Path-Q Solar
Does high daytime electricity use make a smaller solar system financially reasonable?
Answer
It can. High daytime electricity use often improves the economics of solar by allowing more generation to be consumed on-site, but it does not by itself mean a smaller system is best. A smaller system is financially reasonable when load matching shows it captures the most valuable daytime use without producing excess lower-value energy, given the available space, rates, and project cost.
Key points
- Directly consuming solar can be more valuable than exporting it under some bill structures.
- Use interval data to compare the property's load with expected solar production by hour.
- A smaller system may have lower upfront cost and better load alignment, but a larger appropriately matched system may create greater total savings.
- The design should account for weekends, seasonal changes, demand charges where applicable, and future usage changes.
What it depends on
- Hourly electricity load and solar production profile
- Electricity rates, demand charges where applicable, and export compensation
- Available installation area, shading, and project cost
- Usage schedule and future load changes
Risks and trade-offs
- A smaller system may leave economically valuable daytime load or future load growth unserved.
- High daytime demand does not guarantee high solar use if the load is concentrated outside production hours.
- Savings may be overstated if usage timing, demand-charge effects, or export terms are ignored.
Information you may need
- Interval electricity data and usage schedule
- Rate and demand-charge details where applicable
- Site and production assessment
- Proposed system sizes and financial assumptions
Your next step
What to do next
Ask for a comparison of smaller and larger systems using interval load matching and the property's actual rate structure.
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