While the rationing is forecast, It reminds me of the last time we had this. At that time, I designed a 2KVA invertor system from scratch with power MOSFETS which ran on 2 lead acid batteries with an external charger ( 100ah ). This thing ran for 7 hours continuos powering a 30amp load. This time around, no need for that as many things are cheaply available. 

 

noise free minimum requirements, power delivery at least 8 hrs at 40% load :

 

- Power 2 energy saving bulbs. These are the AC philips 8watt ( 40 watt output ). DC load on good quality cable : 0.5amps max each

 

- Laptop and charger. DC load on good quality cable : 2 amps max

 

-  Printer ( inkjet, not laser ) . DC load on good quality cable : 4amps max

 

- Wifi Router. DC load on good quality cable : 0.1 amp max

 

cheap options available :

 

- For lighting, I can use DC flourecent tube 8Watt. These run on 12 VDC. run a separate DC line from the batteries @ 0.2amp each.

 

- Use an invertor or modify a 650VA UPS for AC supply. split the DC and AC circuits while good ventilation is important

 

- Purchase 2 batteries ( 100ah each stacked in parallel, total 200ah ) sealed maintainence free type ( must be in ventilated area )

 

- purchase a single solar panel with line charger or incase of UPS, increase charging transformer size. Or AC charger upto 10amps.

 

sketch :

 

!!!!!!!!!!!!!!!!!!!!!!!!!!!             !!!!!!!!!!!!!!!!!!!!!!!!!!!

!    charging   !------------!    Invertor/    !-----------------AC Output ( fused protection)

!system+batt !            !          UPS   !

!!!!!!!!!!!!!!!!!!!!!!!!!!!            !!!!!!!!!!!!!!!!!!!!!!!!!!!!

         !

         !-------------------------------------------------------------DC Output ( fused protection )

 

 ( correct as necessary )