In the autumn of 1942 the Alkett company started the development of a new SPG with a 150-mm gun. To boost new vehicle production, it was planned to use the readily available components of Pz. III and Pz. IV vehicles. The SPG was made on the same chassis as the Nashorn heavy tank destroyer. A total of 714 vehicles and 150 ammunition carriers that used the same chassis were built.
Hummel
Maybach HL 108 TR R
FuG 5
15 cm s.F.H. 13 L/17
Hummel verstärkteketten
Maybach HL 120 TRM 112 R
FuG 7
15 cm s.F.H. 18 L/29.5
Maybach HL 120 TRM R
FuG 12
Characteristics are specified for vehicles with crews trained to 100%.