Hi,
well I can quite see Georgiaboy's point, in general terms
I did once bring more money into Ghana than I needed, so I tried to send some back (my account was with CAL Bank).
For one thing sending money out was limited to USD 10,000 (as I recall) per annum at the time - this was probably 2013 or 2014. Well, the CAL Bank sat on the transfer request for a long time but nothing ever happened, so in the end I withdrew the cedis and exchanged the cash for euros with a reliable - but unofficial - money dealer at Market Circle, Takoradi, and took the euros with me to Europe.
In my days at Barclays Bank in Accra (1967 - 1970) we had what was called a PRQ, Personal Remittance Quota, which allowed us to send surplus earnings home - to the UK in my case. That system has doubtless disappeared since the cedi became (officially) convertible. I would check with Barclays or one of the other international banks such as Standard and Chartered.
HTH
Rod