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I am having an issue setting the “Battery Temperature Coefficient” on my XW+6848 Solar inverter.

Issue
Customer is commissioning a new XW+ system and is setting the Battery Temperature Coefficient based on the battery manufacturer’s suggestions

Product Line
Conext XW+
XW+6848
XW+5548
865-6848-01
865-5548-01

Environment
There is a “Battery Temperature Coefficient” value that is set to -84 and seems can’t be changed. My battery bank’s datasheet calls for -108 mV/C. When this value is changed, and saved, the message “The value could not be changed” is displayed.

Cause
Customer is using the wrong Battery Type on the XW+’s Charger Settings

Resolution
The Battery Bank Type should be set for custom (in the custom battery settings), then the Battery Temperature Coefficient will be adjustable. 
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