Path-Q Solar
What battery size is appropriate when outage loads vary between weekdays and weekends?
Answer
Use a load profile that models weekday and weekend scenarios separately, then size for the backup objective that matters most rather than averaging the two. Compare the battery's usable energy and power output against each scenario, including charging opportunities and reserve requirements.
Key points
- Identify which loads differ by day type, such as work equipment, cooking, entertainment, or occupancy.
- Calculate both energy consumption over time and simultaneous power demand.
- Consider whether the battery must cover the highest-use day or only essential loads on unusual days.
- Evaluate load shifting, automatic load shedding, and a larger battery as alternative strategies.
What it depends on
- Weekday and weekend occupancy
- Load duration and peak demand
- Target backup duration
- Solar recharge potential and operating reserve
Risks and trade-offs
- Sizing for the highest-use day may leave capacity underused on ordinary days.
- Averaging usage can result in inadequate backup during the critical scenario.
- Load controls may reduce battery size but require planning and occupant cooperation.
Information you may need
- Interval or appliance-level consumption data
- Separate weekday and weekend load lists
- Critical-load priorities
- Expected solar production during outage conditions
Your next step
What to do next
Request a design comparison showing usable battery energy, inverter power, and expected runtime for representative weekday and weekend outage profiles.
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