- Solar and energy
- Solar inverter
933
Sungrow 933 on SBR battery and inverter: high temperature
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
High
Quick answer
Sungrow code 933 (Battery alarm, along with Battery fault 707 and 733) means the ambient or SBR battery temperature exceeds the operating range. Check for nearby heat sources or poor ventilation, and switch off the battery if temperature exceeds 55 °C or if SOC drops below 3 %.
Safety first
Stop and check this first
- The SBR064-256 manual instructs switching off the battery if temperature exceeds 55 °C (restarting only below 40 °C) and switching it off immediately if SOC drops below 3 % to avoid over-discharge damage. Never open or modify the battery modules.
Safe checks you can perform
- Check code 933 (or 707 / 733) and battery temperature in iSolarCloud
- Look for nearby heat sources, direct sun or blocked ventilation
- Make sure SOC does not drop below 3 % if the alarm persists
Leave these tasks to a qualified professional
- Do not attempt this professional task: Battery module inspection and escalation to Sungrow if unresolved
- Do not attempt this professional task: Ambient temperature measurement and heat dissipation improvement
What a technician must be able to justify
Technician visit
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.
Battery module inspection and escalation to Sungrow if unresolved
What they doIf alarm 933 or faults 707/733 persist even when ambient temperature is well within the recommended 10 to 30 °C range, the technician checks the battery system for internal overheating and contacts Sungrow.
They must show youthe alarm log and battery temperature history in iSolarCloud.
In writingthe checks performed on the SBR battery modules and any Sungrow support reference.
Ambient temperature measurement and heat dissipation improvement
What they doThe installer measures the ambient temperature around the SBR battery, checks the battery temperature in iSolarCloud, and verifies clearances, ventilation and protection from heat sources or direct sun.
They must show youthe measured ambient temperature and the iSolarCloud battery temperature compared against the 0 to 55 °C (charge) and -20 to 55 °C (discharge) limits.
In writingthe measured temperatures, any ventilation or clearance improvements made, and confirmation that the battery is within operating range.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Check code 933 (or 707 / 733) and battery temperature in iSolarCloud
- Who:
- you, checking the iSolarCloud app or the hybrid inverter screen.
- How:
- open the fault details in iSolarCloud to confirm whether the active code is 933 (Battery alarm) or 707 / 733 (Battery fault) and check the battery temperature reading in the app.
- Result that matters:
- distinguishing a high-temperature alarm (933, 707, 733) from a low-temperature alarm (934, 708, 734, below 0 °C for charging or -20 °C for discharging).
- If code 933, 707 or 733 is shown:
- check the room temperature and look for nearby heat sources right away.
- If code 934, 708 or 734 is shown instead:
- the manual explains that the ambient or battery temperature has fallen below the lower limit.
- Evidence to keep:
- a screenshot of iSolarCloud showing code 933 (or 707/733), the battery temperature and the SOC.
Evidence: User Manual 3-Phase Hybrid Inverter SH5.0RT / SH6.0RT / SH8.0RT / SH10RT / SH5.0RT-20 / SH6.0RT-20 / SH8.0RT-20 / SH10RT-20 (SH5.0-10RT&SH5.0-10RT-20-UEN-Ver20-202212) · User Manual High Voltage LFP Battery SBR064 / SBR096 / SBR128 / SBR160 / SBR192 / SBR224 / SBR256 (SBR064-256-UEN-Ver22-202502)
Look for nearby heat sources, direct sun or blocked ventilation
- Who:
- you, inspecting the area around the SBR battery without opening any modules.
- How:
- measure the room temperature, check whether heaters, boilers, hot pipes or direct sunlight are heating the battery stack, and make sure the area has air circulation and no flammable materials nearby.
- Result that matters:
- finding the environmental cause pushing the battery above the recommended 10 to 30 °C range (and 55 °C maximum).
- If the ambient temperature exceeds 55 °C:
- section 10.2 of the SBR manual instructs switching off the battery and restarting it only after the temperature falls below 40 °C.
- If the room has cooled down and airflow is restored:
- Sungrow notes that the battery generally returns to normal automatically.
- Evidence to keep:
- a thermometer reading near the battery and a photo of the installation area.
Evidence: User Manual 3-Phase Hybrid Inverter SH5.0RT / SH6.0RT / SH8.0RT / SH10RT / SH5.0RT-20 / SH6.0RT-20 / SH8.0RT-20 / SH10RT-20 (SH5.0-10RT&SH5.0-10RT-20-UEN-Ver20-202212) · User Manual High Voltage LFP Battery SBR064 / SBR096 / SBR128 / SBR160 / SBR192 / SBR224 / SBR256 (SBR064-256-UEN-Ver22-202502)
Make sure SOC does not drop below 3 % if the alarm persists
- Who:
- you, watching the SOC indicator bars on the battery or the iSolarCloud app.
- How:
- check the current state of charge (SOC): table 9.1 of the SBR064-256 manual instructs switching off the battery system immediately if the issue persists for a long time and the SOC drops below 3 %.
- Result that matters:
- preventing over-discharge damage to the LiFePO4 battery while waiting for service.
- If alarm 933 persists for a long time or SOC drops below 3 %:
- switch off the battery system immediately and contact the installer or manufacturer.
- If the alarm clears once the room cools:
- improve ventilation or shading so the temperature stays within range.
- Evidence to keep:
- a log of when code 933 started and cleared, together with the observed SOC percentage.
Evidence: User Manual High Voltage LFP Battery SBR064 / SBR096 / SBR128 / SBR160 / SBR192 / SBR224 / SBR256 (SBR064-256-UEN-Ver22-202502)
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Solar and energy
- Brand
- Sungrow
- Product type
- Solar inverter
Known code variants
- alarma temperatura alta batería SBR Sungrow
- Sungrow 707
- Sungrow 733
- Sungrow 933
- Sungrow alarm 933
- Sungrow alarma 933
- Sungrow Battery Alarm 933
- Sungrow error 933 batería
- Sungrow error 933 battery
- Sungrow SBR battery high temperature alarm
What it means
In the Sungrow SBR064-256 high-voltage LFP battery user manual (section 9.1, pages 50 and 55), code 933 ('Battery alarm') and codes 707 and 733 ('Battery fault') indicate over-temperature: the battery operating temperature range is 0 to 55 °C for charging and -20 to 55 °C for discharging (with 10 to 30 °C recommended year-round). In the SH5.0-10RT hybrid inverter manual (page 137), group 932 to 935, 937 and 939 ('Battery Alarm') notes that the battery generally recovers automatically once heat dissipation conditions are improved. The code alone never proves that the battery modules are defective.
Warnings and stop conditions
- Highsource verified
The SBR064-256 manual instructs switching off the battery if temperature exceeds 55 °C (restarting only below 40 °C) and switching it off immediately if SOC drops below 3 % to avoid over-discharge damage. Never open or modify the battery modules.
Evidence: User Manual High Voltage LFP Battery SBR064 / SBR096 / SBR128 / SBR160 / SBR192 / SBR224 / SBR256 (SBR064-256-UEN-Ver22-202502)
Symptoms and causes
Probable causes · in order
- Heat source near the battery, direct sun or unventilated locationCommon
The SBR064-256 manual links code 933 (and faults 707 and 733) to the battery being placed near a heat source, in an unventilated environment, or in excessively high ambient temperature.
Evidence: User Manual 3-Phase Hybrid Inverter SH5.0RT / SH6.0RT / SH8.0RT / SH10RT / SH5.0RT-20 / SH6.0RT-20 / SH8.0RT-20 / SH10RT-20 (SH5.0-10RT&SH5.0-10RT-20-UEN-Ver20-202212) · User Manual High Voltage LFP Battery SBR064 / SBR096 / SBR128 / SBR160 / SBR192 / SBR224 / SBR256 (SBR064-256-UEN-Ver22-202502)
- Ambient or internal battery temperature exceeding 55 °CPossible
Section 9.1 and the technical data of the SBR064-256 manual set the upper operating limit at 55 °C for both charging (0 to 55 °C) and discharging (-20 to 55 °C); above 55 °C the battery stops charging or discharging.
Evidence: User Manual High Voltage LFP Battery SBR064 / SBR096 / SBR128 / SBR160 / SBR192 / SBR224 / SBR256 (SBR064-256-UEN-Ver22-202502)
Virtual technician
Does 933 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Sungrow Power Supply Co., Ltd. · 2023 · manual
- 2
Sungrow Power Supply Co., Ltd. · 2025 · manual
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