My power inverter have one USB port and I use multi (yung bang extension na marami ka makakabit).
That's why I'm still suggesting power inverter hehe. I'll have a picture later on pakita ko sayo. =)
Pag may inverter pa kasi its DC to AC then back to DC unnecessary hehe, pero kung may paggagamitan na appliances na iba then a small power inverter would suffice
Yung DC converter useable rin naman sya sa ibang devices if the tips fit, selectable pa ang voltage