The isolation diode removes the possibility of the power supply sensing the delivered voltage, and throws away power – 0.7 V x your current drain.

I recommend using a relay whose coil is energised when the power supply is turned on. Energise the coil from the supply’s mains switch, not the 24 V output. Gets around the problem when the mains fails, too.

73 de Brian, VK2GCE

From: [email protected] [mailto:[email protected]] On Behalf Of Glenn Little WB4UIV
Sent: Tuesday, 6 September 2022 7:09 AM
To: [email protected]
Subject: Re: [ARC5] 24vdc power

It is so simple, just a transformer, rectifier and filter.
Add an isolation diode between supply and battery.

73
Glenn
WB4UIV