Are there any devices I can't charge using the LightSaver Max?
Anything with either an instantaneous or continuous draw of over 60 watts. Certain power adapters have extremely noisy draws (electrical noise) that can produce brief draws over 60 watts even if they are rated under 60 watts. Devices like these can still charge, but they will cycle on and off intermittently due to current spikes.
Outputs will stay enabled until the system is shut off with the button or 90 minutes have passed with no load on the outputs (this is to allow the Max to remain on for long periods of time while charging lower draw electronics completely).