- Solar and energy
- Solar inverter
2011
Huawei inverter 2011: a PV string is connected with reverse polarity
Risk level
Critical
Stop using the equipment and contact a professional.
Urgency
Immediate
Quick answer
Huawei alarm 2011 means a PV string is connected with reverse polarity. The deciding evidence is the exact string/cause ID and whether wiring or connectors were recently installed or changed. This is an installer-grade electrical alarm: do not infer or buy a component from the ID alone.
Safety first
What to do now
- Preserve the exact alarm context
Save a screenshot of 2011 with timestamp, cause ID, inverter model/serial, firmware, operating power, affected string/MPPT/phase and weather. Do not clear the alarm first.
- Collect the safe discriminator
Leave generation stopped if the alarm is active. Use only FusionSolar monitoring from a safe location; do not touch PV connectors, strings, DC switches or rooftop equipment. Record the exact string/cause ID and whether wiring or connectors were recently installed or changed; do not change several settings or circuits at once.
- Respect the electrical stop boundary
If it clears, that does not prove wiring or array configuration is safe; recurrence means keep the system off until the named DC branch is measured.
What you must never do
- Do not attempt this professional task: Measured installer handoff for 2011
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 installer handoff for 2011
What they doWait for the model’s safe DC conditions, isolate AC/DC, verify polarity at the disconnected string and correct only the identified branch under the installation procedure.
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
- Huawei
- Product type
- Solar inverter
Known code variants
- alarma Huawei 2011
- alarme Huawei 2011
- allarme Huawei 2011
- erreur SUN2000 2011
- error SUN2000 2011
- errore SUN2000 2011
- Huawei alarm 2011
- Huawei inverter 2011
- Huawei Wechselrichter 2011
- inversor Huawei 2011
- inverter Huawei 2011
- onduleur Huawei 2011
- SUN2000 error 2011
- SUN2000 Fehler 2011
What it means
Huawei’s official inverter alarm reference defines 2011 as a condition in which a PV string is connected with reverse polarity. It reports a controller/protection state, not a universal failed part. Record the exact string/cause ID and whether wiring or connectors were recently installed or changed. The next proof is measured: Wait for the model’s safe DC conditions, isolate AC/DC, verify polarity at the disconnected string and correct only the identified branch under the installation procedure.
Warnings and stop conditions
- Criticalsource verified
PV strings can remain at dangerous DC voltage in daylight even when the inverter is off. Do not disconnect, cover, probe or handle DC connectors or rooftop modules; use a qualified PV installer.
Evidence: Huawei Inverter Alarm Reference
Sources and technical references
- 1
Huawei Inverter Alarm Reference
Huawei Digital Power · 2025 · official_doc
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