[Pav]

What's the nominal voltage of the modules?

 

[boekel]

What's the nominal voltage of the modules?

it's built up from 6s and 12s modules, so roughly 24 volt and 48 volt

 

[brian_]

What's the nominal voltage of the modules?

The nominal cell voltage is 3.75 (not 4.0), so they are 22.5 V and 45 V.

The Opel Ampera is called the Chevrolet Volt in North America, and this document from GM covers both generations of the battery:
2016 Chevrolet Volt Battery System
The 2015 Ampera battery is the Gen 1 design.

 

[boekel]

Sold! thank you.