I've got a Nosram 10A power supply and it fails to run 2 chargers - even if the charge rate is set to be a total less than 10A.
It seems that the start up (In-rush) current when you a switch the 2nd charger on causes the PSU to dip and the first charger (an LRP Pulsar 2 Comp) trips out at that point sensing an input failure.
Didn't bother after than - I now run one from the PSU and one currently from a 12v until I can afford a new 14A or 24A PSU.
Hope this helps
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