The unit you have linked looks to be only a voltage regulator. It can only limit your AC output to a specific voltage level. It will not create DC voltage.
If both systems need to be ground you should have a half wave rectifier. The simplest way to get DC is to use an ordinary full wave rectifier and ISOLATE your DC output.
Thus the DC is wired directly to your devices WITHOUT the minus connected to ground.
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2011 EC250E
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