What size diode do I need for a battery back up circuit?


have flood alarm uses 240v ac power source transformed 12v dc @ 5a. protect against power cut want wire in 9v battery (like in smoke alarm) know need diode prevent battery being charged transformer. reckon can plumb in, bewildered various ratings , terms applied diodes. have reached limit of electronics knowledge in writing question please go easy me on replies! ratings need out ensure diode through job, please?

i have flood alarm uses 240v ac power source transformed 12v dc @ 5a. protect against power cut want wire in 9v battery (like in smoke alarm) know need diode prevent battery being charged transformer. reckon can plumb in, bewildered various ...


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