SagieN

That defeats the purpose as the inverter will be on at times the sun really doesn't shine... I'm assuming you're charging via panels primarily. 
Best option is to keep it in a garage and out of hearing. The 5KVa is loud and annoying.  You can't really dismiss it as background noise as the pitch of the fans changes constantly and makes you always aware of it. When under heavy load they are very loud. 
Also remember that the fans are used to displace heat,  so in a small space this could be a problem. 
I currently have this in my basement and am running over 20 metres of cable to my DB.  Losses are negligible and it works just fine. 
If you have a shaded wall outside you could get a largish plastic container from Westpack and mount it outside and drill holes for the cables to the DB and batteries.