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How many of power supplies (ABL1) that we can possibly do the parallel or series connection

The outputs of Switching Power Supplies can NOT be connected in either series nor parallel unless they are specifically designed
 to allow for multi-unit synchronization. Very few SMPS devices are designed for this.

The reason is that each SMPS is switching 20,000 - 80,000+ times per second. If you connect their outputs together without them being
perfectly syncronized, they will not share the load properly and there can be very large voltage transients created which will destroy the
SMPS components and possibly even the load you have connected to them.

The ABL1 power supply has a feature to connect two power supplies in series or parallel. You cannot connect more than that in any case.
This information is also available in ABL1 power supplies specification sheet.
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