Path-Q Solar
How should a business decide whether to repair a failed inverter or replace an aging solar system?
Answer
Compare the fully documented repair option with replacement on a remaining-life, reliability, downtime, and total-cost basis. Repair is more attractive when the rest of the system is sound and the inverter has meaningful remaining support; replacement becomes more attractive when failures are recurring, equipment is obsolete, or a larger upgrade materially improves reliability or capacity.
Key points
- Obtain a fault diagnosis rather than assuming the inverter alone is the cause.
- Compare repair cost, lead time, warranty, expected life, and compatibility with the existing array.
- Assess the age and condition of modules, racking, wiring, protection equipment, monitoring, and roof.
- Model lost production during each option and include disposal, permitting, interconnection, and commissioning costs.
What it depends on
- Cause and severity of the failure
- System age, design, and component condition
- Availability of compatible parts and service support
- Electricity value, operating requirements, and replacement scope
Risks and trade-offs
- A low-cost repair may lead to repeated outages if other components are near failure.
- Full replacement costs more and may require broader approvals or downtime.
- A replacement may change system capacity, controls, warranties, or grid requirements.
Information you may need
- Independent diagnostic report
- Repair and replacement quotes with warranties
- System production and failure history
- Equipment age and compatibility information
- Cost of downtime and value of expected production
Your next step
What to do next
Obtain one diagnostic report and comparable repair and replacement proposals, then compare expected five- to ten-year cost and reliability with the business's adviser.
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