Path-Q Solar

What solar system size might suit a business with highly variable monthly usage?

Answer

There is no reliable size based only on average monthly usage. Start with interval consumption, identify the loads and months that matter most, and model several system sizes against roof capacity, export treatment, demand charges, and expected future use.

Key points

  • A system sized to the highest month may produce excess energy in lower-use months.
  • A system sized to average annual use may not minimize bills if demand charges or timing dominate.
  • Separate base loads, seasonal loads, and one-time or unusual consumption before sizing.
  • Model smaller, moderate, and larger systems rather than relying on a single offset percentage.
  • Include planned electrification, expansion, closures, or schedule changes.

What it depends on

  • Interval load profile and monthly variability
  • Demand charges and export treatment
  • Roof or site capacity and shading
  • Future business operations

Risks and trade-offs

  • Oversizing can increase capital cost and low-value exports.
  • Undersizing can leave savings available but unrealized.
  • Average annual usage can conceal timing and demand effects.

Information you may need

  • At least a year of bills and interval data if available
  • Operating schedule and seasonal business drivers
  • Demand-charge details and export terms
  • Planned changes in equipment or occupancy

Your next step

What to do next

Request an interval-based proposal with multiple system sizes and monthly production, consumption, export, and savings estimates.

Path-Q

Find the right next step

Answer a few questions and we’ll narrow your options.

Loading…

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

SQ00172