SMA STP 12000TL-US - Manual (Page 42)

5. Loosen the screws of the DC protective cover
using an Allen key (AF 3) and remove the DC
protective cover.
6. Use a suitable measuring device to ensure that no voltage is present at the DC terminals.
7. Use a suitable measuring device to ensure that no voltage is present at the AC terminals.
9 Disconnecting the Inverter from Voltage Sources SMA Solar Technology AG
Installation Manual STP12-24TL-US-IA-en-16 42