# How to control the current while using "DC-DC XL6009 Adjustable Boost Step-up Power Converter Module Replace LM2577" in a circuit?

I want to power my WiFi modem with my powerbank and the modem's requirements is DC 12V-1A. But my Powerbank has DC 5V-2A that is why I will use a step up converter but how about the Amperes, how can I decrease it to 1A?

We have a terrible electric company and I want to make this so I can still use the internet while there is a power interruption and it takes 6 to 12 hours. Online classes are going on that is why I want to make this.

[DC-DC XL6009 Adjustable Boost Step-up Power Converter Module Replace LM2577] specs: https://shopee.ph/product/201062777/6508449595

So you want the power to the modem ie

12V * 1A = 12W


Then if you divide the power needed by the modem by the 5V of the powerbank you get:

12W / 5V = 2.4A


Now figure that the converter will also use / loose some power so you need a powerbank that supplies a minimum of 3A.

Which means that the powerbank you have is not large enough.

• Can I do something about the default current of the power back to reach the needed ampere or do I really need to have a powerbank that is large enough to support it, or make a battery pack?
– Kyle
Jun 19 '20 at 15:44
• 2 powerbanks in parallel or how about 1 car battery and a solar panel & controller? Jun 19 '20 at 15:50
• 2 powerbanks in parallel? let me try that
– Kyle
Jun 19 '20 at 15:59
• youtube.com/watch?v=IlEnEn7ptmc&t=680s This guy caught my attention but I do not know what other kind of 18650 will I use
– Kyle
Jun 19 '20 at 15:59
• @Kyle why do I need to watch a video? Jun 19 '20 at 16:01