Cost of a Main Electrical Panel Upgrade for Solar (and How to Avoid One)

A panel upgrade for solar typically costs about $2,500 to $4,500 for a 200-amp main panel, according to Aurora Solar's January 2026 guide, with utility work adding about $500 to $1,500 more when the meter socket or service conductors must change. Simple panel swaps can cost less, while upgrades that need rewiring, relocation or new underground service can cost much more.

Many homes do not need an upgrade at all. The deciding factor is usually the National Electrical Code "120% rule," and there are sometimes cheaper workarounds. Here is how to tell whether the charge on your solar quote is reasonable.

Key takeaways

• Aurora Solar cites $2,500 to $4,500 for a 200-amp upgrade; NerdWallet cites an average of $1,342 for a panel replacement using 2026 Angi data.
• The 120% rule limits how much solar a panel's busbar can accept. A standard 200-amp panel with a 200-amp main breaker leaves room for a 40-amp solar breaker.
• Alternatives can include derating the main breaker, a supply-side (line-side) connection or a power control system.
• Main panel upgrades were the highest-margin add-on for contractors in EnergySage's 2026 survey, so compare prices.
• Ask for the upgrade as a separate line item with a written reason.

How much does a panel upgrade for solar cost?

Published price ranges vary because "panel upgrade" can mean anything from a simple swap to a full service upgrade with new utility equipment.

Work	Typical cost	Source and date
200-amp panel upgrade	$2,500 to $4,500	Aurora Solar, Jan 2026
Utility work (service conductors or meter socket)	Adds $500 to $1,500	Aurora Solar, Jan 2026
Panel replacement, national average	$1,342 (range $125 to $4,500)	NerdWallet, citing 2026 Angi data
Panel upgrade when limited by solar backfeed	$2,000 to $5,000 or more	EG4 Electronics in North American Clean Energy, late 2024
Subpanel	$400 to $2,000	NerdWallet, 2026
Electric meter box	$100 to $650	NerdWallet, 2026

Labor is a large share. Aurora lists electrician rates of $50 to $120 an hour and says a full upgrade takes one to two days. NerdWallet puts rates at $50 to $150 an hour and says to expect at least $1,000 in labor.

Why solar can trigger a main panel upgrade

When solar connects on the "load side," it feeds power into your panel's busbar through a breaker. The busbar can only safely carry so much current, so the electrical code caps how much solar it can accept.

The 120% rule in plain English

Under NEC 705.12, when the solar breaker sits at the opposite end of the busbar from the main breaker, 125% of the solar output current plus the main breaker rating must not exceed 120% of the busbar rating. A North American Clean Energy article by EG4 Electronics walks through the common case:

• 200-amp busbar times 120% = 240 amps allowed.
• Subtract the 200-amp main breaker = 40 amps left for a solar breaker.
• Divide by 1.25 for continuous load = about 32 amps of continuous solar output.

Aurora Solar's table translates that into rough system sizes: about 2.5 kW for a 100-amp panel, about 5 kW for a 150-amp panel and 8+ kW for a 200-amp panel. Our guide to electrical panel capacity and the 120% rule goes deeper.

Other reasons installers recommend an upgrade

Aurora lists older 60- or 100-amp service, no open breaker slots, frequent tripped breakers, a hot or buzzing panel and visible rust. Adding a battery, an EV charger or a heat pump can also push a panel past its limits. EnergySage noted in a 2020 article that most homeowners, especially those in newer homes, do not need one.

What drives the cost of a panel upgrade for solar up or down

• Amperage. Larger panels cost more. NerdWallet says most replacements upgrade a 100- or 150-amp panel to 200 amps.
• Utility work. A new meter socket or service conductors adds cost and requires utility coordination.
• Relocation. Moving the panel adds labor and materials.
• Rewiring. NerdWallet says related rewiring can take 20 or more hours and that a high-amperage panel with extensive rewiring could approach $10,000 installed.
• Trenching or underground service. Aurora notes trenching and meter socket changes raise costs further.
• Meter and service entrance work. HomeAdvisor's cost guide (updated July 2022) lists $100 to $650 for a meter when the utility must provide new supply or metering, $200 to $800 for a meter box installed, and $1,000 to $1,500 for overhead service entrance cable or $5,000 or more for underground. It notes the utility usually handles service entrance work.
• Permits and inspection. HomeAdvisor says permits are usually required for panel replacement, relocation or amperage increases.

Alternatives to a main panel upgrade

Before you accept the charge, ask your installer whether any of these would work for your home. The right answer depends on your equipment and local code officials.

Option	How it works	Trade-offs
Derate the main breaker	Install a smaller main breaker (for example 175 A instead of 200 A) to make room for solar	Needs a review of your home's loads and your approval; less capacity for future loads
Supply-side (line-side) connection	Connect solar ahead of the main breaker under NEC 705.11	Can be costly; may not be possible with some combined meter-main panels
Power control system	Sensors limit solar output if the busbar would be overloaded (NEC 705.13)	Equipment must support it; may cap output at times
Smaller inverter or system	Keep solar output within the 32-amp limit on a 200-amp panel	Less solar production

Solar Builder's NEC explainer notes that derating a main breaker needs the client's approval and a look at the home's loads. The EG4 article says a supply-side tap may not be possible in California "meter main" panels where the supply side is not accessible.

Price per watt math: how an upgrade changes your solar quote

A panel upgrade raises your total cost without adding any solar output, so it raises your effective price per watt.

Example: an 8 kW system quoted at $2.60 per watt costs $20,800. Add a $3,500 panel upgrade and the total becomes $24,300, or about $3.04 per watt. That is why you should see the upgrade as its own line item. For context, EnergySage reported a median quoted solar price of $2.57 per watt in the first half of 2026.

The upgrade may still be worth it if it lets you add a battery, EV charger or heat pump later. Just make sure you are paying a fair price for it. See how much solar panels cost per watt for more benchmarks.

How to compare panel upgrade quotes

1. Ask why. Request the load calculation or the 120% rule math that shows an upgrade is required.
2. Ask about alternatives such as a breaker derate, supply-side tap or power control system.
3. Get it itemized. Panel, labor, permit, utility fees and any meter work should be listed.
4. Get a second price from a licensed electrician. EnergySage's 2026 contractor survey found main panel upgrades had the highest margin of the adjacent services it tracked, at 25%.
5. Confirm who coordinates with the utility and how long the power will be off.

Our hidden costs of going solar guide lists other add-ons to watch for.

Next steps

Upload your proposal to our solar quote checker to see your price per watt with and without the panel upgrade, and use the solar panel calculator to check whether a smaller system could avoid the upgrade.