SMA STP 15000TL - Manual (Page 16)

Electronic string fuse
The electronic string fuse protects the PV array against potential reverse currents. The electronic
string fuse recognizes DC cables that were connected with reverse polarity or defective PV modules
and short-circuits the PV array. In order for the electronic string fuse function to be reliable, the
connection of the PV array must be made when there is sufficient irradiation. If the input voltage is
less than 188 V, the protective function of the electronic string fuse is not active when the
connection is made.
Q on Demand 24/7
The inverter can supply reactive power by means of Q on Demand 24/7 covering the entire unit
circle around the clock.
Integrated Plant Control
The inverter can display the Q(V) characteristic curve specified by the grid operator by means of
Integrated Plant Control without measuring on the grid-connection point. The inverter can
automatically compensate equipment installed between the inverter and the grid-connection point.
4 Product Description SMA Solar Technology AG
Operating Manual STP15-17TL-10-BE-en-10 16