The Forum » Batteries, Power Supplies and Solar Systems > sunny days
Login Register Search Recent Posts

Isaac35064

Posted: 28 January 2004 9:35 AM
 

Member Since:
1 December 2003
Posts: 19
Points: 0


why waist the suns ubundant energy when you can make a battery charger!Anybody made any these holidays? 1 pt For points... How many watts of solar energy hit the earth at the equator per metre square? How many watts in Timaru (45 sth) How many watts does a solar panel put out per metre square so what is the efficiency etc? Andrew
============================================================


Adrian

Posted: 28 January 2004 10:23 PM
 

Member Since:
8 October 2003
Posts: 991
Points: 123


Yes Isaac i was really interested with Solar Energy in the holidays. I was even going to make my own solar cooker lol. lots of techniques and experiments @ http://solarcooking.org/ I never got round to it though. Though I think that If i actually got my hands on some cheap tin foil and cardboard boxes from the supermarket I think I could have done it. I even requested two solar cells which are 1.0V 200mA. I found that I couldn't find an application for them. But that isn't to say that they're wasted. Maybe later on in the year I might build a solar powered Beam robot. again, more info @ http://www.solarbotics.com/ they have nice resources about BEAM robots. Unfortunately, many Solar applications require large amounts of solar panels and stuff, and as you know solar panels etc don't come cheaply. Solar Powered battery chargers aren't all that useful because the time it takes to charge up a cell isn't definite and depending on size, they are slower and do not give as full a charge as a normal plug-in-wall charger would. If you wanted to make something cheap, used the sun I suggest you make a solar cooker. Great project with eatable results Adrian 2pts
============================================================
Adrian

Adrian

Posted: 30 January 2004 5:34 PM
 

Member Since:
8 October 2003
Posts: 991
Points: 123


#1. 1.36 kilowatts of power per square metre near the equator http://www.sunwind.ca/solar/solar_energy_education.html #2. Timaru district covers '2,602 square kilometres' 2602km^2 = 51km x 51km 51km = 51000m therefore Area of Timaru in sq meters = 2602000000 sq.metres If the same amount of energy which falls on the equator falls on Timaru, then the amount of energy which falls in the Timaru district is: 2602000000 x 1360 = 3538720000000 watts or 3.54 x10^12W (3sf) but as we know, beacuse of the Earth's axis, the amount of energy which falls on the Timaru district is much less than the energy which falls on the equator. So in reality, the value (3.54 x10^12W) is much less. http://www.timaru.govt.nz/index.asp?sidenav=tdnav.html&mainpage=td #3. It depends on the type of solar panel. http://www.solar-electric.com/kc-120.html This panel covers an area of 0.9291m^2. I will round to 9000cm^2. Because of area of borders. It is rated at 120W. So, for each 0.9m^2, it will output 120W. Therefore each 1m^2 will output: .9 = 120 .45 = 60 (.45 / .9) x 120 = 60W (1 / .9) x 120 = 133.33W Or 120 / 0.9 = 133.3(recurring) Effeciency = (Energy Output / Energy Input) x 100 Energy Input = 1360W (energy @ equator per sq.m) Energy Output = 133.3W (per sq. m) Effeciency = 9.8% = 10% (1sf) The KC120 is 10% effecient. I hope this is worth a lot of points. I've done a lot of work on this!!! Adrian 3 pts
============================================================
Adrian

Rorence

Posted: 11 July 2017 3:58 PM
 

Member Since:
2 May 2017
Posts: 7
Points: 10


This post was awarded 1 point!

To battery charger, the only one that I have used is 300w DC 12v to AC 110v power inverter from bestek. I have used this charger to charge camera battery when camping outside. Easy to connect with car cigarette lighter charger outlet, then you can charge it safely. Now you can get it on discount price, since there is a activity on Amazon Prime day. Just search this tool on bestek Amazon store. Hope this tip is useful to you. Warm regards. 



Caleb7

Posted: 11 July 2017 10:58 PM
 

Member Since:
10 September 2011
Posts: 934
Points: 737


This post was awarded 1 point!

Hi Rorence,

Please note the date at which the thread was made before posting a reply. This one is from 13 years a go so if you want to continue this discussion make a new topic which more users will see.

Thanks :)


============================================================
CalebB - Moderator

You need to be a member to post.