29254 on a SMA Solar Technology AG Sunny Boy Smart Energy: The battery and PV power are not sufficient to supply the SPS load

What it means

The manual says: The battery and PV power are not sufficient to supply the SPS load.

Part involved: secure power supply / backup operation.

When it shows: The battery and PV power are not sufficient to supply the SPS load.

Likely causes:

• SMA corrective measures: Ensure that sufficient PV power is available. Ensure that the battery is charged correctly. Reduce the SPS load. 11.2 Calculating the insulation resistance The expected total resistance of the PV system or of an individual string can be calculated using the following formula: total The exact insulation resistance of a PV module can be obtained from the module manufacturer or the datasheet. For the resistance of a PV module an average value can be assumed: for thin-film PV modules approximately 4.

Is it safe?

The inverter keeps running with some functions stopped.

Resetting itself: yes.

Manual reset: Automatic when condition clears.

What you can check

• Read the event number and message in the SMA Energy app / Sunny Portal (ennexOS) or the inverter's web interface and note the date/time for your installer. A red LED on the inverter means an event has occurred.
• Reduce the load on the backup (SPS) supply and check the battery has charge in the app.

What the engineer will check

• Check backup/SPS parameter settings; confirm AC disconnection detection.

Who to ask for: Battery installer.

Certification: Qualified electrician competent in battery energy storage (IET Code of Practice for Electrical Energy Storage Systems); manufacturer-trained installer.

What you might notice

• Error code shown on inverter or app

Sources

• Operating manual SUNNY BOY SMART ENERGY 3.6/4.0/5.0/6.0/8.0/9.9 ↗ · SBSExx-50-BE-en-12 Version 1.2 · page 103 · Reviewed 24 September 2026

A code explains what the controller detected, not a confirmed root cause.

Reviewed: 24 September 2026