What wattage solar panel charger is best . If I have tints will it still work if connected to rear window ?  Present :2008 TDV8 HSE
Gone Audi A5 2.7TDI
Gone Discovery 3 HSE
Gone Mercedes CLK
Gone Range Rover 2.5 DSE

I use the 4.8w panel which fits between the sunroof and the sunroof blind, it fits perfectly and the cable is long enough to reach the rear compartment accessory socket.

Mike

Dont think they will work very well if at all with tints googs

Kudos on the new post service though  FFRR MY06 facelift With TDV8 Alloys Zeros/ATR's
Mantec Sump Guard, Rigid Load liner, MY10 BT upgrade.

Solar panels do work through tints but with a slightly reduced voltage relative to the light, with the sun shining i lost about 2 volts when behind the tint to not..........

I have the small maplins one on the rear window using the supplied suckers and wired through to my centre cubby box power outlet, you can hide the cable behind the seat and under the rear rubber mats.........the 2002-2005 RR appears to have all the outlets live even after sleep mode. I use the centre box as its convenient to pull the plug when i get in the car to drive, i just leave the cubby box lid up when connected to remind me when i get in.

My Bosch battery will only charge now to about 12.24 after a good run or using a battery charger so the solar panel is just to help keep it there when standing for a bit, the ideal should be 12.66 after a charge or run so mine is about 60% efficient against a new battery and may need changing come the winter.

Anything below 12.24 tends to set off the HDC inactive ping on start up............

Various states of charge of a battery, without a drain or load, after the surface charge has dissipated, are:

12.66 volts = 100% charged
12.54 volts = 90% charged
12.45 volts = 80% charged
12.39 volts = 75% charged
12.27 volts = 60 % charged
12.18 volts = 50 % charged
11.97 volts = 25 % charged
11.76 volts = completely discharged

Thanks for comprehensive answer. I have factory tints so might be a bit better than normal. Its only from reading this post that I now plug out my phone charger as I was constantly getting bong on start up "Special Programs off" and believed that to be a contributory factor.Also my Bosch is apparently only charging to 70 percent of capacity as noted at last service its 2 years old.  Present :2008 TDV8 HSE
Gone Audi A5 2.7TDI
Gone Discovery 3 HSE
Gone Mercedes CLK
Gone Range Rover 2.5 DSE