Barbara - I'm not on the boat at the moment and don't recall
the exact details, but the trick is to go into the installer mode (see the manual for the incantation). This lets you have much more detailed control over the various parameters... including maximum charge rate. In mine, the only way it could charge at the full rate corresponding to the bank size was for me to open the DC panel (behind which it is mounted) and aim a box window fan in its general direction. Otherwise it works for a while and then shuts down with an overtemp error.
I should note that while I do not like the unit for other reasons, this particular problem is not its fault... the installation
did not provide for adequate airflow.
David - good solution with the variable speed fan! For the new Outback installation
, I bought a wood grille and a small louvered vent; the combo will provide a convective loop through the enclosure. The FX2012 has an AUX output that can be configured to turn on a fan when it's getting warm; I like the idea of it being a smart fan to keep noise
to a minimum.