Path-Q Solar
When is a smaller solar system the better choice because my future electricity use is uncertain?
Answer
A smaller system can be better when future demand is speculative, financing or cash flow is tight, usable space is limited, or excess generation has uncertain value. It is less compelling when planned loads are well documented and adding capacity later would be difficult or expensive.
Key points
- Separate committed future loads from possibilities such as a future vehicle or heat pump.
- Compare the cost of installing capacity now with the cost and feasibility of adding it later.
- Check how system size affects fixed project costs, equipment configuration, and expansion capability.
- Evaluate expected use of the energy rather than assuming all future production has equal value.
What it depends on
- Confidence in future load growth
- Expansion limits of the roof and electrical system
- Treatment of excess generation
- Fixed and variable project costs
Risks and trade-offs
- Undersizing may require a second project with duplicated mobilization or equipment costs.
- Oversizing can tie up capital and produce energy that is less valuable to the owner.
- A smaller initial system may limit future expansion if the design is not planned for it.
Information you may need
- Current and projected electricity use
- Timing and certainty of new loads
- Expansion-ready design details
- Comparable costs for smaller, larger, and staged systems
Your next step
What to do next
Ask for staged, current-load, and future-load designs with explicit assumptions about expansion and the value of surplus energy.
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