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>Nobody with a modern car or SUV is going to get three hours' runtime for their accessory equipment. Really? I've left the satellite radio playing for hours i

by heywire 11y ago

>Nobody with a modern car or SUV is going to get three hours' runtime for their accessory equipment. Really? I've left the satellite radio playing for hours in my 2011 Hyundai Sonata at moderate volume with no hint of problem starting my car afterwards. It has the premium sound system (including subwoofer) and navigation.

CamperBob2 11y ago
There are always going to be anecdotes to the contrary, but the trend is pretty clearly in the opposite direction. Usually what happens in my case is I forget to turn the headlights from 'Auto' to 'Off.' But even with the lights and fans off I don't tend to see more than 20-30 minutes of operation at most. The car's version of HAL 9000 tries to be conservative and shut things down as soon as the battery voltage goes below about 11.9.
- micaeked 11y ago
  That's also anecdotal.
  - CamperBob2 11y ago
    No, that's a repeatable observation. There's a difference. Look, take it up with Volkswagen AG. They're the ones who designed the electrical system in the car in question. Don't shoot the messenger, but a long term business plan centered around aftermarket car batteries is going to be a challenging play, for these and other reasons.
    - deleted 11y ago
      [deleted]
- ars 11y ago
  Headlight != radio. The headlights can be easily 150watt. I doubt the radio uses more than 15.
  - conjecTech 11y ago
    Those numbers are dead on. Just measured them the other day.
  - toomuchtodo 11y ago
    Are led headlights a similar draw?
    - ars 11y ago
      I am not aware of any led headlights. Not in the US anyway. All the ones I know about have LED only for daytime running lamps and high beams. If there were led headlights (or fluorescent for that matter) you should expect the draw to be about 1/5 that number. That number includes marker and tail lights and those can be LED, so the number would be lower in that case.
      - mzs 11y ago
        DOT approved LED replacements for sealed beams made in USA: http://www.pmlights.com/products.cfm?cId=1&fId=71 http://www.pmlights.com/products.cfm?cId=1&fId=71
      - gambiting 11y ago
        Don't know about US, but many new cars in EU ship with LED headlights(and no, I don't mean daily running lights, I mean the actual headlights) - for example the new Nissan Qashqai. In US it's sold as Nissan Rogue.

by heywire 11y ago

CamperBob2 11y ago

There are always going to be anecdotes to the contrary, but the trend is pretty clearly in the opposite direction. Usually what happens in my case is I forget to turn the headlights from 'Auto' to 'Off.' But even with the lights and fans off I don't tend to see more than 20-30 minutes of operation at most. The car's version of HAL 9000 tries to be conservative and shut things down as soon as the battery voltage goes below about 11.9.

micaeked 11y ago
That's also anecdotal.
- CamperBob2 11y ago
  No, that's a repeatable observation. There's a difference. Look, take it up with Volkswagen AG. They're the ones who designed the electrical system in the car in question. Don't shoot the messenger, but a long term business plan centered around aftermarket car batteries is going to be a challenging play, for these and other reasons.
  - deleted 11y ago
    [deleted]
ars 11y ago
Headlight != radio. The headlights can be easily 150watt. I doubt the radio uses more than 15.
- conjecTech 11y ago
  Those numbers are dead on. Just measured them the other day.
- toomuchtodo 11y ago
  Are led headlights a similar draw?
  - ars 11y ago
    I am not aware of any led headlights. Not in the US anyway. All the ones I know about have LED only for daytime running lamps and high beams. If there were led headlights (or fluorescent for that matter) you should expect the draw to be about 1/5 that number. That number includes marker and tail lights and those can be LED, so the number would be lower in that case.
    - mzs 11y ago
      DOT approved LED replacements for sealed beams made in USA: http://www.pmlights.com/products.cfm?cId=1&fId=71 http://www.pmlights.com/products.cfm?cId=1&fId=71
    - gambiting 11y ago
      Don't know about US, but many new cars in EU ship with LED headlights(and no, I don't mean daily running lights, I mean the actual headlights) - for example the new Nissan Qashqai. In US it's sold as Nissan Rogue.