For String Inverter
PVPB SI 10-1 SL
PVPB SI 20-1 SL
PVPB SI 30-3
One PV Power Booster fits for one String inverter.
In case of several string inverters positioned in one place, up to 4 string inverters can be connected to the DC output of the PV Power Booster with the PVPB-Extender.