SMA HM-20 User Manual

8 Connection
SMA Solar Technology AG
Operating manual 25HM-20-BE-en-19
• When only using it to measure the PV generation power:
Connect the SunnyHomeManagerto the common connection point of all PV inverters in the household grid.
Information: To measure the grid exchange capacity, an SMAEnergyMeter must be installed at the point of
interconnection.
• When only using it to measure the grid exchange capacity:
connect the line conductor L1 and the neutral conductor to the screw terminals at the input of the
SunnyHomeManager. Open each screw terminal using a cross-head screwdriver, insert the conductor into the
contact terminal and tighten the screw (torque: 2.0Nm).
8.2.3 Connecting the Voltage Supply greater than 63A
Current transformers must be installed for a voltage supply >63A.
L1
L2
L3
N
L1
L2
L3
N
k/S1
l/S2
N
L1
L2
L3
k/S1
l/S2
k/S1
l/S2
L1
L2
L3
L1
L2
L3
N
OUT
IN
Current
transformer 2
Current
transformer 1
Loads
Disconnect switch
Energy meter
of the
electric utility company
Main breaker
(three-phase)
Utility grid
Current
transformer 3
Line conductor
Neutral conductor
Meter output, load side
Meter input, grid side
L1/L2/L3
N
OUT
IN
Connection cable for voltage measurement
Connection cable for current measurement
Figure 6: The following figure shows a connection example in TN and TT utility grids in the case of installation at the grid-connection point.
Additionally required material (not included in the scope of delivery):
☐ 3 x current transformer (recommendation: 5A secondary current, accuracy class at least 1)
☐ Connection cables for current transformers
Procedure:
1. Disconnect the connection point from voltage sources and make sure it cannot be reconnected.

SMA HM-20 Specifications

General

Brand	SMA
Model	HM-20
Category	Measuring Instruments
Language	English