Path-Q Solar
Should battery capacity be based on average use or the highest-use evening?
Answer
Usually, size around the normal target use and define separately how much high-use demand should be covered. Sizing for the highest evening gives more resilience but can leave substantial capacity underused, while sizing only to the average may provide less coverage during unusual demand or outages.
Key points
- Use interval data to distinguish typical, high-use, and critical-load consumption.
- For bill shifting, average or target-period use is often the relevant basis.
- For backup, critical loads and the desired duration matter more than whole-home peak consumption.
- A reserve or operating strategy can address occasional high-use events without sizing for the absolute maximum.
What it depends on
- Battery purpose
- Typical and high-use evening consumption
- Critical-load requirements
- Battery power and usable-energy limits
Risks and trade-offs
- Average-use sizing may not cover unusual evenings or extended outages.
- Peak-use sizing can increase cost for infrequent events.
- Energy capacity alone may not support simultaneous high-power loads.
Information you may need
- Several weeks or months of interval data
- Loads that must operate during an outage
- Desired duration and reserve
- Battery power rating
Your next step
What to do next
Define the target—daily bill management, typical backup, or high-use resilience—and compare battery sizes against typical and high-use profiles.
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SQ00704