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What response times should a solar O&M SLA guarantee?
In short: A solar O&M SLA should guarantee response times based on how serious the fault is, not just how big the system is. A safety-critical issue should get an initial remote response within about 1 hour and an onsite start the same day; lower-priority issues scale down from there. The schedule must be written into the contract, aligned to IEC 62446-2, and backed by round-the-clock monitoring.
Severity first, size second
It’s tempting to think a bigger system deserves faster response. In practice, severity is what should drive the clock: a safety or fire risk needs an immediate response whether it’s a 40 kW roof or a 2.5 MW park. Size sets the stakes (how much yield is at risk per hour), but the response tier should follow the nature of the fault.
That’s why a good SLA is a severity matrix, not a single number.
A typical response-time schedule
The schedule below is the kind that forms part of an O&M service agreement, covering initial remote response and onsite correction start by priority:
| Priority | Example issue | Initial remote response | Onsite correction start |
|---|---|---|---|
| Critical | Safety / fire / life-threatening | 1 hour | 8 hours |
| High | Power failure; inverters offline (>75%) | 3 hours | 12 hours |
| Medium | Partial inverter/string loss; comms failure | 12 hours | 24 hours |
| Low | Minor inverter loss (<25%) | 24 hours | 48 hours |
Times are indicative of a bank-grade, IEC 62446-2-compliant schedule; the exact figures belong in your contract.
What to check in an SLA
- Is it written down? A verbal “we’ll come quickly” is not an SLA.
- Is it severity-based? One flat response time either overpays for minor issues or underprotects against critical ones.
- Does it separate remote from onsite? Most issues are triaged remotely first; the SLA should commit to both.
- Is 24/7 monitoring behind it? A response clock is meaningless if no one is watching to start it.
- What starts the clock? Detection time matters. Engineer-triaged alarms beat waiting for you to notice.
Bottom line
The value of an SLA is not the promise of speed. It’s the certainty of it, in writing, matched to severity. When something breaks, you should already know exactly how fast it gets handled.
Our solar PV O&M agreements carry a written, downloadable response-time schedule. To see how it would apply to your site, book an O&M assessment.
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