Date registered: Dec 2005
Vehicle: W211 E320 Bluetec R129 SL500 - $1300 car ........ Ford F350 6l
Location: CA Bay Area
Mentioned: 9 Post(s)
Quoted: 1046 Post(s)
I assume OP come back from the trip, but I add my experience with dealing with batteries.
I own lot of equipment that sits for months at the time and batteries are the issue.
So for starters, the MB paint is having extremely high value, so protect it any way you can. Putting the car on the sun for battery charging definitely makes no economical sense.
We had several models of MB parked for 5 weeks at the time few times and the factory alarms draw so little, that all the cars always started on their own power after.
For 2 months I would just disconnect the battery. You will have to reset the radio code, windows/sunroof memories and ABS system, but those take only seconds, while getting new battery will definitively take longer. I have batteries disconnected in my motorhome for 11 months at the time and they still hold the charge for the engine start.
Solar panels for charging are good if they work. Cheaper panels don't have voltage regulators, so with lot of sun they can boil the battery dry. Than the technology is still having baby teeth and defective solar panel will kill your battery with short circuit.
Bottom line- disconnected battery will last long months with no additional worry.
BTW -Mercedes put the cigarette lighter via ignition switch, so it is off while parked. Some cars have rear power socket that stay hot with ignition off.
Last edited by Kajtek1; 10-13-2011 at 08:24 AM.