Use one that has the "240VDC (China only)" rating, and feed them proper DC. Or get the modern western ~300V DC input ones, there's no good (technical) reason t

Use one that has the "240VDC (China only)" rating, and feed them proper DC. Or get the modern western ~300V DC input ones, there's no good (technical) reason to feed AC from a non-grid-tie inverter to a SMPS-only circuit. The DC can be quite passive, just switched in via a relay and anti-reverse-current-diode together with bridge-rectified mains, she otherwise just bare battery bank voltage There's a reason modern data centers use that style of setup (except with a central power factor correcting rectifier, not a plain bridge rectifier, and often hanging the batteries on it directly using controlled rectifier output voltage to control battery charging).