Hello-
I have a recent solar panel installation at my home in Rio de Janeiro Brazil. Specs: 9.6kWp, 24x 400W panels (Canadian Solar), 8.2kW inverter (Fronius 8.2-1). I have installed a Schneider Electric IEM3255 smart meter which measures power in/out of my house along with the built-in monitoring from the inverter.
I have noticed that there is a consistent increase (to a max of 1kW extra) in my household power consumption matching when there is solar power generation. On a sun-less day we do not see this increase, and on intermittent cloudy days this increase comes and goes with the sun.
In the attached images, green is PV gereration, yellow is overall household energy consumption as measured by the Schneider Electric IEM3255 independent of the rest of the system.
The first attached image (28052019) shows a typical sunny day while we are away at work, no one at home during the day. Our background electrical usage is around 1kW, which rises to about 2kW during the sunnies part of the day, then drops back down to 1kW when the sun goes away.
The second attached image (10062019) shows a cloudy morning, sunny afternoon.
The third attached image (04062019) shows a cloudy day with short bursts of sun. See how the consumption peaks match with when the PV gererates power.
Any idea on where this "extra" 1kW of power consumption comes from? Does the inverter use power when it is working?
Thanks for any help!
-Jon
I have a recent solar panel installation at my home in Rio de Janeiro Brazil. Specs: 9.6kWp, 24x 400W panels (Canadian Solar), 8.2kW inverter (Fronius 8.2-1). I have installed a Schneider Electric IEM3255 smart meter which measures power in/out of my house along with the built-in monitoring from the inverter.
I have noticed that there is a consistent increase (to a max of 1kW extra) in my household power consumption matching when there is solar power generation. On a sun-less day we do not see this increase, and on intermittent cloudy days this increase comes and goes with the sun.
In the attached images, green is PV gereration, yellow is overall household energy consumption as measured by the Schneider Electric IEM3255 independent of the rest of the system.
The first attached image (28052019) shows a typical sunny day while we are away at work, no one at home during the day. Our background electrical usage is around 1kW, which rises to about 2kW during the sunnies part of the day, then drops back down to 1kW when the sun goes away.
The second attached image (10062019) shows a cloudy morning, sunny afternoon.
The third attached image (04062019) shows a cloudy day with short bursts of sun. See how the consumption peaks match with when the PV gererates power.
Any idea on where this "extra" 1kW of power consumption comes from? Does the inverter use power when it is working?
Thanks for any help!
-Jon
The AC has been turned off.
