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How to Calculate Mobile Charger Power Consumption in kWh?

Lagun 19564 16
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 9203491
    Lagun
    Level 10  
    Out of curiosity, I recently wanted to count how much it costs me to charge my mobile phone.
    The phone charges for 2 hours
    It's written on the charger
    INPUT 100-230V DC AC 100mA at 50-6-Hz
    OUTPUT 4.9V DC = 450mA

    I would like to know exactly how to calculate it and then convert it to kilowatt hours. The first to omit all losses, and is it possible to calculate with losses without knowing the cross-section of the core ??
    Please step by step how to do it
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  • #2 9203518
    ogur3k
    Level 33  
    Battery capacity?
    What phone?
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  • #3 9203780
    mrst
    Level 18  
    230V*100mA=23W
    23W*2h=46Wh
    46Wh = 0.046kWh - this is simplified. That's how much it takes on a single charge. (I hope it's the same with chargers as with other devices)
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  • #4 9203820
    ogur3k
    Level 33  
    mrst wrote:
    230V*100mA=23W
    23W*2h=46Wh
    46Wh = 0.046kWh - this is simplified. That's how much it takes on a single charge. (I hope it's the same with chargers as with other devices)


    Now look at the phone and calculate how many Wh the battery has.
    I have SE C702 on hand, 3.6V and 950mAh battery.
    3.6V * 0.95A = 3.42Wh
    Any conclusions?
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  • #5 9203881
    mrst
    Level 18  
    Only that in my opinion the battery disconnected from charging and the charger connected to the mains is a difference. It's not about the batteries, it's about the charger. Lagun provided information about the charger and this should probably be taken into account when calculating its power.
  • #6 9203980
    Lagun
    Level 10  
    It seems so to me too. I have a c902 exactly the same specs. If I have to pay for energy, it's probably about the charger.
    This sums up to the fact that charging the battery with such a charger is 2 groszy, i.e. on average a penny per hour ... not enough something ??
    And a 100W bulb will charge less than 4 cents an hour??
  • #7 9203987
    czesiu
    Level 37  
    The parameters refer to the maximum capacity of the charger, the phone and the battery control the charging current.
    Besides, at 100V it can draw 100mA and at 230V, e.g. 50mA
    In addition, the active power we pay for is not equal to the product of voltage and current.
  • #8 9204028
    lutek2001
    Level 15  
    And how did you calculate the cost per kWh? The price consists of a lot of fixed fees and currently it is not so easy to calculate the exact cost. In my case, the cost, taking into account fixed costs, is about PLN 0.63 per kWh, i.e. a 100W bulb shining for an hour costs PLN 0.63.
  • #9 9204061
    mrst
    Level 18  
    PLN 0.4, if 1 kWh costs PLN 0.40 at your place without additional charges for transmission, etc.
  • #10 9204063
    ogur3k
    Level 33  
    jesus:
    He talks well, as an adult, give him beer! :)

    lagoons:
    So the battery "fits" 3.42Wh, but the charging process is not 100% efficient.
    Let's assume, roughly speaking, that one battery charge consumes about 5-6W.
    If you wanted to calculate it exactly, you would need at least an energy consumption meter. Plus a TrueRMS multimeter.
  • #11 9204109
    mrst
    Level 18  
    Yes, she's right. I calculated the maximum power that this charger can have, not taking into account that the charging process may not be 100% efficient.
  • #12 9204228
    kj1
    Electrician specialist  
    mrst wrote:
    230V*100mA=23W
    23W*2h=46Wh
    46Wh = 0.046kWh - this is simplified. That's how much it takes on a single charge. (I hope it's the same with chargers as with other devices)


    And why 230V and not 100V?

    Let's check the output:
    4.9Vx0.45A=2.2Wx2h=4.4Wh

    10% charger efficiency? It's probably a bit small (Anyway, at 100V it comes out to 20%, which is also too little in my opinion).

    You would simply need to measure the current drawn by the charger while charging.
  • #13 9204250
    mrst
    Level 18  
    230V because I counted the maximum power that this charger can have.
  • #14 9204259
    ogur3k
    Level 33  
    kj1 wrote:

    You would simply need to measure the current drawn by the charger while charging.

    It is a pity that this current changes during the entire charging process ...

    He could measure every 10 minutes and average, but who knows what would come of it ;)


    lagoons:
    Get yourself a CST-75 charger, C702 off from 0 to 100% charges about 1 hour. On about 1h15m.
    Btw. good avatar, the work of Cyriac?
  • #15 9204442
    :
    Level 20  
    Lagun wrote:
    It's written on the charger
    INPUT 100-230V DC AC 100mA at 50-6-Hz
    OUTPUT 4.9V DC = 450mA

    Let's calculate the efficiency of the charger, assuming that 100mA is a continuous current and effective:
    (4.9*0.45)/(230*0.1)=9.5%
    Who has seen such crap for this, probably in impulse technology?
    Simple conclusion, 100mA is not what some people think...
  • #16 9205078
    Lagun
    Level 10  
    Well, I see that I am very green in these matters, but I understand it :)
    So, it's impossible to measure exactly - we already know that. And PI times the door - yes. Okay then.
    I can see that this seemingly trivial thing turned into quite a serious case ;P

    As for the avatar, thanks, but I have no idea whose work it is ;)
  • #17 9205378
    Mariusz Ch.
    VIP Meritorious for electroda.pl  
    Regulations, points 8.1, 8.3, 10.5, 16.
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Topic summary

The discussion revolves around calculating the power consumption of a mobile phone charger. The user seeks to determine the cost of charging their phone, which charges for 2 hours with a charger rated at 4.9V and 450mA output. Various participants provide calculations, noting that the input power can be approximated as 230V * 100mA = 23W, leading to an estimated consumption of 0.046 kWh for a single charge. However, they emphasize that the charging process is not 100% efficient, with estimates suggesting efficiency rates around 9.5%. Participants also discuss the importance of measuring actual current draw during charging for accurate calculations and mention that fixed costs can complicate the calculation of energy costs. The conversation highlights the need for precise measurements and considerations of charger specifications and battery capacities.
Summary generated by the language model.
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