That's what I am thinking too if you can ditch that transformer and just feed straight DC to these boards.
have done such things as this with my music equipment .had supplies built and added relays for auto switching ac dc power . funny at festivals when some idiot security switches off the generator .
It would be nice to know exactly what the 48VAC is being fed to, basically if it requires sinusoidal AC then it's harder to deal with. There are some circuits that need 48VAC but it's okay with 48VDC, and some devices would take a square wave if it can't take straight DC. Knowing which of the three cases would make it easier to find a solution.
If it turns out to be the generic case, requiring sinusoidal AC, the easiest solution is the DC-AC and then transform it down, but then you also need a sinusoidal inverter.
It could also be the case you can rip off the input conditioners and feed the device straight DC too... that would make it easier and more efficient, no extra conversions needed.
have done such things as this with my music equipment .had supplies built and added relays for auto switching ac dc power . funny at festivals when some idiot security switches off the generator .
Sweet! I've done this to older equipment many times. Even converted European stuff to North America power mains voltage. Also fed straight DC plus buck converters to maximize efficiency while on battery.
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