Path-Q Solar
How should a small business account for export restrictions when comparing a larger array with a smaller self-consumption design?
Answer
Value the larger array only on the portion of generation the business can use, store, or export under confirmed grid and contract limits. If exports are capped, curtailed, or compensated poorly, a smaller system aligned with daytime load may provide better economics unless storage, load shifting, or approved export capacity makes the additional generation useful.
Key points
- Use interval load data to estimate how much generation is consumed on site by season and operating schedule.
- Model export limits, curtailment, interconnection delays, and any required controls.
- Include storage and load-shifting options, but account for their cost, losses, replacement, and operational burden.
- Separate the value of self-consumed energy from exported energy rather than applying one blended rate.
- Check whether future load growth is credible enough to justify excess capacity.
What it depends on
- Interval electricity consumption
- Array size and production profile
- Export limit and interconnection terms
- Storage and load-shifting capability
- Applicable compensation and bill structure
Risks and trade-offs
- A larger array can increase unused or curtailed output and lengthen payback.
- A smaller system may leave future savings unrealized if business load grows.
- Storage can increase usable solar value but adds cost, complexity, and degradation.
- Export rules and compensation may change, so assumptions need source and date tracking.
Information you may need
- Interval load and operating-hours data
- Proposed system production simulations
- Written export and curtailment limits
- Storage and load-management proposals
- Current bill and export-compensation terms
Your next step
What to do next
Ask the installer and grid operator for written export constraints, then compare systems using hourly self-consumption, curtailment, and export scenarios.
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Some details may depend on your location, installer, utility, incentives, regulations, or specific property.
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