In an earlier contribution to this discussion,
Aidan wrote:

It's a BMS outstation, a computer type device intended to monitor &
controls heating & stuff.

On the pcb, it has an encapsulated transformer 0-24V pri/0-18V sec,
adjacent to the power input. The power is from a 24V ac mains
transformer.

In that case, use the *same* mains transformer running from an inverter -
like I suggested earlier.
--
Cheers,
Set Square
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