Path-Q Solar
Should I include a planned home addition in the solar design now?
Answer
Include the addition when its timing, size, equipment, and expected electricity use are reasonably defined. If those details are uncertain, design for the confirmed load while checking whether the roof, inverter, electrical service, and permits can accommodate a later expansion.
Key points
- Estimate the addition's heating, cooling, lighting, appliances, water heating, and occupancy loads.
- Check whether the addition will change roof area, shading, electrical service, or the location of equipment.
- A larger initial system may be efficient if the addition is imminent and the design can use the capacity.
- A later expansion may be preferable when the addition is speculative or current equipment and rules could change.
What it depends on
- Addition design and construction schedule
- Expected equipment and occupancy
- Roof and electrical changes
- Expansion compatibility of the initial system
Risks and trade-offs
- Including uncertain loads can increase upfront cost and unused capacity.
- Waiting can create design, equipment, roof-access, or interconnection limitations.
- A future addition may shade existing panels or require relocation.
Information you may need
- Addition plans and floor area
- Heating, cooling, water heating, and appliance plans
- Construction timing
- Electrical service and roof plans
Your next step
What to do next
Have the designer model current load, confirmed addition load, and expansion-ready alternatives before selecting the initial system size.
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