Good solar starts with good design. Before a single panel goes on your roof, a well-run process confirms how much energy you use, how much your roof can produce, and what equipment fits your home and goals. This page walks Los Angeles homeowners through what to expect, step by step, so the project feels clear and predictable from the first conversation to the day the system switches on.
Home Upgrade Specialist is a licensed Southern California solar, roofing, and battery contractor (CSLB #1031989 HVAC, CSLB #1055444 solar/roofing/battery) and a Tesla Certified Premium Installer serving Los Angeles and Orange County. Every recommendation comes in a written, itemized estimate — no guaranteed-number sales pitch.
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Several decisions happen during design. Inverter architecture — microinverters versus a string inverter — affects shade handling and monitoring. Roof condition determines whether roofing should come before solar. And under California's net-billing rules (NEM 3.0), how much of your own production you use influences whether a battery belongs in the design. We talk through each of these so the trade-offs are clear before you commit.
Because exported solar is generally credited at lower rates under NEM 3.0, a thoughtful design focuses on using more of what you generate. That can mean sizing the system around your real usage and, where it fits, adding storage so evening demand draws from your own battery rather than the grid.
Do not compare solar proposals using panel count and total price alone. A decision-ready proposal should let you identify the exact equipment, modeled Year 1 production, assumptions behind that production estimate, electrical work that is included or still conditional, roof and mounting scope, permit and interconnection responsibilities, and each separate manufacturer and installer warranty.
| Proposal item | What you should be able to identify |
|---|---|
| Solar array | Panel make/model, quantity, wattage, and total DC system size |
| Inverter system | Exact equipment and configuration |
| Battery | Model, quantity, storage, and proposed backup configuration |
| Year 1 production | Modeled annual kWh and monthly profile when available, for comparison with the home's usage pattern |
| Production assumptions | Shading, orientation, tilt, losses, degradation, modeling method, and any utility-rate assumptions used in financial illustrations |
| Electrical | Existing-service assumption, panel, meter, disconnect, Gateway or backup-load work, and confirmed scope vs. allowance |
| Roof | Roof condition, mounting, flashing, membrane work, penetrations, and roof-related exclusions |
| Permits/interconnection | Who prepares, pays for, and closes design submittal, permit corrections, inspection, and utility PTO |
| Warranties | Panel, inverter, battery, and installer workmanship/labor coverage stated separately, including any registration requirements |
| Conditional allowances | Items awaiting engineering, utility review, inspection, or site access clearly labeled |
Modeled solar production is an estimate, not a guaranteed utility-bill outcome. NREL's PVWatts is one tool used to estimate PV energy production, while California consumer-protection rules require transparency around solar costs, financial obligations, savings assumptions, and the exact equipment promised in the agreement. Review California's Solar Consumer Protection Guide.
We design around your roof, usage, and goals — and put it all in a written, itemized estimate before any work begins.
Request a Free EstimateCall (833) 446-6387We review your electricity usage, evaluate your roof and shading, confirm your electrical panel can support the system, and discuss your goals such as bill offset or backup power. From there we propose a system size, equipment, and layout in a written, itemized estimate.
Timelines vary by roof complexity, utility, and permitting jurisdiction, so we give you a realistic schedule for your specific project rather than a generic promise. The design itself often moves quickly once we have your usage data and a roof assessment.
System size is based on your historical electricity usage, your roof's usable space and orientation, shading, and your goals under NEM 3.0 — including whether you want to add a battery for self-consumption or backup. We size to your home, not a one-size template.
If your roof is near the end of its service life, it is usually smarter to address roofing before panels go on, so you avoid removing and reinstalling the array later. We assess roof condition as part of the design conversation.
