Cinema HD Display: specs for DC power supply

I recently bought the 23-inch Apple Cinema HD Display for the navigation station on our yacht ADAGIO. This lovely display replaced our previous 22" Cinema Display --> the purpose being to reduce the odds of a failure during our next Pacific Ocean crossing.
My unusual question: *what are the voltages supplied to the HD Display by the white power brick*?
I need to replace the brick with 24VDC DC-DC converter, because the new HD Display power brick doesn't like being supplied with 240VAC/50Hz from our modified sine wave inverter. When inverter powered, the display randomly reboots itself --> so you see a black screen, loss of USB to keyboard/mouse for about 3 seconds. I have proven that this fault is completely eliminated by powering the brick via either shore power or our 10kW generator (both are sine wave of course).
The inverter power is the only practical option when we are at sea - we only run the generator for 1 to 2 hours out of 24.
Any ideas how we can find out what the brick supplies? The info is definitely not in the tech specs nor user manual.

Aha - remoting sensing - thanks for that enlightenment.
First, to your point about supplying the brick by a UPS or line conditioner. Yes that is an option. The issues with shaping the power into the brick are:
1. Leaves ACD operation dependent upon 240VAC from some source. So if the inverter goes down, we either run genset or switch to MacBook Pro.
2. Ship's power is already 24VDC, which unregulated varies 26.5 to 28.8. Will that work with adding regulation? The spec on our older Cinema Display was 24.5 to 28 VDC -- I installed a 24V DC-DC converter just to ensure regulation to less than 28V.
3. Not relevant, but it is irritating to buy/install a UPS when we already have a super UPS supplying the ACD I.e., 540 amp-hour gel battery bank -> 3500 W inverter -> ACD.
Have you any recommendations on a 240V conditioner or UPS?

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