- Solar and energy
- Solar inverter
714
Sungrow 714 on hybrid inverter and battery: BMS link fault
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
High
Quick answer
Sungrow code 714 (BMS Communication Fault) means the SH hybrid inverter and SBR battery have lost CAN communication. Check the alarm details and battery state of charge (SOC) in iSolarCloud, leave the cables alone, and switch off the battery immediately if SOC drops below 3 %.
Safety first
Stop and check this first
- Never pull out any cables when the battery is powered on or open the inverter enclosure: Sungrow warns of electric shock hazards and instructs switching off the battery system immediately if the SOC drops below 3 % to avoid over-discharge damage.
Safe checks you can perform
- Confirm code 714 in iSolarCloud and check the status LEDs
- Watch the battery SOC bars so the battery does not over-discharge
- Do not pull or touch cables and call the installer
Leave these tasks to a qualified professional
- Do not attempt this professional task: Meter communication cable reconnection and Sungrow support escalation
- Do not attempt this professional task: Inspection and replacement of the battery-to-inverter communication cable
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.
Meter communication cable reconnection and Sungrow support escalation
What they doThe technician reconnects the communication cable of the meter on the hybrid inverter as listed in the SH5.0-10RT table and contacts Sungrow or the manufacturer if fault 714 persists.
They must show youthe meter communication terminal connection and the iSolarCloud status with battery communication restored.
In writingthe connections checked, the battery SOC reading, and any Sungrow service reference.
Inspection and replacement of the battery-to-inverter communication cable
What they doAfter powering down the system per the manual, the installer checks whether the communication cable and terminals between the SBR battery and the hybrid inverter are loose or miswired, and replaces the cable if code 714 remains.
They must show youthe communication plugs and terminals at both ends and the replacement cable if one was fitted.
In writingwhether a terminal was loose or miswired, whether the CAN cable was replaced, and that code 714 cleared.
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.
Confirm code 714 in iSolarCloud and check the status LEDs
- Who:
- you, using the iSolarCloud app and looking at the inverter and battery from outside.
- How:
- tap the fault icon in the upper left corner of the iSolarCloud screen to read the 714 details, and check the inverter front LED (steady red means a system fault) and the SBR battery status indicator (steady or blinking red means a fault).
- Result that matters:
- verifying that code 714 (BMS Communication Fault) is the active code and logging when it started.
- If code 714 is shown in the app:
- save a screenshot and check the battery state of charge (SOC) right away.
- If a different 700, 800 or 900 code is displayed:
- record that exact number because Sungrow gives different steps for each group.
- Evidence to keep:
- a screenshot of the 714 alarm in iSolarCloud and a photo of the inverter and battery LEDs.
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)
Watch the battery SOC bars so the battery does not over-discharge
- Who:
- you, reading the SOC indicator on the SBR battery or in iSolarCloud.
- How:
- according to the SBR064-256 manual, each bar on the SOC indicator represents 10 % SOC, and if the issue persists and the SOC drops below 3 % you must switch off the battery system immediately.
- Result that matters:
- preventing permanent over-discharge damage while the battery cannot communicate with the hybrid inverter.
- If the SOC is well above 3 %:
- leave the enclosures closed and contact your installer to inspect the communication cable.
- If the SOC falls below 3 % or the fault persists with a nearly empty battery:
- switch off the battery system immediately as Sungrow instructs and call your installer urgently.
- Evidence to keep:
- a photo of the battery SOC indicator bars and the last SOC reading in iSolarCloud.
Evidence: User Manual High Voltage LFP Battery SBR064 / SBR096 / SBR128 / SBR160 / SBR192 / SBR224 / SBR256 (SBR064-256-UEN-Ver22-202502)
Do not pull or touch cables and call the installer
- Who:
- you, without disconnecting any plugs or opening the battery switch gear.
- How:
- the SBR manual warns never to pull out any cables while the battery is powered on and notes that all electrical terminals sit inside the switch gear; leave terminal work to the installer.
- Result that matters:
- having a qualified technician inspect the CAN and meter connections after a safe power-down.
- If you can see obvious external damage to the conduit or cable without touching it:
- take a photo for the installer.
- If nothing looks damaged on the outside:
- let the installer know so they can test the communication cable and terminals.
- Evidence to keep:
- exterior photos of the cable run between the SH hybrid inverter and the SBR battery.
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)
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 714 inversor híbrido Sungrow
- fallo comunicación BMS Sungrow
- Sungrow 714
- Sungrow alarm 714
- Sungrow BMS communication error
- Sungrow BMS Communication Fault
- Sungrow error 714
- Sungrow fallo 714 batería SBR
- Sungrow SBR battery fault 714
What it means
In the Sungrow SH5.0-10RT three-phase hybrid inverter user manual (section 10.1, page 137), alarm 714 is titled 'BMS Communication Fault', and in the SBR064-256 high-voltage LFP battery user manual (section 9.1, page 51), code 714 is listed under 'Battery fault'. Both manuals point to an abnormal, loose or faulty communication cable or terminal connection between the battery and the inverter (CAN interface), as well as the meter communication cable on the hybrid inverter. Code 714 alone never proves that the battery or the inverter hardware is defective.
Warnings and stop conditions
- Highsource verified
Never pull out any cables when the battery is powered on or open the inverter enclosure: Sungrow warns of electric shock hazards and instructs switching off the battery system immediately if the SOC drops below 3 % to avoid over-discharge damage.
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)
Symptoms and causes
Probable causes · in order
- Communication cable or terminals between battery and inverter loose or miswiredCommon
Both the SH5.0-10RT inverter manual and the SBR064-256 battery manual list an incorrectly or loosely connected communication cable or terminal between battery and inverter as the primary cause of 714.
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)
- Damaged communication cable needing replacementPossible
The SBR064-256 battery manual instructs replacing the communication cable between the battery and the inverter if checking the connection does not clear fault 714.
Evidence: User Manual High Voltage LFP Battery SBR064 / SBR096 / SBR128 / SBR160 / SBR192 / SBR224 / SBR256 (SBR064-256-UEN-Ver22-202502)
- Meter communication cable connection at the hybrid inverterPossible
In the SH5.0-10RT hybrid inverter troubleshooting table for alarm 714, the second corrective measure is to reconnect the communication cable of the meter.
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)
Virtual technician
Does 714 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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