Hello DIY lovers,

In this instructable i gonna show to build a power bank that can charge our laptops, mobiles, cameras when we are off-grid. For making this i recycled my ups casing

Step 1: Requirements

Go and collect the following items

20W Solar panel
12v 7.2ah Battery
Arduino Nano
12v to 220v inverter
Usb charging circuit
20x4 lcd display
Usb Female pins
IRF 9540 Mosfet
2N2222 transistor
Lm 35 sensor
Toggle Switches
Necessary stuff like glue, soldering rod etc.

Step 2: Plan

As Shown in the Figure above i am going to connect solar panel and battery to charge control unit.
Usb charging circuit and Inverter will be connected to battery directly

Note: The purpose of the charge control unit is to protect the battery from the overcharging and discharging. You can buy charge control unit for stores or you can make using arduino microcontroller by following this tutorial Link

Step 3: Let's Get Started

First of all open the old ups and remove all components inside it.
Make some cuttings for display and switches as shown in figure
I followed Deba168 for making charge controller unit and connected everything according to the plan