Path-Q Solar

What electricity-usage and production data should a business use to size solar when production volume varies seasonally more than operating hours do?

Answer

Use time-matched electricity consumption, production volume, and operating data for all seasons, rather than assuming operating hours represent load. Relate energy use and peak demand to units produced, then size solar against the intended bill-offset, export, or resilience objective.

Key points

  • Collect at least a year of bills and interval data, preferably covering high- and low-production periods.
  • Track monthly or weekly production volume, process throughput, shifts, equipment use, and weather-sensitive loads.
  • Separate fixed base load from production-related consumption and identify seasonal peak demand.
  • Evaluate how solar generation timing aligns with the business's seasonal and hourly consumption.

What it depends on

  • Production volumes and schedules by season
  • Interval consumption and demand data
  • Process-specific energy intensity
  • Future production plans and the intended treatment of exports or storage

Risks and trade-offs

  • Sizing from annual energy alone can overproduce during low-production periods or miss demand-cost exposure.
  • Historical seasonal patterns may not represent planned expansion or contraction.
  • A system optimized for energy offset may not reduce the relevant peak demand.

Information you may need

  • Utility bills and interval data
  • Production records and operating schedules
  • Major equipment loads and planned changes
  • Solar design assumptions and objective

Your next step

What to do next

Build a seasonal load profile linking kWh, peak demand, and production volume, then ask a designer to model solar output against that profile.

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