Parallel kit for 3 units （3 units are master）
Parallel kit for 4 units（1 unit is master, 3 units are slave）
Parallel kit for 4 units（4 units are master）
Parallel kit for 5 units（1 unit is master, 4 units are slave）
Parallel kit for 5 units（5 units are master）
Parallel kit for 6 units（1 unit is master,5 units are slave）
Parallel kit for 6 units（6 units are master）
Parallel kit for 7 units（1 unit is master, 6 units are slave）
Parallel kit for 7 units（7 units are master）
Parallel kit for 8 units（1 unit is master, 7 units are slave）
Parallel kit for 8 units（8 units are master）
