solar backup for computer

[vishwas bhat]

Hi All,

I have a desktop computer, with LCD monitor.

What will be a good solar based solution to have 4-6 hrs backup for this.

Also let me know of the cost for the same.

Thanks & Regards,

        Vishwas

[Manu Sharma]

vishwas bhat wrote:

I have a desktop computer, with LCD monitor. What will be a good solar based solution to have 4-6 hrs backup for this.

There is no off-the-shelf solution for existing computers. You may require a custom solution made up of more than 250W PV panel + battery bank + UPS to provide for approximately 200W (desktop+monitor+modem/router+ups) for 4-5 hrs. 

This will turn out to be so costly -- Rs.21,250 for PV panel itself @ Rs.85/W + inverter + batteries, that you're better off reducing your consumption. 

Consider buying a tablet and charging it with solar panels. Apple's iPad2 is only about 2.5W. That's about 50 to 80 times less power than a desktop.  You'd require a 5 W solar panel for it (for 10 hr back up) which would cost only about Rs.425 at the same rate.

If you replace only half the desktop time with a tablet, you'll reduce your computing power consumption and its carbon footprint drastically.  

As I always say, energy efficiency first renewables later.

Thanks,

Manu

[Chidambaram Cosmic]

Rs.15000/- consisting of 75w solar panel with charge controller with
26AH SMF Battery (Amaron )

WHere is your location ? add freight charges
Regds
Chidambaranathan S
9704169267

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[Manu Sharma]

A 75W panel will generate only so much energy that would allow a desktop to operate for less than 1.5 hr and a 26 AH battery will provide a little more than 1 hr of back up after being fully charged. So you'll need 3 or 4 of these to get 4 to 6 hr back up that is required.

Manu

[Manu Sharma]

I wrote:

A 75W panel will generate only so much energy that would allow a desktop to operate for less than 1.5 hr 

Correction: A 75W panel will generate only so much energy in a day that would allow a desktop to operate for less than 1.5 hr 

 

Manu

[Chidambaram Cosmic]

Practically am using the following configuration:
I hv connected 100AH battery with 100W panel. i used to switch of the
Main supply by 8AM. Low battery indication comes only around 5.30 /6
PM for one Desktop and LCD Monitor (latest small size desktop). The
power consumption is 140w max.

A 100w panel can generate 6Amps per hour (standard) and 6 hours per
day. While battery is discharging, simultaneously battery is also
getting charged in day time and hence am getting longer duration.

Am residing in Hyderabad

Regds

[Manu Sharma]

On Sun, May 27, 2012 at 10:59 PM, Chidambaram Cosmic <cosmic...@gmail.com> wrote:

 

I hv connected 100AH battery with 100W panel. i used to switch of the
Main supply by 8AM.  Low battery indication comes only around  5.30 /6
 PM for one Desktop and LCD Monitor (latest small size desktop).  The
power consumption is 140w max.

You may get this performance if you use the computer only sparingly during the day. 

1 KW PV panel generates about 1480 AC Kwh / yr (after conversion losses) or about 4 units / day in New Delhi. So 100W panel will generate on average about 400 Wh / day. Even with a small monitor (15") desktop that consumes the stated 140 Watts, 100 W panel will allow you less than three hours of operation / day. 

More typically though desktop monitor these days are 18" to 20" or larger. That would take the consumption closer to 200 W. Thus, in order to get 4 to 6hr of back up, as required by Vishwas, one would need at least a 250 W PV panel to generate 1000 Wh / day. 

Manu