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#1
10th March 2015, 08:17 PM
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Sorry Guy, The only references to this that I can find are just questions like yours.
There are remarks about a VW solar panel that new cars are shipped with to the States. These sit on the roof via four suction pads and plug into the cig lighter socket. Keeps the battery charged during transit/storage. But that, I know, is not what you really want.
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Ray at Wigan Pier 2014 A8L D4 4.0TFSI Gold (Sticker says "Beige") Can't leave you in a black smoke cloud anymore.. In progress, Nothing left to do.  Gone 2004 A8 D3 3.0 TDI. Ebony Pearl Black (with little bits of other colours and glitter) 
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#2
10th March 2015, 09:48 PM
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I recall reading the earlier stuff with vague interest and deciding not to bother.
BUT it was for the D2 which has fairly simple battery circuitry, whereas the D3 is much more complex. 
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant. 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one!  Finally: gone, but not forgotten..... 1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850! 
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#3
11th March 2015, 05:40 AM
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Not sure what voltage solar sunroof panel outputs but you will need some kind of DC-DC charger that can take variable voltage from the solar panel and supply constant voltage to the battery. Example here http://www.powerstream.com/pv-control.htm
Having a switch so that you can choose weather you want battery charged or fan running would be a good idea too.
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure
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#4
11th March 2015, 10:04 AM
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How about making a little temp based change over ciecuit, I'm sure there must be something like that available from Maplin.
So on vey hot days it switches to cool the cabin on other days just charge the battery
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Del
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#5
11th March 2015, 11:38 AM
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Just buy a solar trickle charger you push in the cigar lighter?
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1996 A8 4.2 QS. Bose, Solar roof, um...um... rally sport towbar. Now gone to a new home as the Traders 8. Bright yellow bus o love.
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#6
11th March 2015, 12:14 PM
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Quote:
The reason it does not work is the battery controller, it blocks the current flow to the battery with the ignition off. The controller is quiet complex and even with the engine running can stop the alternator from charging the battery when it reaches full charge, its why you must use the correct connections when charging at home with the battery in situ.
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Manny 2004 A4 1.8T Sport Cabriolet, 89K Miles Past 2004 D3 A8 3.7 Quattro, Xenon, Bose, Blinds, Solar Sunroof, TV, ACC, phone and almost every option. 168K miles rising slowly with retrofit AMI and DVB-T in place of Analogue 2003 Volvo S60 D5 SE Manual, 197K miles. 2001 D2 A8 3.7 QS, Bi-Xenon, Bose, Blinds, Electric Everything, retrofitted RNS-D, 191K Miles
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#7
15th March 2015, 05:56 PM
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I don't think those solar chargers work very well.
I got a AA one with ODB socket and battery socket. I connected it to a spare battery in the garage and over a week I checked the voltage in the battery. Day one the battery was as 10 volts. By day 7 it was was 11.5. The battery is less than 6 months old, so its not the battery. Guy, You can buy 12v solar charger control units for caravans and such. I think one of them will work fine connected to the battery correctly.
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[center] 06 3.0TDI Quattro: Options: Soft close Doors & Boot, Electric Blinds, Keyless Entry & Start, Bluetooth HandFree, Quad Zone Climate, APS+, 3 Spoke Sports Tiptronic Multi Function Steering Wheel, Heated Seats All Round, Black Leather Comfort Seats, AMI, Sunroof, Drivers & Passenger Electric Memory Seats, Auto Dimming Mirrors, Bi-Xenons AFS2, Dab, Digital TV, Reversing Camera, AV Inputs, Fridge, Solar Roof, TPMS, facelift rear lights, 3G, remote boot closure, Tow Bar.
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#8
16th March 2015, 05:12 PM
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They are not exactly meant for charging batteries, only to keep it charged. If it provides 0.5 amps on a good bright day then to get 95ah battery from 10-90% charge wold take over 150hrs if it was charging with 100% efficiency. My 3.8A mains charger takes 2.5 days to charge from 25% to 90%.
Edit Just had a quick look at the AA one and it only provides up to 0.2A and up to 12.7V sit it will probably never get battery charged but should help to keep it charged.
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Currently 8less 2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D 8 history: 2006 A8 Sport 4.2TDI quattro SOLD, 1997 S8, reached end of life with gearbox failure Last edited by ainarssems; 16th March 2015 at 05:31 PM.
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#9
17th March 2015, 05:05 PM
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Quote:
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1996 A8 4.2 QS. Bose, Solar roof, um...um... rally sport towbar. Now gone to a new home as the Traders 8. Bright yellow bus o love.
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#10
19th March 2015, 10:39 AM
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But why ?
The D3 battery management is very good, and the amount of current you get from the solar panels is feeble. Id much rather have a cool cabin, than an overly charged battery. Yes, it sounds slightly cool to say your solar panel charges the battery, but its one of the mods that is (a) quite difficult and (b) not actually of any real benefit imo....
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Hybrid Mode
