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inverter - How long will a car battery with 220v inverter last?

schranz21 52836 6
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 16278201
    schranz21
    Level 9  
    Hey. I would like to know how long a 12v 74ah battery will last. Taken out of the car, i.e. without charging. On a 12v-220v / 1000W converter connected to it, e.g. to which a laptop will be connected. Parameters on the laptop adapter are: Input: 100-240v 1.5A 50 / 60Hz Output: 19v 4.74A. And it draws 90W because I checked the power consumption meter. Thank you for your help
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  • #2 16278230
    dedito
    Level 39  
    Measure the current on the battery side, then divide the 74Ah capacity by the measurement result in amperes, you will get the theoretical operating time of the set.
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  • #3 16278265
    sanfran
    Network and Internet specialist  
    Little attention here. I have a similar system that has implemented protection against complete battery discharge and the inverter will shut down if the battery voltage is lower than a certain value. It is about leaving energy in the battery to start the engine without fear.
    So, the inverter may not use the full capacity of the battery, so in addition to theory, you still need to test it in practice.
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  • #4 16278276
    Wlodek22
    Level 31  
    It depends on the condition of the battery and its current level of charge. Assuming 70% capacity and 70% charge, this inverter, with a load of about 10A can withstand about 2.5-3h.
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  • #6 16278643
    sanfran
    Network and Internet specialist  
    It all depends on the efficiency of the inverter, the behavior of the battery under load, and the inverter shutdown voltage (if any).
    It's hard to count.
  • #7 16278667
    maurycy123
    Conditionally unlocked  
    schranz21 wrote:
    To which the laptop will be connected.
    If the inverter is to be used only to power the laptop, buy a suitable car adapter. In this case, it is shooting from a cannon to a mosquito. Unless you plan to use the inverter for other purposes.
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Topic summary

The discussion revolves around estimating the operational duration of a 12V 74Ah car battery when connected to a 220V inverter, specifically for powering a laptop that consumes approximately 90W. Key factors influencing battery life include the inverter's efficiency, the battery's condition and charge level, and any built-in discharge protection features of the inverter. Users suggest measuring the current draw to calculate theoretical runtime, which could be around 2.5-3 hours under certain conditions. Additionally, it is recommended to consider using a dedicated car adapter for the laptop to avoid unnecessary use of the inverter.
Summary generated by the language model.
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