Path-Q Solar
What happens to solar ROI if the system produces less than the quote predicts?
Answer
Lower production generally reduces bill savings and lengthens payback, while fixed costs remain largely unchanged. The severity depends on the size and duration of the shortfall, the value of exported energy, financing costs, and whether the contract provides a meaningful performance remedy.
Key points
- Test several production levels rather than treating the quoted estimate as certain.
- Check whether the estimate accounts for shading, orientation, temperature, soiling, degradation, outages, and system losses.
- Compare expected production with measured performance using monitoring data after installation.
What it depends on
- Production estimate and modeling assumptions
- Utility tariff, self-consumption, and export value
- System cost, financing, and fixed operating costs
- Guarantees, warranties, and remedies for underperformance
Risks and trade-offs
- A percentage production shortfall can have a larger effect on a marginal project than on a highly profitable one.
- A production guarantee may not compensate for all lost bill savings or may use a different measurement period.
- Correcting underperformance may involve delay, access, or dispute costs.
Information you may need
- Detailed production estimate and shading analysis
- Contractual guarantee, exclusions, and claim process
- System monitoring plan and expected monthly savings
Your next step
What to do next
Run low-production sensitivity cases and identify in writing how any shortfall will be measured, corrected, and compensated.
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SQ00733