Standard practice is to site the inverter in the attic as near to the panels as possible.

There are two reasons for this:

1. To keep the DC cable run as short as possible. (it’s high voltage and small amounts of power can be lost in the run to the inverter)
2. Space. Due to the size of the inverter the attic is best placed rather than within the house.

Attics get very hot in the summer so your inverter may have a fan which kicks in to stop overheating. As your roof faces South West it will get the sun late in the evening so the noise may affect your child. Maybe check this with your installer.

If you have an internal garage this could be suitable. The inverter could be wall mounted onto a fire proof MDF board.