Path-Q Solar

What should I verify about export limits before choosing a system larger than my current usage?

Answer

Verify the utility's allowed export capacity, application rules, compensation structure, and any limits based on the property's service or account. A system larger than current usage may still be feasible, but excess generation could be curtailed, compensated differently, or require upgrades and controls.

Key points

  • Distinguish the system's DC size, inverter AC output, and the export limit approved at the point of interconnection.
  • Ask whether export limits apply to instantaneous output, annual energy, or both.
  • Model the economics under curtailment, self-consumption, storage, and different export compensation assumptions.

What it depends on

  • Utility interconnection rules and tariff
  • Service capacity and local circuit conditions
  • System inverter size and control equipment
  • Load profile, storage, and compensation for exported energy

Risks and trade-offs

  • A larger array may produce less economic value if exports are curtailed or poorly compensated.
  • Upgrades or export-control equipment can increase cost and delay approval.
  • Designing to annual usage alone may ignore seasonal production and instantaneous export limits.

Information you may need

  • Written utility export and interconnection limits
  • Site service information and recent electricity bills
  • Proposed array and inverter ratings
  • Production, load, and curtailment model

Your next step

What to do next

Obtain a preliminary interconnection review from the utility or qualified provider for the proposed inverter output and export level before finalizing the system size.

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Some details may depend on your location, installer, utility, incentives, regulations, or specific property.

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