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SMA Solar Technology AG
6.5 Battery Connection (DC)
Connection Requirements
Battery capacity
The battery capacity depends on the connected PV power.
Observe the following table.
Nominal battery voltage
48 V
24 V
12 V
Excessively long battery cables reduce system efficiency
The cables leading from the battery to a DC distributor to which both the Sunny Island and
the charge controller are connected may not be longer than 5 m.
• Observe all standards and guidelines that apply at the installation location (e.g. DIN VDE 0510
"Rules for Accumulators and Battery Systems").
• Observe all specifications of the battery manufacturer.
Cable Requirements
NOTICE!
Irreparable damage of the cable leading from the charge controller to the
battery.
• Do not lay the battery cables under plaster or in armored plastic pipes.
Cable Protection
In addition to the thermal fuses in the charge controller, install a separate fuse as close to the battery
as possible. Install a suitable fuse according to the maximum specified DC currents. You can, for
example, install a 63 A miniature circuit breaker.
NOTICE!
Irreparable damage of the cable leading from the charge controller to the
battery.
• Lay the battery cables so that they are protected against ground faults and short
circuits if no line circuit breaker is present.
• Make sure that the cable cross-section is sufficient.
Installation Guide
Battery capacity per kWp PV
at least 120 Ah/kWp PV
at least 200 Ah/kWp PV
at least 400 Ah/kWp PV
Electrical Connection
SIC50-IA-en-11
23
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