A solar proposal is only useful when it fits the roof, service equipment, present loads and planned electrification. Document energy goals, shade, roof condition, service capacity, equipment locations, permit ownership and utility milestones before comparing array size or product names.
Require measured usage, load assumptions, shade and roof review, array layout, production method, service and panel assessment, one-line diagram, equipment locations, permit and utility responsibility, shutdown plan, monitoring setup, commissioning results and closeout records. Separate confirmed scope from future-load allowances.
Collect at least a representative usage history and list planned EV charging, heat pump, water heating or accessory loads. Decide whether the objective is annual energy offset, resilience, electrification capacity or a staged combination. An array sized only from a recent bill may not fit a household whose fuel use and loads are changing.
Record roofing type, age evidence, condition, framing access and likely replacement horizon. Identify attachment, flashing and warranty responsibility. Removing and reinstalling an array for an early roof replacement adds avoidable coordination, so the proposal should explain the chosen sequence rather than treating the roof as an unrelated surface.
Trees, dormers, hips, vents and required access can reduce usable array area. Ask for the modeled production assumptions, orientation, tilt and shade inputs—not a guarantee detached from methodology. Preserve the trees and site conditions assumed by the model so later landscaping decisions do not silently invalidate the comparison.
Document service rating, main disconnect, panel condition, breaker space, grounding and bonding, and the actual load method used. A panel replacement is not automatically required for every solar project, nor should existing equipment be assumed adequate without review. Compare designs on the same present and future load scenario.
If batteries or backup are included, list which circuits remain energized, transfer or isolation controls, equipment location, ventilation or clearance needs and the expected owner operating sequence. Whole-home language can be misleading unless loads and duration assumptions are explicit. Commission the selected modes with the owner present.
Lake Oswego provides building permit resources, while electrical permits and utility interconnection follow their applicable pathways. The proposal should name the permit holder, drawing responsibility, correction response, inspection, meter or interconnection steps and permission-to-operate boundary. Installation completion is not the same as authorization to energize.
Mark inverter, battery, disconnect, meter and conduit routes on a property drawing. Check working space, noise sensitivity, weather exposure, vehicle contact, appearance and service access. A late location change can alter conductor length, trenching, fire access and finish restoration, so obtain owner agreement early.
Verify labels, shutdown procedure, monitoring account, array mapping, communications, operating modes and observed start-up results. Keep permits, approvals, equipment models and serials, warranties, roof attachment records, photos and owner instructions. The closeout should let another qualified person understand the installed system without reverse-engineering it.
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The city's Building Division provides permit and inspection information for address-specific projects.
Oregon BCD explains licensing requirements and tools for verifying electrical businesses and workers.
A site-specific shade model should state the tree and seasonal assumptions used in the proposed production estimate.
| Observed constraint | Decision to document | Acceptance evidence |
|---|---|---|
| Roof near planned replacement | Sequence roofing before array | Roof warranty and flashed attachments |
| Shade varies by season | Model array and tree assumptions | Shade analysis and layout |
| Panel space is limited | Assess load and equipment options | Approved one-line and labels |
| EV or heat pump planned | Include future load scenario | Load calculation and reserved capacity |
| Service alteration proposed | Coordinate utility and city milestones | Approvals and inspection |
| Backup power requested | Define backed-up loads and controls | Commissioning and owner test |
Separate design, permits, utility coordination, array equipment, roof attachments, service or panel work, storage, trenching, finish restoration, monitoring and closeout. Compare incentives only from current program and tax guidance, and keep them outside the construction total unless the contract clearly assigns them.
No. The decision depends on service and panel condition, available capacity, design method and planned loads; require a documented assessment.
Coordinate replacement when roof condition and likely remaining life make later array removal foreseeable. Document the roofer and solar installer warranty boundaries.
Assign city, electrical and utility steps in writing to the responsible businesses. Confirm the actual address and design with the applicable authorities.
Only if the design and operating assumptions support the selected loads. List backed-up circuits, power limits and expected use rather than relying on a label.
Compare models using the same usage period, roof areas, shade, orientation, degradation and tree assumptions, and distinguish estimates from guarantees.
Follow inspection, interconnection and permission-to-operate requirements. Physical installation does not by itself authorize energization.
Yes, as a defined load scenario if it is reasonably planned. That can change service, panel, controls and array decisions.
Keep permits, utility approvals, one-line drawings, labels, serials, warranties, attachment photos, monitoring access and shutdown instructions.
Share usage, roof information, equipment photos and planned electric loads so licensed contractors can compare the same system boundary.
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