- Solar and energy
- Solar inverter
3501
SMA inverter event 3501
Risk level
Critical
Stop using the equipment and contact a professional.
Urgency
Immediate
Quick answer
SMA defines event 3501 as: DC-installation insulation resistance is or was too low, often from damaged insulation or a faulty PV connector and sometimes correlated with rain or dew. The useful next discriminator is the affected string, weather correlation and insulation trend. Preserve the event before any reset.
Safety first
What to do now
- Preserve the exact event context
Save event 3501, timestamp, inverter model/serial, firmware, red-LED state, affected phase/string, power and weather before clearing anything.
- Collect one safe discriminator
Leave feed-in stopped. Record the named string and whether the event follows rain, dew, wind or a recent roof/cable intervention; do not touch DC connectors. Record the affected string, weather correlation and insulation trend; do not change multiple parameters or circuits at once.
- Respect the electrical stop point
A cleared event is not proof that insulation is safe. Recurrence, especially with weather, requires per-string measurements before reconnection.
What you must never do
- Do not attempt this professional task: Measured handoff for SMA 3501
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 3501
What they doUnder the same weather conditions, isolate and measure each indicated string’s insulation resistance and voltages to PE, then inspect connectors, cable runs and modules before reconnecting.
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 3501
- evento SMA 3501
- inversor SMA 3501
- inverter SMA 3501
- onduleur SMA 3501
- SMA Ereignis 3501
- SMA event 3501
- SMA inverter 3501
- SMA Wechselrichter 3501
- Sunny Tripower X 3501
What it means
Official meaning: DC-installation insulation resistance is or was too low, often from damaged insulation or a faulty PV connector and sometimes correlated with rain or dew. Decision boundary: capture the affected string, weather correlation and insulation trend. Under the same weather conditions, isolate and measure each indicated string’s insulation resistance and voltages to PE, then inspect connectors, cable runs and modules before reconnecting.
Warnings and stop conditions
- Criticalsource verified
PV strings retain hazardous DC voltage in daylight even when the inverter is off. Do not unplug, test or handle strings or connectors.
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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