I recently installed a new Varios 8 DC return pump in one of my tanks. As it was replacing a Varios 6 running at 100%, I set it at a constant (except for maintenance) 80% output under Apex control. By all other parameters, it seems to be running perfectly. However, I've noticed this pattern where the amperage of the pump drops slightly at night, every night. Wattage draw remains stable.
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Others pumps I've had and currently have don't show this; amperage draw stays very steady.
I was thinking about what could be going on here. One thing I've noted before is that our line voltage here does increase significantly at night. Superimposing the two plots as below, it seems that they correlate. Is this it? The pump just requires less amps because the line voltage increases? If so, is this 'fine', or any cause for concern?
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