Forum Discussion

LaneW's avatar
LaneW
Explorer
Jan 28, 2023

Inverter and battery sizing to power my camper microwave

So, I am getting all sorts of misinformation on this and hope someone can give me correct scoop.

I am planning to replace my LA battery in my truck camper with two, 100 ah Lithium batts (probably SOK). I also need to install an inverter, really just to run my microwave. It’s a 900 watt MW that draws 1350 w according to the manual. Looking at a couple of 2000 watt pure sine inverters. But I am getting conflicting info, even from the manufacturers, as to whether two 100ah lithiums and a 2000 w inverter will be adequate to run the microwave .

Does anyone have definitive information on this question, or can you point me to a truly reliable source for answers?

Thanks in advance!
Truck Campers
  • srschang's avatar
    srschang
    Nomad
    Jan 28, 2023
    I have 2 100ah lithium batteries and a 2000w Xantrex inverter. It runs the microwave no problem. Just don't try to make toast while microwaving something else. That didn't work.
  • greenno's avatar
    greenno
    Explorer
    Jan 28, 2023
    Sure it will run your micro, it will just deplete your battery's.

    Do the easy math. Theoretically here ya go. Not figuring the inverter loss while operating.

    2 x 100ahr lithium batteries equals 200 hrs total availible at 100% discharge which you dont want to do.
    I think 90% is acceptable but not recommended.

    So you have 180ahrs availability right?

    Microwave will draw 1350 max at 120vac still with me?

    Inverter is rated for 2k so your good there.

    Micro will draw max 11.25 amps at 120vac.

    Inverter converting to DC you will use 112.5ahrs of battery capacity using the micro for 1 hr. And you only had 180ahrs.

    So using the micro for like 15 minutes will deplete your battery's approx 28ahrs or so which would be about 15% capacity.

    Now you will need a way to recharge those battery's to get back to full state. Either by battery charger , solar etc.

    Good luck and dont burn the popcorn.

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