M.Joshi wrote:
Hello all,

I'm thinking of connecting a 12V 10W solar panel permanently to my
vehicle battery as I am not using it very often.

The battery keeps going flat in the cold weather.

You will have noticed that weather is cold because , by and large the
sun doesn't come out much, or for long, and its a bit weak when it
does, so exactly what do you hope to achieve by this ridiculous exercise
in naïveté?




What I wanted to know is if others have done this and whether there is a
danger of damage leaving the panel connected when starting the car?


Why not connect it to a micro-ammeter. At least you will be able to see
something happening.

The panel I am thinking of purchasing off eBay has a protection diode
built-in.

Which clearly shows thinking is something best left to people who know
how to do it.