SMA HM-20 User Manual

6 System Structure
SMA Solar Technology AG
Operating manual 21HM-20-BE-en-19
6 System Structure
6.1 System Requirements
Router
The router connects the SunnyHomeManager via the Internet to SunnyPortal.
SMA recommends a permanent Internet connection (flat rate) and the use of a router that supports the dynamic
assignment of IP addresses (DHCP ‒ Dynamic Host Configuration Protocol), e.g. a Fritz!Box.
All network components used must support the IGMP protocol, minimum version3 (IGMPv3). If Ethernet network
switches are used in the system, make sure that they do not perform "IGMP snooping". This is the case with most simple
switches; this function must be turned off for higher-quality "managed" network switches. Using media couplers such as
powerline adaptors can cause transmission problems. Usually, a firmware update of the manufacturer makes these
devices compatible with multicast operation.
6.2 System Topology
The SunnyHomeManager must be installed behind the meter and the input fuse of the grid operator and in front of
the first distributor in the house. SMA recommends using the SunnyHomeManager for measuring at the point of
interconnection. As a bidirectional device, the SunnyHomeManager measures both the grid-supplied power and the
grid feed-in at the point of interconnection. For the function Limiting of the active power feed-in, at least 1
measurement at the point of interconnection is required.
The SunnyHomeManager receives the measured data for PV generation, grid feed-in, and grid-supplied power via
the integrated measuring device directly from the connected SMA inverters or a separate, optionally connected
SMAEnergyMeter.
If third-party inverters are installed in the system (see Section5.3.3, page19), an energy meter must measure the PV
generation of all inverters. The Sunny Home Manager adopts the data and processes it.
Operation of the PV system with SMA inverters or with optional third-party inverters by using an
SMAEnergyMeter
SUNNY PORTAL
SMA
EV CHARGER
SUNNY HOME
MANAGER 2.0
SMA
ENERGY METER
UTILITY GRID
PV MODULES
APPLIANCE
AC
DC
Radio
INTERNET
SMA
INVERTER
ROUTER
(incl. SWITCH)
UTILITY METER
FOR BILLING
PURPOSES
WEATHER DATA
Ethernet
SMA
BATTERY INVERTER
optional
3rd PARTY &
SMA INVERTER
SMART HOME
CONTROL
EQUIPMENT
INTELLIGENT
LOADS
Figure 4: Topology showing SMA storage solutions and various controlled loads (general example)

SMA HM-20 Specifications

General

Brand	SMA
Model	HM-20
Category	Measuring Instruments
Language	English