Disclaimer: I'm not after repair information or modifying any appliances myself. I'm after a reason why this is happening.
I have noticed that during peak times (6pm - 10pm) that power to mains appliances "slows down". By that I mean the exhaust fans (bathroom, kitchen, etc.) run slower, and the ignition for my gas stove discharges at a slower rate than in the morning.
I find this very strange, because the appliances in question don't use much power, and the RCD/Circuitbreakers never trip.
Some additional info:
- Two 2kW HVAC's running currently without a problem
- 230VAC, Single Phase
- This isn't a one off event, I have noticed it for about a month.
- This is in a country with fairly stable electricity grid.