The Owl + USB will not provide the correct electricity consumption figures for your household and is therefore not compatible. PV Photovoltaic systems will at times export energy to the grid and at other times will import to the household during high consumption or at times of little or no solar generation.
The Owl + USB cannot monitor both consumption and export on the same cable.
If you are a customer who already owns one of these devices, you can re-utilise the product by moving the cable clamp to the positive output of your inverter though please note this will only show Solar PV generation.
If you do need to monitor a PV system you may wish to look further at the following product Solar PV Monitor