Path-Q Solar

Can a battery have a positive financial return if I rarely lose grid power?

Answer

Yes, potentially through time-based rate shifting or avoiding low-value exports, but the return depends on the tariff spread and cycling value; backup alone is unlikely to justify it if outages are rare.

Key points

  • Calculate round-trip losses and degradation.
  • Use actual hourly prices and load timing.
  • Value resilience separately from direct financial return.

What it depends on

  • Tariff structure
  • Battery cost and efficiency
  • Solar export value and cycling frequency

Risks and trade-offs

  • Small price spreads may not cover battery cost.
  • Frequent cycling consumes warranted life.

Information you may need

  • Time-varying rates
  • Hourly load and solar
  • Battery warranty and installed price

Your next step

What to do next

Run a dispatch model using actual rates and conservative degradation assumptions.

Path-Q

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

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