Path-Q Solar
How should electricity use from a separately metered utility room be included when sizing solar for a home?
Answer
Include that consumption only if the solar system can legally and electrically serve the separate meter or if the applicable program allows its generation credits to be allocated to that meter. Otherwise, size the home system using the home's own usage and evaluate the utility-room meter separately.
Key points
- Combine consumption only after confirming the meters' electrical and billing relationship.
- Use enough bill history to distinguish normal utility-room use from temporary or unusual loads.
- A separate meter may have different rates, demand charges, or export treatment.
What it depends on
- Meter ownership, service connections, and electrical configuration
- Utility rules for shared generation, credit allocation, and interconnection
- Utility-room load profile, rate structure, and future equipment plans
Risks and trade-offs
- Including inaccessible load can over-size the system and overstate expected bill reduction.
- Excluding eligible load can under-size the system or miss a beneficial allocation arrangement.
- Combining meters may require electrical work, approvals, or changes to billing arrangements.
Information you may need
- At least a suitable history of bills for each meter
- Meter numbers, service diagrams, and utility-room equipment list
- Written confirmation of how solar output can be assigned or credited
Your next step
What to do next
Separate the loads by meter, ask the utility to confirm allowable allocation, and have the installer model system size under each permitted arrangement.
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Some details may depend on your location, installer, utility, incentives, regulations, or specific property.
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