Path-Q Solar
When should I compare a solar design with energy-efficiency improvements before committing to panels?
Answer
Compare them before committing whenever the building has substantial heating, cooling, insulation, air-sealing, lighting, appliance, or load-management opportunities, or when the solar design is based on current consumption that may change after improvements.
Key points
- Efficiency can reduce the system size needed to meet a target load.
- Some improvements may improve comfort and reliability as well as reduce consumption.
- Solar may still be appropriate after efficiency work if meaningful electricity use remains.
- Compare measures using expected energy savings, useful life, upfront cost, disruption, and interaction with the solar design.
What it depends on
- Current and future electricity use
- Building condition and planned renovations
- Local energy prices, financing, incentives, and export or bill-credit rules
Risks and trade-offs
- Efficiency work can delay solar and may have its own uncertain savings.
- Installing solar first can result in oversizing if consumption later falls.
- Focusing only on payback can overlook comfort, resilience, maintenance, and non-energy benefits.
Information you may need
- At least 12 months of utility data where available
- A list of planned building improvements
- An energy assessment or measured load profile
- Comparable solar designs before and after expected efficiency changes
Your next step
What to do next
Ask for an efficiency-first scenario and a solar-plus-efficiency scenario using the same documented load assumptions.
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