Path-Q Solar
Should a solar system be sized for my current electricity use or my expected future use?
Answer
Usually size the design around credible future electricity use when the change is reasonably certain and will occur within the system-planning horizon, while avoiding speculative loads. Compare current use, committed future loads, and uncertain possibilities separately, then consider whether the system and electrical equipment can be expanded later.
Key points
- Include planned EVs, heat pumps, electric water heating, additions, and other committed changes.
- Do not assume every possible future appliance or occupancy change will occur.
- Check physical roof area, inverter capacity, electrical service, and interconnection limits before relying on future expansion.
- A larger system is not automatically more valuable if surplus production has limited compensation.
What it depends on
- Certainty and timing of future loads
- Expected production and system expansion constraints
- Electricity import and export valuation
- Available capital and tolerance for paying for unused capacity
Risks and trade-offs
- Current-use sizing may understate future needs and make later expansion difficult.
- Future-use sizing can increase upfront cost and may produce excess energy if plans change.
- Annual sizing does not ensure that solar output matches consumption at the same time.
Information you may need
- Current bills and, if available, interval consumption
- Documented future projects and equipment specifications
- Roof, inverter, service, and interconnection limits
- Scenario-based quote with current and future load assumptions
Your next step
What to do next
Ask for a side-by-side design using current load, committed future load, and optional future load, including expansion constraints and financial assumptions.
Path-Q
Find the right next step
Answer a few questions and we’ll narrow your options.
Loading…
SQ01389