My EW4009 Solar Monitor Is Reading Some Wattage Over Night. Why?
Modified on: Mon, 1 Aug, 2016 at 3:58 PM
Your solar inverter will draw a small amount of power over night in standby mode. What happens with the monitor is they pick up this current as production ( because they can't sense direction) and report the wattage too high. They measure VA's but report watts.
This is the nature of CT current sensor clamps and how they work and you would have a similar problem with any wireless energy monitor of this sort of problem.