Jump to content

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Recommended Posts


I just came back from another sucessful offroad camping trip with the Cayenne, spoilt only by a flat battery, (due to my son going in and out of the car all the time while parked).

I want to get a solar trickle charger for use when the car is parked up for a week or so.

The local auto shop has several, with either aligator clips and/or cigarette lighter adaptors.

What is the best way to trickle charge the battery? through the aligator clips onto the jump posts under the hood, or via the 12V power outlet sockets in the footwell?



Link to comment
Share on other sites

  • Moderators

Cigarette lighters in all Porsche's should be switched independent key or door lock positions, in other words with the key in your pocket and the doors locked.

Link to comment
Share on other sites

  • 1 month later...

I am working overseas and only get to drive my "baby" every couple months. My solution to keep the battery charged was to use an old battery charger with dual mode, 6amp and 2amp, AND an old mechanical timer ((stolen from my wife Christmas tree set up!). I set the charger on low 2amp charge for 5 hours a day. This timing was arbitrary as I have no idea how much battery drain on an idle 997. Clipped directly into the battery terminals in the front trunk as the old charger didn't have a cigarette lighter connection. One issue was the trunk light remained on all time as I could not completely close the trunk with electrical wire hanging out. This could burn out the lamp and or drain the battery further. I resolved this problem by prying out the light assembly (very simple with a screw driver), unclipped the connection, and voila, light off. One unanswered question from me is whether it is harmful to the battery if overcharged. I don't want to face with replacing these expensive batteries every time I come back from overseas.

Link to comment
Share on other sites

  • 3 weeks later...

Ok we went camping again, (these cars are AWESOME offroad - but that's another story).

I connected the solar trickle charger to the power outlet in the rear, and sat the small panel on the roof of the car.

Worked perfectly!

In my car (2003 turbo) the cigarette outlets are switched, so you need to use either of the 12V power outlets in the rear, or the ones in the passenger footwell.

Happy camping!

Darrin Smith

Perth Western Australia

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.