Replace MultiPlus-II 48/5000 with Multi RS Solar 48/6000?

DIY
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The 450/100 has better specs as far as current and power. I don’t know what the voltage of your string will be but if you could put 15 amps at 360V MPP would be over 5000W per string. I have an east and west array on one of these and get 100A of charging most of the day. In the morning the east is doing 11A and the west is only doing 1A. In the middle of the day they sit around 7A and the west takes over in the afternoon.