Porter Ranch, CA · May 2023 – December 2025 · LADWP / LADBS

Porter Ranch: the better panel did not fit the roof.

Same brand, more watts, four centimetres longer. On a small roof plane that is the whole decision.

Written by the Cali Energy project team · California contractor license 1032379 · Updated September 2026

Module choice on a small roof is a geometry problem before it is an electrical one. On this Porter Ranch house the higher-output panel in the same family was physically larger and eleven of them would not fit the plane the household wanted to use, so the design went back to a slightly smaller module. Two years later the project restarted, that module was out of stock everywhere, and Cali Energy rebuilt the layout around a different manufacturer — with the household choosing to cover part of its usage rather than all of it.

At a glance

What was built

11 modules, south plane only

First specification

REC 405 W

Rejected

REC 410 W — physically too large for the plane

Built with

Canadian Solar 445 W

Coverage

Deliberately partial

Utility / AHJ

LADWP / LADBS

The story

Eleven modules. This is the smallest project in the Porter Ranch group and the one with the most decisions in it.

The first design used an eleven-module layout on a single roof plane. When the household asked about a higher-output panel from the same manufacturer, the answer was not about performance. The better panel is physically longer, and eleven of them do not fit the plane. The design stayed on the smaller module.

That surprises people, so it is worth stating plainly: on a small or broken-up roof, module dimensions decide the layout before wattage does. A panel that makes five percent more power and does not fit produces nothing at all.

The second decision came from a second quote. The household was weighing a proposal built on a different panel and a different microinverter, and asked for a like-for-like comparison. That is the right request and the hard part is making the comparison real: same module count, same roof planes, same shading assumption, same inverter class. Comparing a quote on one set of assumptions against a quote on another is how people end up buying the optimistic spreadsheet rather than the better system.

Then the project went quiet for two years, and that is where the third decision came from.

When it restarted, the module the design was built on was gone — not out of stock for a week, but unavailable from the distributors we buy from, along with the alternative from the same family. The layout had to be rebuilt around what could actually be bought, which turned out to be a 445 W panel from a different manufacturer. Bigger panel, fewer of them, same roof plane.

The household also made a choice that deserves more respect than it usually gets: it kept the array on the south plane only, knowing that would not cover the whole electricity bill. Solar sales tends to treat full offset as the only correct answer. It is not. A household that wants panels on one plane, and has its own reasons, is making a legitimate trade — and it should be given the number that goes with it rather than a redesign it did not ask for.

The installation went in at the end of the year. One detail from it is the kind of thing that does not appear in quotes: the conduit run on the outside wall was painted to match the trim, and the household noticed and said so. Making the electrical work disappear into the house is not a code requirement. It is the difference between an installation somebody tolerates and one they are happy to point at.

The meter installation was assigned to a crew in the middle of December and permission to operate followed. The household asked to be present when the system was switched on, so the start-up was held until after the new year.

Eleven modules, on the single plane the household wanted, from a manufacturer that could actually be delivered — and the owners there on the day it was switched on, which is how they asked to end it.

Cali Energy designed, permitted and installed this array in Porter Ranch.

How it ran

Two and a half years between the first estimate and the meter, and the array on the roof is not the one first drawn.

What we did

• Rejected a higher-output module because it did not fit the roof plane.
• Rebuilt the comparison against the second quote on matched assumptions.
• Redesigned around available equipment when the original module went unavailable.
• Built the partial-coverage system the household asked for instead of talking it up.
• Painted the exterior conduit to match the trim.

System specifications

Is your project like this one?

• Your roof planes are small and broken up.
• You are comparing two quotes built on different panels.
• The panel in your quote is no longer available.
• You want panels on one side of the house only.

Cali Energy in Porter Ranch

Frequently asked questions

Why would a higher-output solar panel be the wrong choice?

Because panels differ in physical size as well as in wattage. On a small or broken-up roof plane a longer module can reduce how many fit, and fewer larger panels can produce less than more smaller ones. Layout is checked before wattage.

How do I compare two solar quotes fairly?

Match the assumptions first: same module count, same roof planes, same shading percentage, same inverter class. Quotes built on different assumptions are not comparable, and the more optimistic spreadsheet usually wins on paper.

What happens if the panel in my design is discontinued?

The layout is rebuilt around what can be bought. A different module means different dimensions and a different count, so the drawing changes — which is cheaper to do before installation than to explain at inspection.

Is it acceptable to cover only part of my electricity use?

Yes, and it is a legitimate choice. Partial coverage on one roof plane is common where a household does not want panels on a visible side. What matters is being given the production number that goes with the decision.

Does Cali Energy install small solar systems in Porter Ranch?

Yes. Eleven modules is a normal project here, permitted through LADBS and interconnected through LADWP like any other. Small systems get the same plan set and the same inspection as large ones.

What this would look like on your roof

Related

• The module in the design was no longer made Santa Clarita · 26 modules · found at the order, not at the drawing Solar
• Two production models, two different answers Porter Ranch · 9.8 kW · the gap was in the assumptions, not the hardware Solar
• Not on the roof the street can see Porter Ranch · 22 modules · appearance and fire clearance set the layout Solar
• The contract named a module. The warehouse had a different one Simi Valley, CA · 21 modules · what makes a substitution acceptable Solar

This timeline reflects this property and this permitting path. Updated September 2026.