I dunno if it is of value to you or not, but I am almost done with a new
DC UPS design. HW is done, SW is nearly done, working on some time
totalizers in it.

It has

85-265VAC input
24VDC @ 800mA output
one 12V gel cell or lead acid battery you attach
Adjustment to match AH
Full charge cycle control in software
Modbus serial port allows access to all control parameters

I designed it for the remote telemetry location application where they
do not want to put an office rated UPS in the box. This one is a rail
mounted device.

I plan a 100W version, but that takes custom magnetics, so I gotta
finish the 800mA version first.

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