What Is a Main Service Panel?
The main service panel — sometimes called a breaker box, load center, or electrical panel — is the central distribution point for all electrical circuits in a home. It receives power from the utility at the service entrance and routes it through individual circuit breakers to each branch circuit serving lights, outlets, HVAC systems, and appliances throughout the home.
When a solar system or home battery is added to a residence, the panel must have sufficient capacity and available breaker space to accommodate the new equipment safely and in compliance with applicable electrical codes.
When Is a Panel Upgrade Necessary?
Not every solar installation requires a panel upgrade. A licensed electrician assesses your specific panel during the solar site evaluation and makes a determination based on the following factors:
- Service amperage: A 200-amp service is the standard for modern solar installations, particularly those including battery storage. Homes with 100-amp or smaller services are commonly upgraded as part of the solar project.
- Available breaker positions: Solar and battery systems require dedicated breaker spaces. A panel that is fully occupied cannot accommodate the necessary additions without modification or replacement.
- Panel condition and compatibility: Panels with outdated technology, damaged components, or code compliance concerns may be upgraded independently of available capacity.
Approximately 40% of homes assessed by Solergy require a panel upgrade; the remaining 60% can accommodate solar interconnection on their existing panel.
The Upgrade Process
A main service panel upgrade involves the following steps:
- Installation of a new 200-amp main service panel
- Transfer of all existing circuit breakers and wiring to the new panel
- Installation of solar disconnect, battery circuit breakers, and associated safety equipment
- Permit application, submission, and coordination of the required municipal electrical inspection
The work is performed by licensed electricians and typically requires one day on-site. The permit and inspection process adds approximately one to two weeks to the project timeline.
Cost
Main service panel upgrades in Texas are typically priced between $5,000 and $8,000 inclusive of all materials, labor, and permits. This cost is fully disclosed in the project proposal and can be incorporated into solar financing arrangements when applicable, distributing the expense over the loan term alongside the solar system.
Long-Term Infrastructure Value
A new 200-amp main service panel is a significant improvement to your home's core electrical infrastructure. In addition to enabling solar interconnection, it provides adequate capacity for future electrical additions — including EV charging, additional HVAC equipment, or battery storage expansion — for decades to come. The upgrade is reflected in your home's appraised value and contributes to its overall electrical safety and reliability.