How to auto stop your petrol generator as soon as power returns :
Note that you can't auto start a petrol generator as it doesn't have a battery starter, which diesel generators have, but you can auto stop it which is a big gain.
Why auto stop? Otherwise if power fails at night you need to run the generator and sit tight until power returns for you to manually turn off the generator. That makes your family member's sleep more peaceful, but not yours. You are just as much miserable as when you didn't have a generator.
With auto stop, you pull the string to run it every time power fails and forget. It will stop automatically as soon power returns.
"OK, how to then?"
Open the on/off switch of your generator with a screwdriver. Will find a few wires connected to the switch. Figure out which wires short or which one disconnects when you turn it off or on using your multi meter.
Next disconnect all the wires from the switch and extend those out using extra wire. Buy a relay switch like the one shown in comment, which you can find in Nababpur or order online. Will cost around 100 taka, including the plastic base for wire connection. The plastic base is separate from the transparent relay shown in picture.
This relay is a on-off switch. You will need a 220V AC relay, which means it will turn on when you power it 220 AC, and turn off ass soon as you disconnect the power, which is exactly what we need.
But, which pins do you have to supply 220v for it to turn on? That you need to figure out yourself with trial and error. You will find two pins where supplying 220v turns it on.
Next you need to figure out which pins connect or disconnect when you apply the power. Use your multi-meter for that. You will find two pins from opposite sides of the relay that connect when you supply 220v to turn it on, and those disconnect when you turn it off.
You are now done. Connect the wires from the generator's switch to the relay so that the switch turns off when the relay is on. Next connect your relay directly with your mains supply which is outside your generator's coverage.
Now as soon as power returns, your generator will turn off automatically.
- Comments:
- 220v relay that I use.
