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Hi all I am planning to build a solar energy farm where by to provide some electricity to some rural family outside Singapore whereby they live in dark after evening. I only know P=VI whereas Power(watt)= Volt X Amp (secondary school knowledge) Look at the http://cgi.ebay.com.sg/30Watt-15w-X-2pcs-a...1QQcmdZViewItem 1)Can anyone tell me if it is enough to power a maybe 18W appliances(small white bulb) using this product. Assume full day charge, How long can it last>>? maybe you can show me the Maths calculation. 2)what does it mean by 12V- 5Amps/50W solar controller & 12V-10Amps/100W solar controller?? 3)If i Add in 2 more battery in parallel mode & change the Battery to those car battery does it mean it can sustain a longer electricity period? 4) Any other ways to add it more power storage efficiently like add in more battery or change solar panel currently is 30 watt? Is 30 watt enough? Thanks in advance for people who can help me in this as this can benefit many people. Currently i am looking at this for myself.... seem useful.