1. Install up to 12 x batteries instead of 8 x batteries per cabinet 2. Install either 3 x 5kVA, 3 x 8kVA, 3 x 10kVA, 3 x 15kVA inverters instead of 2 x 5kVA, 1 x 8kVA, 1 x 10kVA inverter or 15kVA inverter 3. Power Hub Commercial is airconditioned, XL is cooled by fans