They're isolated electrically (change over relay IIRC). A connection would be nice though, but the D2 solar cells are older tech and only produce about 9V at a decent enough amperage to run the fan.
The D4's use the newer blue cells and are used to charge the battery - that's a nice feature.
As for the battery, it could just be a once off (going flat), but keep an eye on it.
The onset of cold weather will normally finish off an older battery nearing the end of its life.
If it turns out to be a parasitic drain that can't be found through the usual diagnostic method, or the battery goes flat every few days regardless of use (as in driving it every day should keep the battery topped up, but doesn't seem to), look at the alternator.
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Cheers
Marty
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Current:
2001 Audi S8 - Brilliant Black with Black interior, C5 RS6 rims (whenever I actually put them on...), Solar Sunroof, Tinted side and rear glass, RNS-D, Grom, Bose, clunky old phone in arm rest!
2002 Audi S8 - Project
Replacement head coming arrived  thanks to MJ
Silver with Black interior. All features as the '01, with the 'S' mode auto shifter. Dodgey rear tint (need to find a way to get rid of that).
Family:
2009 Volvo XC90 V8 R Design - has a louder more obnoxious exhaust than the S8, sounds great! Love this thing - Q7 was double the price, and certainly not double the car!
Sold:
1997 Audi A4 - Hamilton's Club Sport, Achat Grey (will miss the old girl)
Last edited by 27litres; 24th October 2018 at 12:18 AM.
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