process. Either way, those steps are on your schedule and your quote.

Protecting the new unit

Where the layout allows, a replacement inverter can go in a shadier spot, on a north-facing wall, under an eave or in a carport, which helps keep it cooler through the summer. We also check that the disconnects, breaker and conduit are in good shape, because a new inverter on old, sun-cracked wiring is a repeat call waiting to happen.