Add to Cart SMA SMA MCB-12U 3-Phase Multicluster Box for up to 12 Inverters $21,999.00 SMA MCB-12U Three Phase Multicluster Box for up to 12 Sunny Island Inverters The Multicluster Box for the Sunny Island 4548-US and 6048-US is the ideal solution for the easy installation of off-grid systems up to 100 kW. Two to four three-phase... Compare Add to Cart Add to Wishlist