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Power Supplies
If the mount does require more than 12V to operate effectively that may well be the problem. Laptop chargers are usually 19V, so the combined laptop plus mount etc. load may well be dragging the available voltage down to 12V or less.
The usual Powertech charger is 15V 2A, so it may be worth using that instead of the 12V 5A power supply you are using just to see if this varies the time elapsed before drop off occurs. This would then be a clue that under voltage is the problem.
Are all of the loads hanging off the Powertech with the 12V 5A supply then charging the Powertech?
If under voltage is the problem I would look for a straight 15V 5A power supply rather than the multi voltage one you suggest to avoid the risk of frying the mount and / or having too large a voltage difference between the charge voltage and Powertech output voltage. Laptop on board voltage controllers normally limit the voltage output from such power supplies to suit and in this case you may finish up with the highest voltage being supplied. Make sure that the dc plug diameter is correct on what you buy and that the connection is “centre pin positive!”.
You know you will be ok with a 15V charger for the Powetech as that is what the Powertech normally uses.
The NEQ6 will also be fine at 15V max but I wouldn’t go above that.
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