Path-Q Solar
Should I size solar for my current electricity use or planned home additions?
Answer
Size around current use plus planned additions only when those additions are sufficiently defined and likely. Compare a current-load design, a future-load design, and the practical option of installing in stages or leaving capacity for expansion.
Key points
- A planned addition should be translated into estimated annual and peak electricity demand.
- Future electric heating, cooling, water heating, and EV charging can matter more than the added floor area.
- The roof, inverter, service, and interconnection may limit future expansion.
- Document assumptions about timing and equipment efficiency.
What it depends on
- Certainty, timing, and scope of the addition
- Expected equipment and heating choices
- Roof and electrical capacity
- Ability to expand the system later
- Value of excess generation
Risks and trade-offs
- Sizing for an uncertain project can increase cost and leave capacity unused.
- Waiting may expose the project to different equipment, labor, or financing conditions.
- A system sized only for current use may require later electrical work to support expansion.
Information you may need
- Addition plans and expected completion date
- Expected square footage and appliances
- Heating, cooling, and water-heating plans
- Future EV or other major loads
- Installer's expansion and inverter-capacity options
Your next step
What to do next
Request side-by-side designs for current use, expected post-addition use, and staged expansion.
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