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Electrical Connection
6.7.2 Battery Temperature Sensor
To allow a temperature-independent charge control during stand-alone operation or during operation
with a Sunny Island 3324/4248, you can connect an external battery temperature sensor (BAT-
TEMP-SENSOR: replacement battery temperature sensor, KTY type with 10 m connection cable for
Sunny Island, Sunny Backup or Sunny Island Charger) to the charge controller.
SMA Operation
No external battery temperature sensor is required when operating in "SMA operation"
mode.
NOTICE!
Damage to battery due to excessive or insufficient charging.
In "Stand-alone operation" mode, a battery temperature sensor must be connected.
Otherwise, the battery may be excessively or insufficiently charged if temperatures outside
of the temperature range +15 °C to 25 °C occur frequently.
• Connect an external battery temperature sensor if the charge controller is operated
in stand-alone mode or together with a Sunny Island 3324/4248.
2 kΩ resistor
A 2 kΩ resistor is connected by default to the connection terminal for the battery
temperature sensor.
If neither the resistor nor a battery temperature sensor are connected during stand-alone
operation or during operation with a Sunny Island 3324/4248, the charge controller
cannot be commissioned.
32
SIC50-IA-en-11
SMA Solar Technology AG
Installation Guide
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