Chapter 3: Installing The Power Optimizers; General Description - SolarEdge SE330K Installation Manual

23 Chapter 3: Installing the Power Optimizers

Chapter 3: Installing the Power Optimizers

General Description

The inverter is designed to directly connect to up to two PV arrays, via an external
combiner box.
NOTE
To enable the system operation in full capacity, connect at least 14 strings to
the inverter.
A combiner box is an electrical distribution box that may also host DC circuit breakers.
The main purpose of the box is to combine multiple parallel strings of PV modules in
the system into a single DC output. This DC output is then connected to a single DC
input in the inverter. The SE330K inverter has two DC inputs. therefore up to two
combiner boxes can be connected to each inverter.
The combiner box should be installed and connected before connecting to the inverter.
This simplifies the commissioning of the inverter by allowing testing and servicing the
inverter.
SolarEdge fixed input Voltage architecture enables parallel PV strings to be of different
lengths. Therefore, they do not need to have the same number of Power Optimizers, as
long as the difference between the shortest and longest string, connected to the same
inverter, is no more than five Power Optimizer.
NOTE
The DC Disconnect Switch of the inverter disconnects all ungrounded DC
conductors in compliance with the National Electric Code (NEC; Specifically,
NEC690.35, which addresses ungrounded PV arrays).
Figure 7 Shows a connection of PV arrays to the inverter via a combiner box.
Figure 7: Connection of PV arrays to the Inverter via a Combiner box
SE330K Inverter P/N: SE330K-xxxxxxxxx