Good Day everybody. I have an Acer laptop with AC adapter input 100~240V~ 1.6A 50-60Hz I just bought a small truck battery to be use when power goes down (it happen very frequently in my place) I also bought a power inverter which state 500W and 220V. But the problem is, when I plugged in my laptop adapter or any other laptop adapters, it shut down automatically. But when I plugged in desk lamp, or charger several handphones at a time, it worked perfectly. What is the problem actually? Can anyone help me with some solutions or suggestions? Thank you very much for your time. Regards.