Cheap DIY Fully Automatic AC Inverter / DC UPS

I was travelling from Karachi to Lahore to stay at relative's place, they were facing load shading of 6 to 8 hours daily so due to nature of my work it was necessary for me to have a backup plan like an inverter or UPS as I need to stay online and during those days temperature was a bit hot in Lahore so I decided to make a power backup that can fulfill my needs and provide me backup for 2 to 3 hours at-least.

Step 1: Before Starting

My requirements were:

To charge a laptop
To charge mobile phones and powerup a Charji or Zong internet device(3 phones)
Must have a fan
Must have enough light to light-up a room

I have to keep it with me so it must be small in size and light in weight. By keeping all these things in mind I started working on a solution.

External Accessories

External accessories can be connected with this power house to power-up additional stuff like:

96 LED Extra Bright Light (equals to 3 to 4 energy savers)
Car mobile charging dock for direct 12V mobile charging
Routers, sound systems can be connected with output
Solar charger can be connected to charge battery via solar input

Backup Timings

Charging Time : 2 Hours to 3 Hours max

Output Timings :

Laptop Charging + Fan + LED = 1.6 to 2 Hours max

Fan + LED = 3 to 3.5 Hours

Laptop Charging = 3 to 3.5 Hours

Laptop Charging + Fan + Extra Bright LED = 1.5 Hours max

Fan + Extra Bright LED = 3 to 3.5 Hours

The DC UPS and AC Inverter I have designed is able to handle load of 200 to 250 Watts, it can power a pedestal fan and television at once, it can be powered by external battery and it has ability to charge external battery upto 80Ah. Its fully automatic and its charger will auto shut down when battery gets full.

TECHNICAL ADVANTAGES