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Can anything be done about AC load "ripple"?
paulca:
My off grid inverter powers my office. It's usually between 200W and 450W. The issue is, it's noisy as hell. The load graph looks like a random sawtooth like pattern. Lots of noise, 5-10W of it.
It's on the ACOut and makes it through to the DC side and is seen on the battery current and voltages too. So it's real.
My understanding is there is very little that can be done about it. You can't just store AC power in a capacitor to smooth it.
An example this morning. Its just "load noise", the power factor isnt that bad either, given it's 90% SMPSUs.
m k:
What is X-scale, minutes?
Low pass, 10th order Butterworth, passband 75Hz, stopband 119Hz.
https://tools.analog.com/en/filterwizard/
paulca:
The X axis is "clock time".
Y axis is Watts and VA
paulca:
Interestingly, if I look at the voltage chart, it does not have that noise. it's 230V, 50Hz stable. it droops and spikes with high load changes, but it doesn't have the noise.
This makes sense as it's load driven noise, the power requirements are altering, probably constantly, the graph resolution is only 0.2Hz tops.
So if voltage is stable and the VA is bouncing it means the current is bouncing.
I need an AC capacitor and I know they don't exist. How do you store alternating current? With an alternator, aka a flywheel. I don't think a ton block axle and some AC induction motors/generators is worth it though LOL
m k:
Battery is a flywheel, so is grid.
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