48 Volt DC to 277 Volt AC Inverter

First I would ask how the 48vdc supply gets its power. (Hoping for an economical transformer rather than a large inverter in what may be an odd size.)

We have a 48vdc power plant. Wouldn't these be like a "ups system" but instead of batteries it wouldbe a power plant?

We use PhilTec also and have great results as long as your power plant and batteries are kept cool with plenty of a/c cooling.

I saved the link for my own self to reference too.

We have two 4 ton systems on our building sites but when the commercial goes it cuts back to no a/c but opens the fresh air so all the battery power is saved for the rectifers. You have about a 2 hour window to get to site and restore power by mobile generator if there is not one on site.

GA Have used 48VDC battery packs with inverters for up to 6KVA 277V UPS. The 48VDC input variation to the inverter from his power source is likely less than the battery as it approaches the specified time limit (usually about -20%), so the transformer can be a standard and more efficient.