Battery power cable connection is incorrect — battery may be unconnected, reversed, or have a wiring fault.
Common causes
Battery not connectedBattery power cable connected with reversed polarityLoose or disconnected battery power cable
What to check
STEP 1
SAFETY: De-energise system before inspecting. Check battery power cable is connected between inverter battery port and battery. Verify polarity — positive to positive, negative to negative.
STEP 2
Ensure cable is firmly seated and not loose.
Escalate if
Connection confirmed correct but fault persists — contact Sungrow support
Need full interactive diagnosis?
Faultpath walks you through decision trees, fault codes, and commissioning — built for solar & battery engineers.