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Power Inverter to charge a battery in a car

Discussion in 'Standard/4k Discussion' started by AngryBird, Mar 17, 2016.

  1. AngryBird

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  2. foxy-stoat

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  3. Techcop50

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  4. eaglegoaltender

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    Here is a video link on the same subject that might help you out............

    Don't get too caught up in the "square or stepped" sign wave versus the "clean or smooth curve" one that others mention.

    The "pure sign wave or clean power" is more for high end electronic equipment you may be powering.
     
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  5. AngryBird

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  6. Air Ontario

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    I have the pure sine wave. Mine is 1000W or 1500W, I'd have to look.
    Got mine for the truck and house(run big screen/satcom receiver).
     
  7. Squirrel!

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  8. AngryBird

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    Sorry, my English is not very good and I did not catch what you mean. Do you suggest not to buy an inverter because of not pure sign wave? I`d appreciate if you could comment this...

    I watched video, that charger looks reliable.
     
  9. Foxtrot Uniform

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  10. Techcop50

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    The P3S ships with the 57 watt charger. I purchased the 100 watt one so I could charge faster.
     
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  11. eaglegoaltender

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    Sorry if I confused you with what I was stating. What I meant was......there is an argument for using "clean power" (pure sine wave) versus "modified sine wave" (square sine) inverters. It doesn't really matter IMO whether it is a "pure or modified" sine wave inverter for charging the "smart battery" since the batteries accomplish control of charging rates etc. via its own internal power management.

    Most common inverters produce a "modified sine wave" (square) and are fine for most applications and are also the most economical. Pure/True sine wave inverters are used for powering up sensitive electrical or electronic items like a laptop computers, stereos, etc.

    Using an inverter to charge your Phantom batteries..........think about the process here. First off you are taking dc power from the car battery to the inverter which converts that to ac power in the inverter - then the Phantom battery charger is converting that back to dc power to charge the battery (dc - ac - dc). The true intent of the inverter is to power ac equipment from a dc source

    For charging the battery that extra step doesn't make sense and is more of a drain on the car battery IMO, not to mention more heat created in the process. For me, the charger in that video seems like the best way to go (if you must re-charge while out in your vehicle). Best and safest choice for me however....is to carry a couple of extra batteries and re-charge back at your home or hotel (when travelling).

    CAUTION: What is of most importance here is..........if you are going to be re-charging in your car immediately after flying.....the LiPo battery is going to be hot before you charge and it is not a good idea safety wise to re-charge a LiPo battery until it has had a chance to cool down somewhat no matter what you are using to charge it up. Placing the LiPo into a LiPo battery safety bag when charging in the field is a good idea. Keep the battery and charger away from direct sunlight (like don't place them on your dash) when re-charging in your vehicle.
     
    #11 eaglegoaltender, Mar 18, 2016
    Last edited: Mar 18, 2016
  12. AngryBird

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    Your answer is very informative and helpful. Thank you.
     
  13. Techcop50

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    Another note: The 100 watt P3P charger comes with an added cord to charge the P3P remote, which is useless to me, I have the P3S. But Amazon sells the "rails" for multiple charging, and I believe the remote control plug would power the rail, letting you charge 2 batteries at once.
    http://www.amazon.com/Charging-Adap...304893&sr=8-3&keywords=phantom+3+battery+dock
    I've been meaning to try it myself, just have not gotten to it.
     
  14. eaglegoaltender

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    Thanks for the link Techcop........the ad for that product seems a bit misleading doesn't it? They make it sound like it charges 3 batteries at once however it also states......

    "Supports simultaneously plug 3 batteries and they will charge one by one, faster and more convenient".

    Meaning: you can plug all 3 batteries in at once (simultaneously plug 3 batteries) but it will only charge them one at a time (and they will charge one by one).

    At least that's the way I see and understand it. What do you think?

    I don't like the idea where you have to "bend the resisters outward" while charging due to any heat transfer between the battery and resistor....over time the resistor wire may break from repeated bending.

    Looks like a neat idea but not for me.
     
  15. Pilot Wings

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    I believe DJI has just released an official car charger.
     
  16. eaglegoaltender

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    I know they had one for the P2 batteries but I haven't seen one for the P3 batteries yet - hope you are right, it is overdue.

    Maybe they are also aware that some will just keep on flying and charging without allowing batteries to cool down prior to charging - hence the delay it producing this type of portable charging.
     
  17. Pilot Wings

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    Check the DJI store. They do have one now for the phantom 3.
     
  18. eaglegoaltender

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    Hey thanks Pilot Wings - they do and here it is.............

    There you go AngryBird..............P3 charger from DJI store - $85.00 us (I know the exchange rate is a killer for you and me also being in Canada)

    By the way that inverter you mentioned would do the job (barely) but if you still plan on using one, I wouldn't use less than a 300w - 400w range inverter - the battery internal power management will take care of the charging rates etc. I still don't see the sense in going dc-ac-dc however - not very efficient and will create heat at your home charger. A dc - dc boost charger is the way to go - like the one in the photo - again don't fly then plug in over an over again or you may end up with no battery or charger from "hot charging"! Good luck.




    [​IMG]
     
  19. AngryBird

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    OK guys thanks for the answers, I`ll probably stick with inverter, because it also be useful for my other devices.
    I found one 350w, but do I have to worry if my car be able to produce such a power?
     
  20. eaglegoaltender

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    The intent of the inverter is to supply you with enough power to operate whatever it is connected to........the 350w inverter is plenty for what you are using it for - considering the inverter will use about 15% - 20 % of the input power to operate itself, that leaves you with basically a 260w - 280w output.

    You should always purchase an inverter that is rated around 20% - 25% higher than what you need....The Phantom charger with a 1.8amp input rating calculates out roughly to around 200w required for it to operate properly. Hence, leaving you with 60w-80w unused wattage which is ok since that is 30% more than what you need.

    NOTE: If you are plugging the inverter into a cigarette lighter socket in your vehicle what you must consider and more to your question is......can it handle the load - check the fuse for the cigarette lighter in your vehicle (if that is what you are using to plug the inverter into).

    e.g. 10amp fuse will handle inverter load up to 120w.........15amp fuse, up to 180w.......and a 20amp fuse up to 240w. So if you have a 20amp fuse for the cigarette lighter (again, if you are using this to plug your inverter into) you should be ok since you are only using 200w inverter load. Depending on the inverter brand you have you might get away with a 15amp fuse.

    Before you ask.....LOL......the answer is NO....do not replace a lower amp fuse with a higher one. For example if you bumped up a 10amp fuse to a 20amp fuse - the wiring will overheat and possibly burn up!

    How long can you use the vehicle battery charge for with the inverter plugged in...........?

    You have to find out what the amp hours are for your 12v car battery which determines how long you can operate the inverter for before draining your vehicle battery. Of course this is dependent also on what you are using the inverter for (load). On average......a 12v car battery supplies around 80 amp hours, since you would use roughly 200w to power the charger that would give you roughly 4 hours of operating time (this is without the car engine running and supplying no constant charge from the alternator to the battery). You should go online or ask you battery supplier and check the OEM for the battery you have as to actual amp hours since batteries are different from one brand to another.

    Car batteries are not "deep cycle" batteries, marine batteries are "deep cycle" batteries and are for use where you don't need a constant recharge like you car battery does and gets while driving. We all know that once the alternator dies in our cars we don't get very far before it stops.....whereas a "deep cycle" battery (marine) can go all day without a constant charging while you are out boating.

    If you have your vehicle running while using the inverter and whatever it is powering up....that can get expensive considering gas usage and cost for same. So it might even be worth considering buying a separate deep cycle (marine) battery and having that in your trunk to use for the inverter and whatever it is connected to....this will likely work all day for you, then you just recharge it up and leave it for the next time.

    EDIT: disclaimer, I am not advocating or advising application of any of the above as to being factual or accurate with regard to what an electrical or techinical specialist might offer......this is based only on my own limited knowledge of same!
     
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