Solar Breaker Keeps Tripping? What It Means and What to Do
A breaker that trips once is doing its job. A solar breaker that keeps tripping is telling you something in the system needs a closer look. Here's how to read the signs and what to do next.
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The short answer
A breaker trips to protect the wiring behind it. One trip after a storm or a utility outage can be a one-off. A solar breaker that trips again and again is a sign of a problem, and the fix is finding the cause, not flipping the switch back on every morning.
The Electrical Safety Foundation puts it plainly: frequent trips of a breaker indicate a problem and should be inspected by a qualified electrician. That applies to your solar circuit as much as any other.
First, figure out which breaker tripped
"The solar breaker" can mean a few different things, and it helps to know which one you're looking at before you call anyone.
- ▸The solar breaker in your main panel. Most systems have a labeled AC disconnect or a solar breaker in your main electrical panel. This is the breaker that connects your solar to the house.
- ▸A disconnect switch near the meter or inverter. Many systems also have a separate disconnect outside. If the handle is off or tripped, note that too.
- ▸A house circuit, not the solar. Sometimes the breaker that keeps tripping is the AC compressor, the pool pump, or a kitchen circuit that happens to sit next to the solar breaker. That's an electrical problem, but not a solar one.
Take a photo of the panel with the tripped breaker in it. The labels and the breaker size printed on the handle tell a technician a lot.
Why a solar breaker trips
The Electrical Safety Foundation describes three main reasons a breaker trips, depending on the type:
- ▸Too much current. A standard breaker trips when an electrical current exceeds levels determined by the breaker's ratings.
- ▸An arc fault. An AFCI breaker trips when a parallel arc between the hot and neutral conductors is detected.
- ▸A ground fault. A GFCI breaker trips when an unwanted path occurs between an electrical current and a grounded element.
On a solar system, the usual causes behind those trips include a failing inverter or microinverter, a loose or corroded connection, wiring damaged by heat, sun or animals, or a breaker that has simply worn out. A system that was added onto or modified without a permit can also have breaker sizing problems. You won't know which one it is from the panel door, and that's fine. Your job is to give the technician good information.
What you can safely check yourself
You don't need tools for any of this, and you shouldn't open the panel cover or the inverter.
- ▸Write down when it trips. Note the date, time, and weather. Trips that happen at midday on hot, sunny days point in a different direction than trips at night or during a storm.
- ▸Check your monitoring app. Look for alerts, error codes, or a sudden drop in production around the time of the trip.
- ▸Look at the inverter screen or status lights. Take a photo of any error code.
- ▸Use your senses from a distance. The CPSC's guide to home wiring hazards notes that parts may be warm but should never be hot-painful to touch or discolored from heat, and that burned or overheated wires often give off an odor of hot insulation.
If you notice a burning smell, scorch marks, buzzing, or a breaker that feels hot, leave the breaker off and call a licensed professional. If you see smoke or fire, call 911.
Should you reset it?
The CPSC says breakers must be reset with the hand control after the problem has been eliminated. That's the key part. Resetting a breaker doesn't fix anything; it just tests whether the problem is still there.
Inverter makers say the same thing to technicians. SolarEdge's on-site troubleshooting checklist warns that if an AC breaker trips on site, do not power on the AC breaker before investigating the inverter.
A reasonable rule for homeowners: if nothing looks, smells, or sounds wrong, one reset is fine. If it trips again, leave it off and get it looked at.
Don't swap in a bigger breaker
It's tempting to fix a breaker that keeps tripping by putting in a larger one. The CPSC is direct about this: do not put in a higher ampere fuse or circuit breaker. A breaker is sized to protect the wire it feeds. A bigger breaker can let that wire run hotter than it's built for, and the original problem is still there.
The Arizona heat factor
Arizona summers add stress to electrical equipment. In Arizona summers, an outdoor panel or disconnect in direct sun can run hot, and heat can make a breaker that's already near its limit trip more easily. That doesn't make heat the cause on its own, but it can turn a borderline connection or a tired breaker into one that trips on the hottest afternoons.
If your trips cluster on summer afternoons, mention that. It helps narrow things down.
What a technician will look at
A solar troubleshooting visit usually checks the whole path from the panels to your main panel, not just the breaker. That typically includes the inverter or microinverters and their error history, the connections at the breaker and disconnects, the wiring and conduit for heat or damage, and whether the breaker itself is the right size and still working.
SolarFIX handles this kind of work through solar repair and electrical services. If the trouble turns out to be the inverter, our solar inverter repair page explains what happens next. If you're not sure what's wrong or you inherited the system with a house, a solar assessment gives you a written picture of where things stand.
If your system is leased
If you lease your panels or have a PPA, the solar company owns the equipment. Check your contract before you hire anyone, because the company that owns the equipment usually handles repairs to it. If that company is no longer around or isn't responding, a licensed solar company can still help you figure out what failed.
The bottom line
A solar breaker that keeps tripping isn't something to live with. Note when it happens, grab photos of the panel and the inverter, leave the breaker off if it trips again, and have a licensed electrician or solar technician find the cause. Once the cause is fixed, the breaker should stay put.
FAQ
Can I just leave the solar breaker off until someone looks at it?+
Yes, leaving it off is the safer choice when it keeps tripping. Your system won't send power to the house while that breaker is off, so expect your electric bill to go up until it's fixed.
Should I put in a bigger breaker so it stops tripping?+
No. The CPSC's home wiring guide says not to put in a higher ampere fuse or circuit breaker. The breaker is sized to protect the wiring, and a bigger one can let wires overheat.
My system is leased. Who do I call?+
Start with your lease or PPA contract. The company that owns the equipment usually handles repairs to it, and the contract says who pays and who you call.
Related: Solar repair · Solar inverter repair · Electrical services · Solar assessment
Is your solar breaker still tripping?
Tell SolarFIX which breaker trips, how often, and what your monitoring app shows. A photo of the inverter screen helps too.