120v Feedback from Appliance to Inverter?
Wondering if the PSW inverter can "see" what is plugged into it. Never mind between inductive and resistive--I mean between different resistive appliances. Does each appliance have its own feedb...
Forum Discussion
Purely resistive loads will introduce no noise in the AC supply, by definition.
Most other appliances introduce not much noise. GordonThree's observations about the fans and TV may be due to power line noise from the TV, but it may just as well be the output noise from the inverter changing as its load changes and hence the duty cycle of the output stage is changing somewhat. I have a hard time envisioning any realistic scenario where power line noise from connected devices would cause trouble for an inverter unless it was very, very bad, and there would be other observable effects from it in that case, too.
The microwave clock there is somewhat of a red herring in terms of sine wave purity--it's most likely just getting its time base from the 60 Hz AC line, and the inverter is actually putting out something closer to 59.95 Hz rather than precisely 60 Hz. It's a frequency offset, not line noise as such. The AC grid has very very good long-term frequency stability, partly because electric clocks have long used it for their timebase and nobody likes clocks that gain or lose time. (In relatively recent times, starting around the 1970s, quartz crystal oscillators have replaced the power line as the frequency reference for many household clocks and timers.)
There is absolutely nothing in an AC distribution panel that would have any impact on power line noise propagation. Some AFCIs, which might be more commonly seen in newer panels, are more or less sensitive to various forms of line noise. The general design of the panels themselves are basically unchanged for many decades; they're not much more than bus bars and clip fasteners and miscellaneous hardware.
Most other appliances introduce not much noise. GordonThree's observations about the fans and TV may be due to power line noise from the TV, but it may just as well be the output noise from the inverter changing as its load changes and hence the duty cycle of the output stage is changing somewhat. I have a hard time envisioning any realistic scenario where power line noise from connected devices would cause trouble for an inverter unless it was very, very bad, and there would be other observable effects from it in that case, too.
The microwave clock there is somewhat of a red herring in terms of sine wave purity--it's most likely just getting its time base from the 60 Hz AC line, and the inverter is actually putting out something closer to 59.95 Hz rather than precisely 60 Hz. It's a frequency offset, not line noise as such. The AC grid has very very good long-term frequency stability, partly because electric clocks have long used it for their timebase and nobody likes clocks that gain or lose time. (In relatively recent times, starting around the 1970s, quartz crystal oscillators have replaced the power line as the frequency reference for many household clocks and timers.)
There is absolutely nothing in an AC distribution panel that would have any impact on power line noise propagation. Some AFCIs, which might be more commonly seen in newer panels, are more or less sensitive to various forms of line noise. The general design of the panels themselves are basically unchanged for many decades; they're not much more than bus bars and clip fasteners and miscellaneous hardware.
