that is roughly this big
http://cgi.ebay.com/800mah-Solar-Mobile-Power-panel-Charger-for-3G-Iphone_W0QQitemZ110419658273QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item19b5864621
using it to power a high drain item??
How would a solar panel that is handle this situation?
Posted on 02 February 2012 by admin
I’m building a solar battery charger. Am I doing this right?
Posted on 13 January 2012 by admin
I’m building a solar setup to mount on my bike so I can keep my phone/laptop charged while on long rides. I’d like to know if I’ve got my facts straight. It’s been a long time since high school science class.
I’ve got 8 rechargeable AAs (I don’t need to store that much power. I will almost always be riding in the sun.). My solar panel has a built-in charge controller that puts out 12v. I’ll connect the AAs in series. 8 AAs x 1.5v = 12v, so the solar panel’s 12 volts should charge them properly, am I correct?
Thanks a lot
Is this telescope for children or for adults or for both?
Posted on 04 November 2011 by admin
I just bought my girlfriend who is 21 years old a telescope for Christmas. She is not pursuing a career in astronomy, but she is totally fascinated by space, so I decided this year to get her a nice telescope. I was searching the internet for info on telescopes but I have zero knowledge of what to get, so I found a really cute, and decent (I guess) telescope. Here is the picture and info.
http://www.amazon.com/TwinStar-AstroMark-Tripod-Refractor-Telescope/dp/B001LT552C
I bought it off ebay for about 160 bucks and its pink so I figured what the heck, I’ll get her that one, its not complicated but its not cheap looking one either.
I just want her to be able to see the planets, moon, and other things orbiting our solar system clear and good. But now I see from other websites saying this is a great telescope for children. My question is basically what does that mean? Is it for kids, because kids don’t really know the difference between whats a good or bad telescope, or for kids because its super light weight and portable? Please help!
I live in Los Angeles, CA
Is charging a 12v battery pack this way ok?
Posted on 02 November 2011 by admin
I want to use my 12v solar panel to charge a 12v battery pack that consists of ten 1.2v, 1300mah NiMh AA batteries. My solar panel typically puts out about 15-19v and 230ma on the high end.
What I would do is use a LM317T voltage regulator and appropriate resistor to limit the current to around 120ma. So I would be treating it as though I’m charging a single 1.2v, 1300mah battery. And keep the charging current at around C/10 so I could leave the battery pack charging all day without a problem. And do a trickle charging to prevent overcharging.
My questions to you are these:
(a) Is charging the battery pack in this manner with this setup ok?
(b) If I were to connect my voltmeter to monitor the charging process, would I need to wait until it shows around 12v or 1.2v? If I were to disconnect the entire pack fully-charged, I know it would give me 12 or more volts. So I’m thinking I would need to see the voltmeter reading at least 12v. But I just want to be sure I’m right on this.
Thanks for all your help!
FYI, I don’t want to use a 12v SLA battery because it would be too heavy and large for my purposes. I need something more smaller and more portable. I have other battery packs with different configurations that I want to charge in the same way. And would either use a variable resistor that I can adjust to keep the charging current at C/10 for each battery pack. Or I would use separate voltage regulators with appropriate resistors to maintain a charging current of C/10 for that particular battery pack.
And on a side note, I’m surprised there isn’t a rechargeable 12v CR23a battery on the market. If there is, I haven’t found one anywhere.
Help in summarizing this?
Posted on 29 October 2011 by admin
The history of the development of electrochemical cells is crucial to the scientific study and industrial applications of electricity, for prior to the rise of electrical grids around the end of the 19th century, they were the main source of electricity. Successive improvements in battery technology permitted the rise of major electrical advances, from early scientific study to the rise of telegraphs and portable electronics.In 1749, Benjamin Franklin first used the term “battery” to described a set of linked capacitors he used for his experiments with electricity. These capacitors were panels of glass coated with metal on each surface.[1] These capacitors were charged with a static generator and discharged by touching metal to their electrode. Linking them together in a “battery” gave a stronger discharge.
However, Alessandro Volta, a friend and fellow scientist, disagreed, believing this phenomenon was actually caused by two different metals being joined together by a moist intermediary. He experimentally verified this hypothesis, and published it in 1791. In 1800 Volta invented the first true battery which came to be known as the Voltaic Pile.
Consumable dry cells are sold in a great rate ,they are used in different fields and they are available in a variety of sizes,emf values,….etc.consumable dry cells are not recycled,they are thrown without having a special treatment because batteries contain toxic elements inside it so they need a special factories by which we can safely get rid of them.these dry cells nowadays are an important factor that causes pollution,so the world started to search for sources that are less polluting and are not limited by supply.there are many alternative sources the humanity nowadays is using as solar energy,wind energy,hydroelectric energy,geothermal energy,ocean energy…..etc.
Solar energy is one of the most important alternative energy sources,and relating this field to batteries solar energy helped in decreasing the use of the dry cells by inventing the solar batteries .
Will you give this solar energy idea to your parents?
Posted on 13 October 2011 by admin
1. Solar Energy Concept: To some this idea may seem morose or even silly, however I believe an engineer would appreciate its value as would anyone who had the good sense to recognize a free multi-billion dollar concept. The idea is to replace the headstones in cemeteries with solar panels that have been etched with the deceased’s information, in any participating cemetery. The panel would be the length and width of the grave. At the base of the grave you would have a small placard. The land that the solar panel is placed on is effectively free, since the plot has been purchased for the deceased. The cost of the panel is effectively free, since it’s cost has been subsidized by switching the headstone for the panel.
Most cemeteries are located close to population centers. This one fact alone would allow real gains in actual recoverable energy by reducing line load losses that prohibit solar energy from obtaining a foothold in communities. The panels initial cost would be offset by the savings in not having to purchase the head stone. ( A rock produces no energy! ) The family of the deceased could be rewarded with an annuity that would help recoup burial cost in part and maybe in full! The solar panels would be clean, quiet, portable and easily upgradeable. The panels could be combined with any other energy sink a particular company might choose (fuel cell, flywheel, compressed air, geothermal storage, etc.). Greater return on equity for the cemetery, less green house gases, greater energy security for America and the world, a more robust and distributed energy source, increased productivity, more jobs and reduced or eliminated cost to the bereaved. The potential gains worldwide are enormous.
I wish you and yours good fortune in all endeavors,
This Fully Featured Space s/w Will Make You Rich – 75% Payout.
Posted on 12 September 2011 by admin
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Posted on 12 September 2011 by admin
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iPhone 4 Battery life extender, 2400mAh internal battery, Retractable tangle free USB cable included, Apple Certified!! Don’t buy anything less than 2400mAh it’s a waste of money!! This is the only case Apple certified “Best Quality”
Posted on 18 August 2011 by admin
- Internal battery doubles the run time of the iPhone 4G
- Power up and sync without removing iPhone from case.
- Built-in 2400mAh lithium polymer battery.
- Advanced battery protection technology prevents overcharging.
Product Description
This product, protects phone, insulates antenna, and recharges the iPhone 4G internal battery from rechargable battery built into case…. More >>
Will this setup keep my car battery charged?
Posted on 12 November 2010 by admin
I have a 4w solar panel that’s rated at 250ma short-circut and 230ma operating current. And I have a 12v charge controller. What I was thinking of doing is using the panel to trickle charge my Hyundai Sonata’s battery through the cigarette lighter. I already have a male cigarette lighter plug and know which wire is the positive and which is the negative. But I have 3 questions for you:
(a) Looking at the owner’s manual, it says that the cigarette lighter outlet isn’t active (on) unless the engine is on. So I’m thinking that charging won’t happen when the engine isn’t running. Am I correct here?
(b) Assuming I am correct in (a) and the engine must be running for the cigarette lighter to be working, will the panel when plugged into the lighter help the alternator charge the battery? I’m thinking that the panel would help the alternator out so it doesn’t have to work as hard. But maybe I’m wrong on this so that’s why I thought I would ask.
(c) Is the charge controller even needed with my panel being relatively small? No biggie hooking up the regulator, but I was just thinking I could cut down how much I need to have in the car. So this one is more curiousity than anything.
I also have a side question that you may be able to answer too. Normally, I use NIMH batteries because most of the stuff I do requires relatively low current and voltage. So I use LM317T current regulators to keep the current within my needed range. I was thinking of getting a small SLA battery (either a 6v, 1.2mah or 12v, 1.2mah) to extend the duration of the devices I power with the NIMH and have 3 questions:
(a) Will my 12v charge controller work with a 6v SLA battery? It’s about a $8-10 difference in price so I was wondering if I can save some money. FYI, for my purposes the 6v would be enough.
(b) With SLA batteries, it is more important to regulate the voltage or the current? I’ve heard that it’s the voltage that needs to be monitored. I ask this because I was wondering if I can avoid the charge controller and simply use a LM317T current regulator set low enough for trickle charging. If not, then it’s no biggie using the charge controller. Just thought I could compact things more with the LM317T.
(c) I keep the solar panel leaving up against a window in my house that gets a lot of sun throughout the day. And keep the NIMH batteries on the floor with a wire running up to the window. The room is well ventilated and doesn’t get too hot. Temps can range anywhere from about 60 to 85 degrees F. My question here is this. I know that SLA batteries vent hydrogen gas. Will the sunlight in the room and room temp possibly lead to an explosion? FYI, little light hits the floor area when I keep the batteries. But I don’t know what the tolerance level of the batteries would be. So I thought I would ask you experts out there if I’d be ok. My guess is yes, but I want to make sure.
Thanks in advance for all your help!!
Thanks Lee for your help. I want to avoid having to open the hood at differing times to do the charging. So I was trying to make it easier by doing it through the cigarette lighter.
And fyi, you can configure the LM317T to regulate either voltage or current. I do it all the time to make sure my various size NIMH batteries and devices don’t get too much current. So depending upon your configuration and resistor values, you can regulate the voltage or current. And I understood that trickle charging a SLA battery is supposed to be C/100.
My problem was I wasn’t sure if the engine needing to be running would basically cancel out the positive effect of the solar panel charging the battery. At max, I get 305ma. But generally, it ranges from about 180-270ma.
