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Your Imac most likely uses a standard DC-DC converter since it allows an input of 100-240VAC. Typically these converters will take any DC or AC input in the range stated on the back panel. Since they rectify the AC to DC, then convert it down to 12 and 5 volts DC. Thus you would need to use 100 VDC to 240 VDC by running your panels in series then modifying the plug to hook up to the DC power. 24VDC from the panel would NOT work in this case.

Of course there is a chance you could turn the Imac into a puff of smoke doing this as well, but it’s unlikely based on how these DC-DC converters work.