Path-Q Solar

Should I install solar before or after switching from gas heating to electric heating?

Answer

There is no universal order. Install solar first when the project can reasonably accommodate the expected electric-heating load and the roof or project timing favors doing so; switch heating first when accurate load data, electrical capacity, or a near-term system redesign is more important. Compare both sequences and preserve a practical expansion option.

Key points

  • Heating first provides actual consumption data but may delay solar and leave interim electricity purchases.
  • Solar first can capture current and anticipated demand but relies on a forecast of heating use.
  • The design should account for electrical service, panel capacity, roof space, inverter limits, and future expansion.
  • The heating replacement schedule, roof condition, and project financing can change the preferred order.

What it depends on

  • Timing and certainty of the heating conversion
  • Estimated future heating load and current electricity use
  • Roof, inverter, electrical-service, and interconnection capacity
  • Project cost, financing, and applicable current program or tariff terms

Risks and trade-offs

  • Installing before electrification can produce an undersized system if the load estimate is too low.
  • Waiting can increase exposure to electricity costs and may make a later solar expansion harder.
  • A large system installed before the load exists may have lower immediate self-consumption.

Information you may need

  • Heating replacement plan and equipment estimate
  • Current bills and projected post-conversion consumption
  • Roof and electrical capacity
  • Comparable designs for each installation sequence

Your next step

What to do next

Ask for a written comparison of solar-first, heating-first, and staged approaches using the same load and project assumptions.

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