Path-Q Solar
How can I estimate my home's electricity baseload before choosing a solar system size?
Answer
Estimate baseload by identifying the electricity used continuously or regularly when major discretionary loads are off, then compare that estimate with interval or monthly consumption data. Smart-meter interval data, if available, is more useful than dividing an annual bill evenly because it shows overnight and low-activity demand.
Key points
- Baseload commonly includes refrigeration, networking equipment, standby devices, pumps, ventilation, and other continuously operating equipment.
- Review overnight usage and periods when the home is unoccupied to distinguish recurring demand from occasional loads.
- Use several representative days or weeks rather than relying on one unusual day.
- Baseload helps evaluate self-consumption and battery needs but does not by itself determine total annual solar size.
What it depends on
- Availability and resolution of interval electricity data
- Which appliances operate continuously
- Season, occupancy, and weather
- Whether heating, cooling, water heating, or pumps are included in the measurement
Risks and trade-offs
- A short measurement period can misrepresent seasonal or intermittent loads.
- A high apparent baseload may indicate an inefficient or faulty appliance rather than a permanent need.
- Sizing solar to cover baseload alone can understate total annual consumption.
Information you may need
- At least several months of bills or interval data
- Overnight or unoccupied-period consumption
- A list of continuously operating equipment
- Major seasonal loads and planned changes
Your next step
What to do next
Collect interval data or record meter readings during representative low-activity periods, then separate recurring demand from occasional and seasonal loads.
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