> 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 )
>
>
>
>
>