Would like to share above idea... Very simple project and ease your mind when you out from home for 1 or 2 days away from yr tank. Air aeration during a black out or power outage only and Charging when power on.
Being trying on DC battery operate air pump and DC Pump.
Below r the piece parts used.
1. DC battery operate air pump
2. 1x variable resistor (4.7k ohm)
3. Automatic Emergency Light (need to dis-solder one point for Air pump/DC pump)
DC operate Air pump (modify to external power)
Automatic Emergency Light system (modify to one output for other usage)