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DC inverter question.

  • 01-10-2019 04:42PM
    #1
    quartz1
    Registered Users, Registered Users 2 Posts: 396 ✭✭


    Can anyone tell me how long a 500w 12 volt to AC inverter connected to a 70 Ah battery / 840 Wh Battery would power a 100 Watt bulb approx and how to make the calculation. Thanks


Comments

  • #2
    westyIrl
    Registered Users, Registered Users 2 Posts: 510 ✭✭✭westyIrl


    quartz1 wrote: »
    Can anyone tell me how long a 500w 12 volt to AC inverter connected to a 70 Ah battery / 840 Wh Battery would power a 100 Watt bulb approx and how to make the calculation. Thanks

    A while since I've done this but I'll bite.

    840Wh means it would run a 100 Watt load for 8.4 hours. (by definition: Watts x hours=watt-hours)

    However, whichever inverter you choose would have an inherent efficiency rating due to heat/noise losses(say maybe 75% as a real rough estimate)

    So approx 8.4x0.75=6.3 hours assuming above efficiency. Hope that makes sense



    Jim


  • #3
    adrian92
    Registered Users, Registered Users 2 Posts: 566 ✭✭✭adrian92


    quartz1 wrote: »
    Can anyone tell me how long a 500w 12 volt to AC inverter connected to a 70 Ah battery / 840 Wh Battery would power a 100 Watt bulb approx and how to make the calculation. Thanks

    Jim is correct, in my view.
    (Assuming that the battery is in good condition)


  • #4
    quartz1
    Registered Users, Registered Users 2 Posts: 396 ✭✭quartz1


    Thanks for that guys ...I bought a battery and inverter to power a few lights should the power be down but I didnt know how long it would last. I would use some low watt LEDs. Thanks for taking the time to reply.


  • #5
    adrian92
    Registered Users, Registered Users 2 Posts: 566 ✭✭✭adrian92


    Thanks,

    It might be good to keep that battery charged, it can be easy to forget about it and it can degrade.


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