In considering a DIY UPS-ish system (small bank of AGM batteries and an inverter), I knew I wanted/needed a charge controller, but most I found were just intended for keeping e.g. car batteries topped off.
It has since occurred to me that "solar" charge controllers, of which small 10-30 amp versions are in abundance, run off DC input anyway.
Is there anything wrong with feeding any typical charge controller intended for solar panel input with mains power via an ordinary DC power supply like you'd find on, say, any amateur radio operator's desk? Any special considerations beyond making sure I don't feed the controller more voltage than it can handle?