Path-Q Solar
What drawings and equipment specifications should a business submit for utility review of a nonstandard solar interconnection?
Answer
A nonstandard interconnection package typically needs a site plan, electrical one-line diagram, equipment data, protection and control details, operating description, and evidence that the proposed system can safely connect under the utility's process. The exact submission list must come from the serving utility and applicable requirements.
Key points
- The one-line should identify sources, inverters, transformers, disconnects, meters, protection, grounding, and points of connection.
- Equipment documentation should include inverter, module, transformer, switchgear, protection, and control specifications relevant to interconnection.
- The package may need load information, fault-current data, studies, commissioning procedures, and a description of export or non-export operation.
What it depends on
- Serving utility and interconnection application type
- System size, voltage, service configuration, and export behavior
- Existing generation, storage, transformers, and protection equipment
- Site layout, conductor routes, and point of common coupling
- Current utility, code, and technical-screen requirements
Risks and trade-offs
- Incomplete or inconsistent drawings can cause review delays, redesign, or additional study costs.
- A non-export design may still require controls, testing, and utility approval.
- Utility approval does not replace building, electrical, fire, or other required approvals.
Information you may need
- Utility interconnection handbook and application checklist
- Site plan, service information, and existing one-line
- Final equipment datasheets and certifications
- Protection, grounding, control, and anti-islanding details
- Load, fault-current, and export-control information
Your next step
What to do next
Ask the serving utility for its current nonstandard-interconnection checklist and have a qualified engineer prepare a coordinated submission package before equipment is ordered.
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Some details may depend on your location, installer, utility, incentives, regulations, or specific property.
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