It's 41, 20A and a mini-fuse, but please remember that the fuse also powers the OBDII port. So if it does blow, you won't be able to flash the PCM.

Personally for 15A (180 watts), I'd either run a separately fused line directly from the battery to a separate power point, or I'd just hook it up to the battery (again with an inline fuse) when I needed it.

It also looks like position 104 is not used. Maybe you could see if there's power available there?