If all else fails you may need a new garage door opener.
Garage door opener plug power.
3 transformer has 120 volts in and low ac out.
When the power goes out genie battery power kicks into gear automatically.
Your opener may be old and parts are hard to find.
Power to garage door opener.
The advantages of a dc motor include smaller size quieter operation and softer starts and stops.
4 4 rectifiers.
When several different models were tested the annual energy use varied anywhere from 15 8 kwh to 127 0 kwh or 2 to 16 per year.
This works with belt chain and screw drive garage door openers.
This unit is designed as a replacement battery backup unit or an upgrade for all genie 140 volt garage door openers.
Both plug into a standard home power outlet but dc powered openers convert ac to dc power.
2 power runs through fuse wires and on the circuit board.
Plug the garage door opener into the outlet and test it.
So how much energy does my garage door opener burn when on standby.
Garage door openers have motors that run on either alternating current ac or direct current dc.
See the images for a compatibility guide.
Like everything else this answer is heavily dependent on the make and model.