Path-Q Solar

How should irregular electricity use from a workshop affect solar sizing?

Answer

Irregular workshop use should be sized from interval consumption and equipment operating patterns rather than an average monthly bill alone. Frequent daytime loads may support direct solar use, while occasional or seasonal loads may require a smaller system, load shifting, storage, or acceptance of more exported energy.

Key points

  • Separate workshop consumption from household consumption if possible.
  • Identify high-power tools, heating, cooling, compressors, welders, and other intermittent loads.
  • Use measured usage and expected future operation rather than assuming every unusual peak will recur.

What it depends on

  • Workshop equipment power, duty cycle, and operating hours
  • Seasonal and monthly frequency of workshop use
  • Whether loads occur during solar production
  • Utility treatment of exported energy and any demand charges
  • Available service capacity and planned equipment additions

Risks and trade-offs

  • Sizing for rare peaks can oversize the array relative to usable annual consumption.
  • Sizing only from historical averages can miss planned equipment or seasonal operating changes.
  • Storage or automated load shifting may improve use of solar but adds cost and complexity.

Information you may need

  • At least several months of bills, preferably interval data
  • Workshop equipment list with power ratings and schedules
  • Planned changes in workshop use
  • Service-panel capacity and utility billing structure

Your next step

What to do next

Create a separate workshop load profile and ask for system scenarios based on current use, expected future use, and optional load shifting or storage.

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