Path-Q Solar
How should I compare a system that maximizes self-consumption with one that maximizes grid exports?
Answer
Compare the value of each kilowatt-hour when used on-site with the compensation for exporting it, while accounting for system cost, battery cost, load timing, and export limits. The better design is the one with higher risk-adjusted net value, not necessarily the one producing or exporting the most energy.
Key points
- On-site use may avoid a retail charge, while exported energy may receive a different and lower value.
- Load shifting, energy efficiency, battery operation, and system orientation can change self-consumption.
- Export-focused designs may face interconnection limits or changing compensation.
- Include fixed charges, demand charges where relevant, degradation, and battery replacement.
What it depends on
- Consumption profile and time of use
- Retail and export compensation rules
- Interconnection export limit
- System and storage cost
Risks and trade-offs
- Maximizing self-consumption may require storage or controls that add cost and losses.
- Maximizing exports increases exposure to tariff changes and curtailment.
- Oversizing for exports can reduce marginal value if compensation is low.
Information you may need
- Interval or monthly load data
- Current tariff and export terms
- System production options and storage assumptions
- Interconnection limits and upgrade costs
Your next step
What to do next
Compare at least two designs using hourly or representative load modeling and the current export terms, then stress-test lower export compensation.
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Some details may depend on your location, installer, utility, incentives, regulations, or specific property.
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