The solar installer's pitch is compelling. Lower utility bills. Energy independence. Federal tax credits. Net metering with LADWP. A system that pays for itself over time and adds value to your property. Everything they're telling you is true — and none of it matters if your electrical panel can't support the system they're proposing to install.

This is the conversation that happens after the solar contract is signed, after the deposit is paid, and after the installation crew shows up and opens your electrical panel for the first time. It is the conversation nobody in the solar sales process initiated — because the solar company's job is to sell solar, not to assess your electrical infrastructure. And it is the conversation that turns a straightforward solar installation into a multi-month, multi-contractor project with costs that weren't in the original proposal.

In Los Angeles, a significant percentage of residential and multifamily properties that are solar-ready from a rooftop and orientation standpoint are not solar-ready from an electrical infrastructure standpoint. The panel is undersized. The panel is a flagged brand. The service entrance can't accommodate a grid-tied inverter connection without modification. The meter base needs to be upgraded for net metering enrollment. And none of these conditions appear in the solar company's site assessment, because most solar companies are not electrical engineers — they are solar installers.

The panel has to come first. Here is why — and what doing it right actually looks like.

How Solar Power Connects to Your Electrical System — The Basic Infrastructure Logic

To understand why the panel is the prerequisite for solar, it helps to understand how a grid-tied solar system actually connects to your home or building's electrical infrastructure.

A photovoltaic solar array on your roof generates direct current electricity — DC power — which is converted to alternating current by an inverter. That AC power is then fed into your electrical panel, where it either supplies the loads in your building directly or flows back through the meter to the LADWP grid — the net metering arrangement that credits your account for excess generation.

The connection point between the solar system and your building's electrical system is the panel. Specifically, a solar system connects to a dedicated breaker position in the main panel — or in a subpanel, with specific code requirements around the connection point and its relationship to the main breaker. The National Electrical Code has precise requirements for how solar systems connect to the panel: the combined amperage of the solar feed and the main service breaker cannot exceed 120% of the panel's rated busbar capacity, among other requirements.

This 120% rule — sometimes called the solar backfeed rule — is the specific code provision that most often makes a panel upgrade a prerequisite for solar installation. If your panel has a 100-amp main breaker and a 100-amp busbar, the maximum solar feed breaker is 20 amps — which limits the solar system size that can legally connect to the panel. If your solar installer is proposing a system that requires a 40-amp feed breaker, and your panel's busbar math doesn't support it, the solar system cannot be legally installed without a panel upgrade or a main breaker derate — and main breaker derates have their own code limitations.

This is a mathematical reality that exists before the first panel is mounted on the roof. It should be identified and priced before the solar contract is signed. In most solar sales processes, it is not.

The Three Panel Conditions That Block Solar Installation

Not every undersized or outdated panel creates the same problem for solar installation. The specific panel condition determines the specific upgrade required — and the specific upgrade determines the cost and timeline. Understanding which condition your panel has allows you to price and plan the upgrade correctly before you commit to a solar contract.

The Undersized Service Entrance

A 100-amp service entrance — the most common condition in LA's pre-1980 housing stock — is the panel condition most likely to require a full service upgrade before solar can be installed.

The math: a 100-amp service entrance with a 100-amp main breaker allows a maximum solar feed breaker of 20 amps under the 120% rule. At 240 volts, 20 amps supports a solar system of approximately 4.8 kilowatts. For most residential properties in Los Angeles, a 4.8-kilowatt system is smaller than the optimal system size for the roof area and consumption profile — which means the owner either accepts an undersized system or upgrades the service to support a larger one.

A 200-amp service — the current standard for new residential construction — allows a 40-amp solar feed breaker, supporting a system of up to 9.6 kilowatts. For most single-family homes in LA, this covers the full optimal system size. For properties with EV charging, pool equipment, or high HVAC loads, even 200-amp service may warrant further evaluation.

For multifamily properties pursuing shared solar or community solar arrangements, the service entrance requirements scale with the system size and the number of units — and frequently require 400-amp or larger service entrances that are well beyond the capacity of most existing multifamily electrical infrastructure.

The Flagged Panel Brand

Federal Pacific Stab-Lok panels and Zinsco panels — both of which were installed extensively in Los Angeles construction through the 1980s — are not simply outdated. They are documented fire hazards with specific failure modes that have been the subject of consumer safety research, insurance carrier exclusions, and in some cases product liability litigation.

Federal Pacific Stab-Lok breakers have a documented tendency to fail to trip under overcurrent conditions — meaning they don't interrupt the circuit when they should, allowing wiring to overheat without the breaker providing the protection it was designed to provide. Zinsco panels have documented issues with aluminum bus bars that corrode and create loose connections, again compromising the protection the breaker is supposed to provide.

Solar installers who encounter these panels during a site assessment face a binary choice: refuse to connect the solar system to a panel with documented safety issues, or connect the system and accept the liability of energizing a panel that has known failure modes. Most reputable solar installers choose the former — which means the solar installation cannot proceed until the panel is replaced.

If your home has a Federal Pacific or Zinsco panel, the panel replacement is not optional from a solar installation standpoint — and it is not optional from a safety standpoint regardless of solar. The replacement should happen whether or not you go solar.

The Full Panel — No Available Breaker Positions

This is the simplest and most common panel condition that blocks solar installation: the panel has no available breaker positions for the solar feed breaker.

Older panels — particularly 100-amp panels in homes that have been renovated and had circuits added over the decades — frequently have every breaker position occupied. The solar feed breaker has nowhere to go. The solutions are to remove or consolidate existing circuits to free up positions, to add a subpanel that creates additional breaker capacity, or to replace the panel with a larger unit that has sufficient positions for both existing circuits and the solar feed.

This is a straightforward electrical engineering problem with well-established solutions. But it is a problem that must be identified and resolved before the solar installation can proceed — not discovered by the installation crew on the day they show up with the inverter.

What Net Metering Enrollment Requires From Your Meter and Service

The financial case for solar in Los Angeles depends significantly on LADWP's net metering program — the arrangement under which LADWP credits your account for excess solar generation that flows back to the grid. Without net metering enrollment, the economics of solar change significantly: you can only capture the value of electricity you generate and consume yourself, not the value of excess generation.

Net metering enrollment through LADWP requires a bidirectional meter — a meter capable of measuring both the electricity flowing from the grid into your building and the electricity flowing from your building back to the grid. Many older LADWP meter installations use unidirectional meters that must be replaced before net metering enrollment can be completed.

The meter replacement is performed by LADWP — it is the utility's equipment, and the utility's crews handle the swap. But it requires a formal application, a LADWP engineering review, and scheduling that operates on LADWP's timeline. For properties that also require a service entrance upgrade — a new meter base, new service entrance conductors, or a new service panel — the LADWP coordination for the meter replacement is part of the same utility application process.

Owners who initiate solar installation without first confirming LADWP net metering enrollment status — and identifying any meter or service conditions that must be resolved before enrollment — frequently find themselves with a completed solar installation that cannot be enrolled in net metering because a utility coordination step was missed. The system generates power. It feeds the building. But the excess generation flows to the grid without credit, because LADWP's metering infrastructure hasn't been updated to track it.

This coordination failure is entirely preventable — and entirely the result of starting with the solar hardware rather than starting with the electrical infrastructure assessment.

The Solar Tax Credit Timeline — Why Infrastructure Delays Are Expensive

The federal Investment Tax Credit — currently 30% of the total solar system cost under the Inflation Reduction Act — is one of the primary financial drivers of residential and commercial solar adoption. The credit applies to the tax year in which the solar system is placed in service — meaning the year in which the system is installed, permitted, and operational.

For property owners who are planning to claim the ITC in a specific tax year, the panel upgrade timeline matters enormously. A solar project that stalls because the panel upgrade wasn't initiated until after the solar contract was signed — and that misses the tax year deadline because the LADBS permit for the panel upgrade took three months and the LADWP transformer coordination took another two — is a project where the owner's tax planning has been disrupted by a scheduling failure that was entirely preventable.

The panel upgrade is the long-lead item in a solar project. The solar hardware — panels, inverter, racking — is available on relatively short lead times. The LADBS permit for a panel upgrade, combined with the LADWP service coordination, is typically the eight to twelve week critical path item. Initiating the panel upgrade first — before the solar contract is signed, or at minimum simultaneously with it — is the scheduling approach that protects the tax credit timeline.

Property owners who call SKS after the solar contract is signed and the tax credit deadline is approaching are the owners for whom the panel conversation is most expensive. Property owners who call us before the solar conversation gets to the contract stage are the ones who close the solar project on schedule, at the planned cost, and with the tax credit intact.

The Multifamily Solar Opportunity — And Why It Requires More Infrastructure

The solar conversation in Los Angeles has historically focused on single-family homeowners — the rooftop array that serves the household below it. The multifamily solar opportunity is substantially larger, substantially underutilized, and substantially more dependent on electrical infrastructure that most multifamily buildings don't currently have.

Multifamily solar in Los Angeles takes several forms. A rooftop array serving the building's common area electrical loads — corridor lighting, laundry room, parking structure lighting, elevators — is the simplest configuration and the one with the most straightforward electrical infrastructure requirements. The array connects to the common area electrical meter, which typically has more available panel capacity than individual unit meters.

Community solar — where the rooftop array's generation is allocated across individual unit meters, reducing each tenant's LADWP bill — is the more ambitious and more financially compelling configuration for multifamily solar. It requires a more sophisticated metering and billing arrangement, a larger array sized for the aggregate consumption of multiple units, and electrical infrastructure capable of supporting the grid-tied inverter connection at the building's main service entrance.

For 8 to 20-unit buildings — the multifamily segment that is most underserved by both the solar industry and the electrical upgrade industry — the opportunity is significant: rooftop area that is typically underutilized, aggregate electrical consumption that justifies a meaningful solar investment, and common area electrical bills that are sensitive to energy cost escalation. The infrastructure barrier — the service entrance upgrade, the LADWP coordination, the panel capacity — is the obstacle that prevents most of these buildings from capturing the solar opportunity.

SKS builds the infrastructure. The solar installer installs the panels. The sequence matters: infrastructure first, solar second.

What a Properly Sequenced Solar-Ready Panel Upgrade Looks Like

The right approach to going solar in Los Angeles is to begin with an electrical infrastructure assessment — before the solar contract, before the deposit, before the inverter is specified. The assessment establishes the current panel capacity, identifies any flagged equipment that must be replaced, determines the service entrance upgrade required to support the proposed solar system size, and initiates the LADWP coordination for the meter upgrade and transformer capacity review.

The panel upgrade scope is then designed around the solar system requirements — not retrofitted to accommodate a solar system that was designed without knowledge of the panel's constraints. The new panel is sized to support both the solar feed breaker and any other electrical improvements the property owner is planning — EV charging, HVAC upgrades, ADU additions — so the upgrade is done once, correctly, at a size that serves the property's ten-year electrical needs rather than just the immediate solar requirement.

The LADBS permit for the panel upgrade is filed concurrently with the solar permit — or sequentially if the panel upgrade must precede the solar connection — with the solar installer coordinating their permit submission around the panel permit timeline.

LADWP coordination — meter upgrade application, transformer capacity review, service energization scheduling — is initiated at project inception and tracked through to completion before the solar installation is scheduled.

The solar installation happens last — on a timeline that reflects the panel upgrade completion and LADWP energization, not a timeline the solar company set when they signed the contract without knowing the panel situation.

This is the sequence that protects the tax credit timeline, eliminates the change order surprises, and produces a solar installation that is permitted, inspected, net metering enrolled, and operational — not stranded behind a panel problem that nobody addressed until the installation crew arrived.

What SKS Brings to the Solar Preparation Process

SKS Construction does not install solar panels. We are not a solar company. What we are is the firm that makes your property solar-ready — the electrical infrastructure partner that handles everything between the utility meter and the point where the solar installer connects their inverter.

Our in-house licensed engineer assesses your existing panel and service capacity, designs the upgrade to support your proposed solar system, manages the LADWP coordination, pulls the LADBS permit, completes the installation, and obtains the final inspection sign-off. We supply panels directly — no distribution markup — and we coordinate with your chosen solar installer to ensure our work is sequenced correctly with theirs.

For multifamily property owners pursuing community solar or common area solar, we design and install the complete electrical infrastructure — service entrance upgrade, metering configuration, panel capacity — that the solar system requires to operate legally and efficiently.

Thirty-nine years. Over 3,000 completed projects. 80% repeat clients. Fixed-price bids with no subject-to-change clauses. Direct owner access to Shahab and Sam Shaolian. One firm that handles the infrastructure correctly, the first time, so the solar company can do their job when they arrive.

Get a FREE Solar-Ready Panel Assessment

SKS Construction offers FREE electrical panel assessments for property owners across Los Angeles County who are considering solar installation. Our in-house engineer will evaluate your existing service capacity, identify any panel conditions that must be resolved before solar can be installed, initiate LADWP pre-coordination for your service upgrade, and provide a fixed-price panel upgrade proposal — so you know your infrastructure cost before you sign a solar contract.

Don't let the solar company discover your panel problem after the deposit is paid. Know your infrastructure situation first.

Call (818) 855-1181 or email info@sksconstruction.com to schedule your FREE solar-ready panel assessment today.