7. Turn the DC load-break switch to the position I.
8. Switch on the circuit breaker of all three line conductors.
☑ All three LEDs start to glow and the start-up phase begins. The start-up phase may take
several minutes.
☑ The green LED is glowing. Feed-in operation begins.
✖ The green LED is flashing?
Possible cause of error: the DC input voltage is still too low or the inverter is monitoring the
utility grid.
• Once the DC input voltage is sufficiently high and the grid-connection conditions are met,
the inverter will start operation.
✖ The red LED is glowing?
• Rectify the error (see the service manual at www.SMA-Solar.com).
7 Commissioning
SMA Solar Technology AG
Operating ManualSTP15-25TL-30-BE-en-1334
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