Path-Q Solar

How should I compare a production guarantee with an equipment warranty?

Answer

A production guarantee concerns how much energy the system is expected to deliver under defined conditions, while an equipment warranty generally covers defects or failures in specified components. Compare them separately: verify the production calculation, measurement method, exclusions, remedy, and claim process, then compare the equipment warranty's component, labor, and service coverage.

Key points

  • Production guarantees may use modeled output, metered output, or another defined measurement.
  • Check whether shading, weather, outages, curtailment, degradation, maintenance, or grid limits are excluded.
  • Identify whether the remedy is cash, repair, replacement, extra equipment, or a production shortfall payment.
  • An equipment warranty does not normally promise a particular energy yield.

What it depends on

  • The contract's production baseline and degradation assumptions
  • The monitoring and measurement method
  • The scope and exclusions of each equipment warranty

Risks and trade-offs

  • A production guarantee may offer little protection if exclusions cover common causes of lower output.
  • A strong equipment warranty may replace failed parts without compensating lost production.
  • Higher guaranteed output may reflect more optimistic assumptions rather than better equipment.

Information you may need

  • The annual production schedule and calculation assumptions
  • The exact shortfall remedy and claim procedure
  • Manufacturer and installer warranty documents, including labor coverage

Your next step

What to do next

Ask each installer to apply the same production scenario and failure scenario to its documents, then compare the actual remedy and expected homeowner cost.

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