Safety: Keep the enclosure closed. Never bridge output terminals, bypass protective cutoffs or probe the internal battery/inverter. Disconnect external devices before inspecting plugs. Stop if a connector is melted, wet or physically damaged. Solar DC wiring can arc. Cover panels and use installer-approved isolation; never unplug loaded MC4 connectors. Do not make live high-voltage measurements unless qualified.
Applies to this exact equipment
AC180 only. Confirm the AC180 nameplate and regional AC outlet voltage; AC180P/AC180T specifications must not be substituted. The error names here are from the AC180 User Manual, §5.2.
Version check: Check AC180 versus AC180P: ratings, wiring and error-code tables may differ.
DIAGNOSE THE CAUSE · APPLY THE FIX · CONFIRM THE RESULT
Find the cause and fix it
Jump to your symptom: 01 · PV charging stops with E03302 · Several panels are wired in series03 · E033 persists on a verified compliant panel
01
PV charging stops with E033
HOW TO CHECK & CORRECT THIS CAUSE
- Disconnect solar input.
- Compute string open-circuit voltage at expected coldest conditions from the solar panel datasheet.
- Do not let PV open-circuit input exceed AC180's specified 12–60V DC input range.
How to tell it is fixed: A compliant panel/string charges with no E033.
02
Several panels are wired in series
HOW TO CHECK & CORRECT THIS CAUSE
- Reconfigure the array using a panel/string arrangement whose cold-weather VOC and polarity are in the AC180's input specification.
- Do not connect first and check afterward.
How to tell it is fixed: Solar icon and input watts appear with no overvoltage trip.
03
E033 persists on a verified compliant panel
HOW TO CHECK & CORRECT THIS CAUSE
- Check matching connectors/cable for incorrect polarity or wiring.
- Authorized PV controller/service diagnosis is required if verified input stays in range yet trips.
How to tell it is fixed: Charging resumes with stable specified input.
Technical reference and applicability
Source: Source manual or manufacturer model specifications ↗
Applicable sections: §3.2 DC input 12–60 V / 10 A / 500 W; §4.3.2 Solar Charging; §5.2 E033
The step order and owner-level isolation sequence are editorial diagnostics based on the cited facts; they are not represented as a quoted factory repair procedure. Never assume an internal repair part is compatible without revision-specific documentation.