48V DC kit?
"[...]run an inverter off the stabilised DC [...]"
Who needs an inverter anyway?
Once upon a time, when telco gear in phone exchanges (?) ran off rather large 48V DC batteries and sometimes a generator backing them up, some of the equipment manufacturers had 48VDC (rather than mains) powered variants of some of their computery kit, with the only difference being the input power conversion (what's in a switched mode power supply anyway?).
Does that kind of thing still exist?