I've checked it a while back, Nothing out of the ordinary, about 80mA.Does sound like it would pay to check the quiescent drain, see what load is constant.
Solar can be rubbish if cloudy, wrong orientation, or shaded, so it is good to know what sort of wattage is required to stay charged, and then get a panel that is rated five times(+) that.
This one I think is small, rated at about 6W, has nothing connected to the battery and is south facing.
Which for the alarm, clock etc sounds about right.
This is on my old car btw, not the one that's eating the batteries.
That one gets used daily.
The problem with mine is it sits all week doing bugger all then at weekends does about 15 or 20 miles on average mostly on short runs.
It's just not getting the charge time it needs, don't think it's a drain fault.