cheap 12v solar panel for trickle charge.....

I've got one of those, and yes it truly is a trickle charger. It puts out enough umph (50mA or so in the noon summer sunshine) to compensate for the battery drain from the permanent connection to my ex-car stereo.
 
Just got a 40 watt panel from sunrise energy from ebay here. £105 inc P&P and 5 metres of cable, bypass diode and connectors. Claimed output 2.35 Amps but I had 2.7 out of it so very pleased. They do 10 to 200 watt panels...
 
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