- Solar and energy
- Solar inverter
4301
SMA inverter event 4301
Risk level
Critical
Stop using the equipment and contact a professional.
Urgency
Immediate
Quick answer
SMA defines event 4301 as: AFCI detected a serial electric arc in the indicated PV string; recurring arcs can lead to fire. The useful next discriminator is the exact AFCI string, recurrence count and last safe operating state. Preserve the event before any reset.
Safety first
What to do now
- Preserve the exact event context
Save event 4301, timestamp, inverter model/serial, firmware, red-LED state, affected phase/string, power and weather before clearing anything.
- Collect one safe discriminator
Do not reset AFCI or re-enable feed-in. Preserve the exact string identifier and keep the system out of service for qualified inspection. Record the exact AFCI string, recurrence count and last safe operating state; do not change multiple parameters or circuits at once.
- Respect the electrical stop point
Treat even one confirmed arc event as a stop condition; repeated resets can turn a connector or cable defect into a fire.
What you must never do
- Do not attempt this professional task: Measured handoff for SMA 4301
What a technician must be able to justify
A technician is coming
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Measured handoff for SMA 4301
What they doSafely isolate the indicated string, inspect and test its connectors, junctions, cable and modules, and document the found defect before the authorized AFCI restart.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Solar and energy
- Brand
- SMA
- Product type
- Solar inverter
Known code variants
- événement SMA 4301
- evento SMA 4301
- inversor SMA 4301
- inverter SMA 4301
- onduleur SMA 4301
- SMA Ereignis 4301
- SMA event 4301
- SMA inverter 4301
- SMA Wechselrichter 4301
- Sunny Tripower X 4301
What it means
Official meaning: AFCI detected a serial electric arc in the indicated PV string; recurring arcs can lead to fire. Decision boundary: capture the exact AFCI string, recurrence count and last safe operating state. Safely isolate the indicated string, inspect and test its connectors, junctions, cable and modules, and document the found defect before the authorized AFCI restart.
Warnings and stop conditions
- Criticalsource verified
A DC arc can ignite a fire. Do not reset protection, unplug connectors or approach damaged/smoking equipment.
Evidence: SMA Sunny Tripower X event messages
Sources and technical references
- 1
SMA Sunny Tripower X event messages
SMA Solar Technology AG · 2026 · official_doc
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