Battery PV battery charging?

[Robotstar5]

Never had anything to do with PV so here goes...
Got an electric fence at the stables powered by a 12V leisure battery, have to re-charge about every 12 weeks. Had a look at fitting a PV to charge it and there seems to be a couple of types, one connects straight to battery with a blocking diode, the other type uses a PWM charge controller. The fence draws about 50mA.
Any advice on which type to use, what to look for etc.?
Thanks.

 

[Worcester]

The problem is winter not summer and you are not drawing a lot of current, so something as simple as this may do: 10W Solar Panel Kit : Crystalline Solar Panel Kits : Maplin Electronics

 

[Robotstar5]

Thanks for reply and link, I know which type to get now. Not bothered about charging the battery occaisionally during the winter.