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SMA•Sunny Boy Storage

Analysis by Marcus & Team

SMA Sunny Boy Storage: Battery Not Found Error

Troubleshoot the SMA Sunny Boy Storage 'Battery Not Found' error. Diagnose battery connection issues, BMS faults, and inverter communication problems.

Frequently Asked Questions

•What type of battery is compatible with SMA Sunny Boy Storage?

SMA Sunny Boy Storage inverters are compatible with specific lithium-ion batteries. Refer to SMA's compatibility list for approved battery models.

•How do I access the SMA Sunny Portal to monitor my system?

Visit the SMA Sunny Portal website and create an account. You'll need your system's registration number to add your inverter to the portal.

•What is the typical lifespan of a battery used with the SMA Sunny Boy Storage?

The lifespan of a battery varies based on usage and battery chemistry, but most lithium-ion batteries are designed for 10 years or 3000-5000 cycles.

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Marcus leads the technical research department at Storage Faults. Together with a team of systems analysts, he specializes in translating complex solar storage error codes into actionable diagnostic steps for the US market.

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Technical Recommendation:

Access the SMA Sunny Boy Storage inverter's event log through the Sunny Explorer software. The event log may contain more detailed error information and timestamps that can help pinpoint the cause of the 'Battery Not Found' error. Also, check the inverter's DC bus voltage to verify proper voltage levels during operation.

Technical Overview:

The SMA Sunny Boy Storage is a hybrid inverter that manages power flow between PV panels, the grid, and a battery. The inverter uses MPPT to maximize DC power from the solar array, converts DC to AC for grid export/home consumption, and manages battery charging/discharging based on SOC and system demand. Battery communication relies on a CAN bus or similar protocol. A 'Battery Not Found' error indicates a failure in this communication or a critical battery fault.

Safety Warning:

High DC voltage is present in the PV array and battery circuits. Only qualified electricians should perform troubleshooting or maintenance. Always disconnect DC power before working on any components. Arc flash hazards exist. Follow all NEC guidelines and manufacturer safety procedures. Wear appropriate PPE, including arc-rated clothing and gloves.

Common Causes:

Step-by-Step Fix:

1

*Safety First**: Ensure the PV array is disconnected using the DC disconnect switch. Engage the NEC-compliant rapid shutdown system per NEC 2017/2020 requirements.
2

*Visual inspection**: Check all battery connections for looseness, corrosion, or damage. Use a multimeter to verify voltage at the battery terminals.
3

*Communication Cable Test**: Inspect the battery communication cable for damage. Use a multimeter to test for continuity and shorts according to the battery manufacturer's specifications.
4

*BMS Check**: If possible, access the BMS directly (if the battery has an accessible interface) to check for error codes or warnings.
5

*Inverter Firmware Update**: Use the SMA Sunny Portal or Sunny Explorer software to update the inverter firmware to the latest version.
6

*Battery Compatibility Verification**: Confirm that the battery is listed as compatible with the SMA Sunny Boy Storage inverter in the manufacturer's documentation.
7

*Contact SMA Support**: If the issue persists, contact SMA technical support for further assistance. Provide the inverter serial number and detailed error information.

Observed Symptoms:

The SMA Sunny Boy Storage hybrid inverter displays a 'Battery Not Found' error in the installer menu or monitoring interface. The system will operate in grid-tie mode but will not charge or discharge the battery. Battery SOC will not be displayed.

Preventative Care:

Schedule annual inspections of battery connections to check for corrosion and tightness.
Regularly update the inverter firmware to the latest version.
Monitor battery SOC and SOH through the SMA Sunny Portal or Sunny Explorer.
Perform a battery capacity test every 2-3 years to assess battery health.