Page 3 of 3 FirstFirst 123
Results 21 to 27 of 27

Thread: Integrate Solar Energy in your CarPC Project

  1. #21
    FLAC hexxamillion's Avatar
    Join Date
    Dec 2007
    Location
    AZ
    Posts
    1,095
    Nice use of solar power. I plan on using something a little less obtrusive and safe for the front but nice idea for the panel in the roof. I thought of something like that but not too sure how I could implement that without it being too odd. Not sure if they have roof storage racks for an Altima, but I'm sure there must be some aftermarket kits..that may be a great idea.
    "Live Free!!!...It's all about Open Source"
    Current Proj:Android Mount in 2013 Altima
    Old Proj II
    Old Proj I
    YouTube:Project Videos
    Homepage: HexxWorld.net
    Twitter:http://twitter.com/hexxamillion

  2. #22
    FLAC freeflashstuff's Avatar
    Join Date
    May 2008
    Location
    Socorro, New Mexico, United States
    Posts
    1,141
    But keep in mind that those roof-mount storage racks will drop your overall gas mileage.
    I have bad luck with vehicles...

  3. #23
    FLAC hexxamillion's Avatar
    Join Date
    Dec 2007
    Location
    AZ
    Posts
    1,095
    Good point
    "Live Free!!!...It's all about Open Source"
    Current Proj:Android Mount in 2013 Altima
    Old Proj II
    Old Proj I
    YouTube:Project Videos
    Homepage: HexxWorld.net
    Twitter:http://twitter.com/hexxamillion

  4. #24
    FLAC
    Join Date
    Jun 2006
    Location
    Calgary, Alberta
    Posts
    1,237
    Blog Entries
    1
    Have you thought about security and potential theft with solar panels out in the open like that?

  5. #25
    FLAC hexxamillion's Avatar
    Join Date
    Dec 2007
    Location
    AZ
    Posts
    1,095
    No doubt that's also a concern.
    "Live Free!!!...It's all about Open Source"
    Current Proj:Android Mount in 2013 Altima
    Old Proj II
    Old Proj I
    YouTube:Project Videos
    Homepage: HexxWorld.net
    Twitter:http://twitter.com/hexxamillion

  6. #26
    Raw Wave
    Join Date
    Nov 2009
    Posts
    2,118

    Solar is only 1kW per square meter...

    Sorry for the old bump....
    But keep in mind that solar energy is about 1kW per square meter - close enough to 100W per square foot.

    Solar panels may be 25% efficient if pointing at the sun uninhibited. That's 25W per sq'.
    Being 3 degrees off the sun is about a 5% output drop, and it drop off quickly when off 5 degrees or more (ie, sun is > 5 degrees normal (perpendicular) to the panel face).


    As to "free energy", money-wise, a solar panel typically takes at least 15 years to repay itself. Longer when talking small panels (under say 80W) and including peripheral equipment (batteries, inverters, regulators etc).
    Energy-wise - if you tell me how much energy it takes to manufacture & ship a solar panel... well, then you can probably figure it out too.

    But there are some good cheap regulators. I use one that costs about USD$20 and handles at least 120W - maybe even 300W (I'd have to check). It isolates the panels from the battery above 14.5V etc.

    As to why anyone would want to add solar power to a car for this purpose perplexes me - other than for the fun of it. Solar power to charge hybrid vehicle batteries - yes.
    But to charge or power a 90W load, or even less for recharging? Does the power saved from the alternator outweigh the extra gas used in accelerating the panels peripherals?
    Granted, the panel payback from gas-generated electricity may be down to 5 years from 15, but still...?
    At least nobody with a big sound system would consider this to save gas! Phew!


    Safety Update:
    ramaloji's implementation above is illegal in Australia.
    Internal batteries must be sealed else in a sealed enclosure vented top the outside (hydrogen gas liberation, acid spills, etc).
    And if ramaloji drives anything like me, those wet cell are gonna splash big time! (Hence why such loads (no pun) should be central else forward in the vehicle.)

    Furthermore, ramaloji's parallel battery implementation is asking for trouble. Any cell failure will bring other monoblocks down (equalisation) and eventually failure (through constant discharge to 5/6ths monoblock voltage) and lots of gassing (eg - 5 cells with a 6-cell charging voltage).
    Two parallel batteries are bad enough, but four?
    Al least being wet (or sealed) lead acid, they are unlikely to experience thermal runaway as would AGM/VRLAs/ Now that's a nice red glow!


    Regarding the previously mentioned eeeuser-36643 Solar Panel powered EEE thread.
    DO NOT trust Rapture's answers (2nd Reply #27 Here)! EG - Paralleling a 12V car battery & Li-Ion 9V battery is not called "charge equalisation", that is called "EXPLOSION!".
    Earlier, both shadyman & zeo mentioned explosions from incorrect charging - imagine connecting to a another (higher voltage) battery which is a much bigger current source!
    Charge Equalisation refers to the same batteries connected in parallel if using his analogy, though it generally pertains to charging methods that "equalise" batteries irrespective of series or parallel connection.
    As to suggesting the capacitor array (in parallel with batteries!).....

    As to Rapture's "V=IR, so lowering the voltage would increase amperage" - if he is talking about transformers or non-linear devices like SMPS-type DC-DC converters and similar constant power loads, then YES. But NOT simple linear voltage regulators and linear loads.

    Rapture was responding smadge's earlier inquiry which opens "....if I put the 2 solar panels in parallel.... possibly damaging to any car adapters".
    FYI - No it won't. As long as the voltage is acceptable, the load determines how much current it will take.
    A car battery won't blow a 12V 250mA bulb (3W) any more than it will a 100W bulb or 1000W amp.

  7. #27
    FLAC hexxamillion's Avatar
    Join Date
    Dec 2007
    Location
    AZ
    Posts
    1,095
    Good points
    "Live Free!!!...It's all about Open Source"
    Current Proj:Android Mount in 2013 Altima
    Old Proj II
    Old Proj I
    YouTube:Project Videos
    Homepage: HexxWorld.net
    Twitter:http://twitter.com/hexxamillion

Page 3 of 3 FirstFirst 123

Similar Threads

  1. HOW TO:use opus with a laptop......
    By turbocad6 in forum Power Supplies
    Replies: 24
    Last Post: 06-25-2009, 06:31 AM
  2. How can I use a laptop as a carpc?
    By turbocad6 in forum Laptops, Netbooks, Tablets, UMPCs, etc.
    Replies: 0
    Last Post: 07-11-2007, 12:55 AM
  3. Solar tickle charge?
    By R5Paulie in forum Power Supplies
    Replies: 1
    Last Post: 06-06-2007, 10:12 AM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •