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Solar inverter screen showing an error code

Troubleshooting · Phoenix, Arizona: Solar panels not working? How to check.

Most solar systems work as promised. If you're not sure yours does, run these five quick checks before you call anyone. They'll tell you fast whether something is off.

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Five checks before you call a technician

Work through these in order. If any of them looks wrong, that's your sign to bring in a professional.

  1. 1Weather and inverter
  2. 2Meter and bill
  3. 3Your installer
  4. 4Call a pro
  1. 01 · Checks 1 and 2

    Look at the weather and the inverter

    Clouds explain a small dip. Your inverter's lights explain a lot more.

    • Cloudy days are normal

      Panels make about 10 to 25% of their capacity in cloudy or rainy weather. A stretch of overcast days can show up in your app.

    • It's not a big dent

      A cloudy spell usually doesn't make a huge dent in your monthly bill.

    • Green light

      The inverter is the brain of the system. Green status lights usually mean everything is fine.

    • Orange or red light

      The system has almost always flagged a problem. That's the time to call a professional.

    Inverter screen showing an error code
  2. 02 · Checks 3 and 4

    Check your solar meter and power bill

    Your meter and your bill are the earliest, cheapest signals of a bigger issue.

    • Solar meter trend

      The meter tracks production. If kilowatt-hours trend down month over month, get the system inspected.

    • Your power bill

      Per SunRun, "Going solar can significantly reduce or eliminate your electric bill."

    • Paying much less?

      You should be paying much less than before solar, or getting credits for extra energy.

    • Neither one?

      If you're not seeing lower bills or credits, something is off.

    Arizona home with rooftop solar panels
  3. 03 · Check 5

    Call the company that installed it

    Ask your installer to verify the setup.

    • Ask them to check it

      The installer can usually see your system's production data.

    • Slow to respond?

      If they're slow or unresponsive, get a second opinion from another company.

    • Out of business?

      Many installers have shut down. SolarFIX works on systems installed by other companies every day.

    • Get a second opinion

      A fresh set of eyes is often the fastest way to an answer.

    Rooftop solar panels under a partly cloudy sky
  4. 04 · When to call

    Bring in a professional

    Any check came back wrong? That's the moment to call SolarFIX.

    • Red inverter light

      The system isn't producing normally.

    • Dropping kWh trend

      Production is sliding month over month.

    • Higher bill

      Your bill climbed with no other explanation.

    • Installer gone dark

      Nobody is answering for your system.

    Our solar panel inspection is designed for exactly this.

    Technician testing a rooftop solar system

Testing a panel

Can you test a solar panel yourself?

Click through what's involved, and why most homeowners book an inspection instead.

The method · 1/5

Use an amp meter

Per Solar Feeds, you can attach an amp meter to the positive and negative terminals to measure a panel's output wattage and voltage.

Call SolarFIX if

Any check came back wrong

  • Your inverter shows an orange or red light
  • Your kWh trend is dropping month over month
  • Your power bill is unexpectedly high
  • Your installer has gone dark or closed

Stay safe

Leave these to a pro

  • Opening the inverter enclosure
  • Testing panels with a meter on a live DC system
  • Climbing on the roof to inspect panels
  • Touching wiring or connectors
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What we can help with

What each check tells you

A quick reference for the five checks, plus where to go next.

01

Weather

10 to 25% of capacity on cloudy or rainy days is normal. A persistent drop on sunny days is not.

02

Inverter

Green usually means fine. Orange or red almost always means the system flagged a problem.

03

Solar meter

A downward month-over-month kWh trend is the earliest sign of a bigger issue.

04

Power bill

You should be paying much less, or getting credits. If neither, something is off.

Questions

Frequently asked

How do I know if my solar panels are actually working?

The fastest checks are your inverter status lights (green good, orange or red bad), your monitoring app trend, and your utility bill. If any of the three looks wrong, escalate.

Can I test panel output myself?

Per Solar Feeds, you can use an amp meter attached to the positive and negative terminals to measure panel output wattage and voltage. Doing it safely requires knowing what you're looking at on a live DC system, so most homeowners are better off booking a professional inspection.

What's a normal production drop on a cloudy day?

Panels typically produce 10 to 25 percent of their rated capacity in cloudy or rainy conditions. A single overcast day isn't a problem; a persistent drop across sunny days is.

My inverter light is red. Is it broken?

Not necessarily. It could be a fault that clears itself, a wiring issue, an arc-fault trip, or a failed component. Either way, it means the system isn't producing normally and needs a technician. Don't open the enclosure yourself.

My installer is out of business. What now?

See our guide on what to do when your solar company goes out of business. SolarFIX services systems installed by other companies every day.

Installer out of business?

If the company that installed your system is gone, our orphaned-system guide walks you through what to do. SolarFIX services systems installed by other companies every day.

Read the orphaned-system guide →

Get your system back producing.

Call SolarFIX or send a request. We'll run a real diagnostic and tell you exactly what's going on. Licensed, bonded and insured, AZ ROC #323541.

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