Path-Q Solar

What risk does oversizing solar create when most of my electricity is exported?

Answer

Oversizing can leave a large share of production dependent on export treatment rather than on-site use. If exported energy is valued less than avoided purchases, the extra panels may add cost without proportional bill savings, and the result can be more sensitive to tariff, policy, or billing changes.

Key points

  • Compare expected production with hourly on-site consumption, not only annual consumption.
  • Separate the value of self-consumed energy from exported energy in the analysis.
  • Model current and plausible future export assumptions rather than assuming all generated energy has the same value.

What it depends on

  • System size and production profile
  • Hourly household or business load
  • Export compensation and bill structure
  • Future load growth or load shifting
  • Storage and equipment costs

Risks and trade-offs

  • The incremental system cost may have a weaker return than the portion serving on-site loads.
  • Changes to export rules or rates can affect the value of excess production.
  • A smaller system may reduce export exposure but provide less protection against future consumption growth.

Information you may need

  • Interval usage data
  • Production estimates for alternative system sizes
  • Current bill and export terms
  • Planned future loads and storage preferences

Your next step

What to do next

Request a marginal comparison showing cost, self-consumption, exports, and bill impact for several system sizes under verified current billing assumptions.

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SQ02654