Extemely simple automatic emergency light. Answered
I'd like some help to settle an argument regarding my extemely simple automatic emergency light.
According to my friend, who installs emergency lighting, this circuit is too simple and has too many components missing but I say he's wrong, if one part fails it can easily be replaced. I'm not and electronics expert either.
I'll explain the circuit...
5v comes from a 5v 2A phone charger.
Battery is a 32Ah 12v SLA. 12v charger is a smart charger with built-in status monitor.
SPDT 5v relay rated to switch 12v @ 17amp max
The light is a 12v 5 metre LED Strip with built in current-limiters and draws arount 2A.
Basically, 5v powers the relay which means the battery is connected to the smart charger that keeps it topped up while there is mains power (240v here in UK). If there is a power cut the relay turns off and battery is switches over to the LED light Strip. Its that simple.
It works as designed, no parts have failed and I haven't found any signs of over-heating. My friend believes it should all be one circuit and not seperate parts and is a fire risk as it is.He just won't let it go, so does he have a point or is he just being a/an _________ (fill in the blank, lol)? I've included a schematic of the circuit. Not sure if I've drawn the relay properly though.