Older electrical service, roof planning, and PWP solar in Pasadena 91103

Older service equipment should be evaluated before solar sizing

Ask whether the existing service rating, panel condition and breaker capacity support the proposed solar, storage and future loads.

If an upgrade is recommended, request the specific electrical reason and whether the project can be phased.

The PWP application and City permit should reflect the same final service configuration.

Roof life should be coordinated with the PWP application timeline

An older home may also have an aging roof. Ask whether reroofing should happen before the solar design is finalized.

If the roof changes, update the array layout and production estimate before construction.

Keep roof and solar warranties separate.

PWP rules should replace generic Southern California assumptions

Pasadena's municipal utility has its own PowerClerk application and interconnection agreements.

Ask the installer to identify which PWP agreement applies and how the financial model treats exports and remaining grid purchases.

If SCE terminology appears in the proposal, request a PWP-specific correction.

Battery storage should be integrated with the older-home electrical plan

A battery can add backup capability but also changes electrical equipment and load-panel design.

Ask which circuits will be backed up, whether a critical-load panel is needed and whether the existing electrical system requires additional modernization.

Compare solar-only and solar-plus-storage cases using the same PWP assumptions.

Permit, inspection, and PTO should be tracked separately

PWP's workflow separates initial utility review, City permitting, construction, inspection, meter work and permission to operate.

Ask the contractor to identify which step is pending and who owns the next action.

Keep the final one-line, permit approvals and PWP PTO records together for future service.

Pasadena 91103 homeowner checklist

Gather PWP bills, service-panel photos, roof information, EV/HVAC plans and battery goals.

Confirm PWP application assumptions and any service-upgrade rationale before financing.

Compare total project price, roof work, electrical upgrades, storage and long-term support.

How Home Solar Simplified reviews a solar proposal

Every local guide uses the same homeowner-first review standard so a proposal can be evaluated without relying on a sales presentation. Start with the home's actual electric bills and identify which future loads are genuinely likely: electric vehicles, heat pumps, electric water heating, pool equipment, an accessory dwelling unit, or battery storage. Ask the installer to separate today's usage from future assumptions instead of blending them into one unexplained annual number.

Next, compare the physical system. Write down the proposed DC system size, first-year production estimate, degradation assumption, module and inverter models, battery usable capacity and power rating if storage is included, roof planes used, shade assumptions, attachment method, equipment locations, and any service-panel or roofing work. The production model should match the final permitted layout. If panels move during engineering, HOA review, planning review, or permit corrections, request an updated production estimate before installation.

Then compare money on a cash-price basis before looking at monthly payments. Ask for the cash price of the solar array, battery, roof work, service upgrade, EV charger, trenching, permits, and other add-ons as separate line items. If financing is used, compare the financed amount, interest rate, term, dealer fees or prepaid finance charges, total scheduled payments, and prepayment rules. Tax-credit assumptions should be treated as estimates for discussion with a qualified tax professional, not as guaranteed discounts from the contractor.

Review the utility assumptions separately. The proposal should identify the actual electric utility, current rate structure, estimated self-consumption, exports, remaining grid purchases, and any battery dispatch strategy. A city, ZIP code, or neighboring home does not prove the exact service arrangement at a property. Utility rules, rates, interconnection requirements, and equipment eligibility can change, so the installer should confirm the current rules for the specific account before the homeowner relies on projected savings.

Finally, review responsibility after the sale. Ask who handles permit corrections, utility interconnection, inspection failures, monitoring problems, inverter or battery warranty claims, roof leaks near attachments, and future array removal for roof work. Keep the signed contract, approved plans, equipment cut sheets, inspection record, permission-to-operate documentation, warranties, and final one-line electrical diagram together. A solar project should remain understandable years after the original salesperson is gone.

When comparing two or three proposals, normalize them before deciding. Put the same fields into one worksheet: cash price, financed price, system size, first-year production, estimated annual consumption, future-load assumptions, battery capacity and power, roof work, service upgrades, permit responsibility, workmanship warranty, equipment warranties, monitoring support, and the estimated utility bill that remains. If one proposal uses a different roof layout, rate assumption, financing term, utility escalation rate, or battery operating strategy, mark that difference instead of treating the monthly payments as directly comparable. Ask each contractor to correct obvious assumption mismatches so the homeowner is comparing systems on equal footing. The lowest payment is not necessarily the lowest project cost, the largest array is not necessarily the best value, and the highest production estimate is not necessarily the most credible. A useful comparison makes the assumptions visible enough that a homeowner can explain why one proposal is stronger without repeating a salesperson's slogan.

Related homeowner research

Adjacency QA: ZIP links are topical and geographic-navigation links, not claims of municipal physical adjacency.

Frequently asked questions