Notes: Inverter purchasing calculations for home

 Take a list of items that will run in inverter like 2fans, 1 LED tubelight, 1 laptop, 2 LED TV, etc

Now calcullate sum of their power e.g 2*60+1*20+100+2*100 WH=440 WH

Now add 25% to above power sum e.g 440*125%=550WH

Then multiply it by power factor (most case it's 1/0.8) e.g 550/.08=687.5 WH

For every inverter has its own effeiency say 90%,80%, etc

Therefore, inverter power that has to be purchased = 687.5/90%=763.888 VA

Above is how to calculate inverter power that has to be purchased.

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Now comes how to choose battery power

Batter power (VA) =  Home Load * Backup (hrs)/Battery Vold

= 687.5WH*2hr/12amp = 114.58

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This is how you do calculations for purchasing invertor

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Bibliography

Ubuntu Notes: Solve E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem when trying to update ubuntu

This the problem you face when you try to upgrade or update ubuntu using command line, you get this message.

Again when you run 'sudo dpkg --configure -a'  command you get error message like 

dpkg: error: parsing file '/var/lib/dpkg/updates/0019' near line 0:

 newline in field name '#padding'

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To solve this run command as follows

cd /var/lib/dpkg/updates && sudo rm -rf <refNo>;
sudo dpkg --configure -a;

Like in above question case run command as follows

cd /var/lib/dpkg/updates && sudo rm -rf 0019;
sudo dpkg --configure -a;

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Thats all & problem will be solved