I bought this charger to use as a power source in a multi-port charging station for tablets and phones and it works much better than the small power adapter that came with the unit. I don't know how to calculate the amount of energy needed to charge our family's devices, but I do know that our old power bank will replace all our old i phones and Android devices in one night, and my new Samsung Galaxy s9 only charge about 70%. This is with my s9 and 3 or 4 android phones connected at the same time. Thanks to the new, more powerful charger, all our devices are charged in just a few hours. When I plug my s9 directly it goes from 20% to 100% in less than an hour. So far, I am very satisfied. Also, the cord on this thing is longer than my other changers and is relatively heavy. I also like the velcro that attaches to the cord.
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