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Summer is the most electrically demanding season for any Fresno home. The central AC runs for hours every day, refrigerators work harder in the heat, fans run in every room, and outdoor gatherings add extension cords and plugged-in devices to the mix. For most homes built in the last twenty years, that load is manageable. For older homes that have never had their electrical panels updated, summer is when a panel that has been quietly struggling finally makes itself known.
The warning signs are not always dramatic. Flickering lights, a breaker that trips when you run the AC and the microwave at the same time, or a panel that feels warm to the touch can all seem like minor inconveniences. They are not. They are a panel communicating that it is being pushed past what it was designed to handle, and the consequences of ignoring those signals range from nuisance to serious fire risk.
Here is what to watch for, what the signs mean, and what an upgrade actually involves for a Fresno homeowner.
Why Summer Stresses Electrical Panels More Than Any Other Season
A central air conditioning system is one of the largest single electrical loads in a residential home. A standard 3-ton central AC unit draws roughly 3,500 watts while running. When the compressor kicks on, it pulls a startup surge that exceeds its running load for a few seconds. In a Fresno summer, that startup surge happens dozens of times per day.
Add the cumulative draw of refrigerators, ceiling fans, televisions, computers, phone chargers, and any outdoor equipment, and the total electrical load in a Fresno home during peak summer hours often approaches or exceeds what an older 100-amp panel was designed to supply. Homes that added air conditioning, a hot tub, an EV charger, or a tankless water heater after the original panel was installed are particularly likely to be running at or near capacity without realizing it.
Warning Signs Your Panel Is Due for an Upgrade
Breakers that trip repeatedly
An occasional tripped breaker is normal. The breaker did its job: it detected an overload and cut the circuit before the wiring could overheat. A breaker that trips regularly on the same circuit, or multiple breakers tripping throughout a typical day, is a sign that the panel does not have enough capacity for your home’s actual electrical load. Resetting breakers repeatedly is not a fix. It is a panel asking to be assessed by a licensed electrician.
Lights that flicker or dim when appliances start
If your lights dim noticeably when the AC compressor kicks on, when you start the microwave, or when another high-draw appliance starts up, the panel is struggling to supply steady voltage across all circuits simultaneously. This voltage instability is hard on electronics and appliances over time and is a reliable indicator of a panel that is undersized for current demand.
The panel feels warm or makes buzzing or crackling sounds
A properly functioning electrical panel should be at or near room temperature. A panel that feels warm to the touch, or that produces buzzing, crackling, or humming sounds, is showing signs of overheating or of loose and deteriorating connections inside the enclosure. Either condition is a fire risk that warrants an immediate inspection by a licensed electrician, not a wait-and-see approach.
Burning smell or scorch marks near the panel or outlets
A burning smell near the electrical panel or visible scorch marks around the panel cover or any outlet in the home are emergency warning signs. Turn off the main breaker and call a licensed electrician the same day. These signs indicate that wiring is overheating, and an electrical fire can develop rapidly once that process begins.
You are running the house on extension cords and power strips
Chronic reliance on extension cords and multi-outlet power strips to compensate for insufficient outlets is a sign that the home does not have enough circuits for its actual usage. It is also a fire hazard in its own right: extension cords are not designed for continuous heavy loads, and daisy-chaining power strips bypasses the circuit protection the panel was designed to provide.
Your panel is 100 amps or less
The current standard for residential electrical service in new construction is 200 amps. Homes built before the 1980s were often wired with 60-amp or 100-amp service, which was appropriate for the electrical loads of that era. A home with a 100-amp panel that has added central AC, a dishwasher, a washer and dryer, and modern electronics since it was built is running a modern electrical life through infrastructure that was not designed for it.
Your panel is Federal Pacific Electric or Zinsco
Federal Pacific Electric (FPE) Stab-Lok panels and Zinsco panels, both common in homes built between the 1950s and 1980s, have well-documented safety records that concern electricians and fire safety professionals. Independent testing has found that breakers in these panels can fail to trip during an overload in a significant percentage of cases, meaning the safety mechanism the panel relies on may not function when it is needed most. If your panel bears either of these names, have it evaluated by a licensed electrician without delay, regardless of whether you are currently experiencing symptoms.
What a Panel Upgrade Actually Involves
An electrical panel upgrade replaces the existing breaker box with a new, higher-capacity panel. The most common upgrade for Fresno homes is from 100-amp service to 200-amp service, which is the current residential standard and provides enough capacity for central AC, modern appliances, and future additions like an EV charger or additional circuits.
The process involves coordinating with PG&E for a service meter disconnect and reconnect, pulling a permit from the City of Fresno Building Division, performing the installation, and scheduling a city inspection before the panel is energized. Under California law, all electrical panel replacements require a permit and must be performed by a licensed C-10 Electrical Contractor. The permit and inspection are not bureaucratic formalities: they are the mechanism that ensures the work meets the 2025 California Electrical Code and that your home insurance remains valid.
A contractor who offers to skip the permit process to save time or money is creating a liability for the homeowner, not a favor.
What a Panel Upgrade Makes Possible
Beyond addressing the safety concerns an aging or undersized panel creates, a panel upgrade opens the door to home improvements that are difficult or impossible on limited electrical service:
- Level 2 EV charger installation, which requires a dedicated 240V circuit that a 100-amp panel often cannot accommodate alongside existing loads
- Whole-home backup generator connection via a proper transfer switch
- Additional circuits for a home office, workshop, or accessory dwelling unit
- Solar panel system installation, which typically requires a panel assessment and often an upgrade as part of the interconnection process
- Future HVAC upgrades including heat pumps, which draw more power than conventional AC-only systems
For homeowners planning any of these projects, evaluating the panel first prevents the frustration of completing other work only to find the electrical infrastructure cannot support it.
Frequently Asked Questions
How do I know if my panel is 100 amps or 200 amps?
Look at the main breaker at the top of your electrical panel. It will have a number printed on it indicating the amperage, typically 60, 100, 150, or 200. If the number is 100 or below, and your home has central AC along with a full complement of modern appliances, an electrician’s assessment of whether the service is adequate for your current load is worthwhile.
Is an electrical panel upgrade required to add an EV charger?
Not always, but often. A Level 2 EV charger requires a dedicated 240V circuit drawing 40 to 50 amps. If your current panel has available breaker slots and sufficient remaining capacity, the charger can be added without a full panel upgrade. If the panel is already heavily loaded or does not have open slots, an upgrade is typically required before the charger circuit can be installed safely.
Do I need to be home during the panel upgrade?
Your power will be shut off for part of the installation day while the work is in progress and while PG&E performs the meter disconnect and reconnect. Plan for a full day without power. The city inspection typically happens within a day or two after installation and does not require the homeowner to be present.
Does a panel upgrade affect my homeowners insurance?
It can, in a positive direction. Some insurers charge higher premiums or limit coverage for homes with known problem panels such as Federal Pacific Electric or Zinsco. An upgrade to a modern, code-compliant panel removes that underwriting concern. Contact your insurer before and after the work to confirm how the upgrade affects your policy.
A Summer Breakdown Is the Wrong Time to Discover Your Panel Is Undersized
The electrical panel is the part of a home that most homeowners never think about until something goes wrong. In a Fresno summer, with the AC running hard every day, it is the part of the home under the most sustained stress. The warning signs in this post are the panel’s way of communicating before a tripped breaker, a failed component, or a more serious event forces the issue.
Allbritten’s licensed electricians serve Fresno and the surrounding San Joaquin Valley with electrical panel assessments, upgrades, and full service installations. If your home is showing any of the signs above, schedule an inspection through our electrical panel upgrades service page or call 559-601-0833.