Path-Q Solar
Can solar be sized accurately for a newly built home with no utility history?
Answer
Yes, but the result is a forecast rather than a bill-based measurement. The estimate should use the home's size and envelope, climate, occupancy, planned appliances, heating and cooling systems, water heating, and expected behavior, with conservative assumptions for uncertain loads.
Key points
- A modeled load can be useful when no historical bills exist.
- Heating, cooling, water heating, and future EV charging can dominate the estimate.
- Building efficiency and equipment specifications are more important than floor area alone.
- A range of outcomes is more credible than a single precise consumption number.
What it depends on
- Building envelope and climate
- Occupancy and usage assumptions
- Heating, cooling, water-heating, and appliance choices
- Future loads and expected operating schedules
Risks and trade-offs
- Actual consumption may differ materially from the model.
- Oversizing based on maximum assumptions can reduce value if the home is efficient.
- Undersizing can occur if future electrification or occupancy is omitted.
Information you may need
- Construction and energy-performance details
- Mechanical and appliance specifications
- Expected occupants and schedules
- Plans for EVs, additions, and other electric loads
Your next step
What to do next
Request a documented load model with low, expected, and high-use scenarios, and plan to review the design after the home develops actual consumption history.
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SQ01615