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NavyVet_77

Portable Solar Usb charger_part1

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Items Used: err.. not solar yet

1. Old crap usb cell phone, for testing purposes

2. 4xAAA battery pack from Radio SHack

3. Usb connector end from a automobile cigarette lighter adapter.

 

How it works:

http://www.techlib.com/reference/batteries.html

-USB voltage output = 5v usb is always 5v, Any usb device is expecting roughly 5v input to charge the phone. Even though the battery is of lower voltage.

-1 AAA battery provides 1.5v @ 1000mAh connected in Series. (1.5v x4 = 6v @ 1000mAh = 6000mWh) Meaning it can power a 6watt load for 1hour.

-In my test phone the phone battery is 3.7v@1250mAh = 4625mWh

 

Voltage out of the battery pack needs to be as close to 5v as possible. 6v obviously works. 2xAA will give you more amps than 4xAAA, but the voltage from the 2xAA isnt enuf.

 

Battery pack provides 6000mWh but the phone battery provides 4625mWh. SO the battery pack should be able to provide a little more than 1 full phone recharge. (1.3 recharges)

THis can also be done with AA & C batteries. AA & C have the same voltage as AAA but provide more amps. Meaning you can get more charges out of 4 AAs than 4 AAAs. A 9v battery would change the math on this too much and would likely burn your phone while charging. You'd need a Voltage Regulator to drop the voltage from 9v down to 5v, installed between the battery pack and the phone.

 

Battery pack provides more power than the phone battery can hold, and is a slow strong steady charge. Slap some rechargable batteries in the pack and a solar cell, and you have a easily portable solar usb charger. More to come

 

If you dont feel like tracking the project,just toss the items listed above in your long-term supplies, as an alternate method of charging your usb devices...as you scavenge batteries.

 

THis simple little project can serve as a base for many others

 

[ATTACH=CONFIG]1550[/ATTACH]

My lil vid demo

http://youtu.be/2BdbTgTfaJ4

Edited by NavyVet_77

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SOLar Project Part 2

http://youtu.be/GpaMrOtiSZw

Not done yet. But totally functional. Still need to tweak some 'practicality issues' with all the wires.

Rectifier Jumper Cables let me charge all batteries and any phone/tablet off a 12volt battery. (Car battery/Boat/ATV etc)

Solar Panel ($22) and Battery packs ($2.50ea) were bought from Radio Shack.

Otter Box i think was $25 at Bass Pro

Total of 16 rechargable AAA batteries... $ = stupid

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Actually you could put a resistor in series with the phone to drop 4 volts and be able to use the 9v battery to charge your phone. Ohms law, but I'm too lazy <and the beers aren't helping> to figure out the value right now.

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Ive been calling it a Rectifier the whole time. THis is wrong. Im using a 5volt Voltage Regulator :P A Rectifier is totally different.

 

As i was looking into adding a 9volt source solution, it dawned on me that I already have one. The Regulator. Tested with my Multi-meter. I installed it with the intent of charging off a 12volt source. But the way a Regulator works, is to limit the output voltage. Wether its 12volt or 9volt source, the output voltage from the Regulator is the same 5volts. THe only difference is that the heatsink gets hotter when connected to a 12volt source than it does with a 9volt. Video Demo here: http://youtu.be/_wcy2yFcl9M

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Kaito makes a great radio can get tips to charge your phone and such for it

 

I have the model 500 the 600 looks good too are they perfect NO but hey they have 4 ways to power and charge and lots of bands.

 

http://www.amazon.com/s/ref=nb_sb_ss_fb_0_12?url=search-alias%3Daps&field-keywords=kaito+radios&sprefix=Kaito+radios%2Csporting%2C231

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Kaito makes a great radio can get tips to charge your phone and such for it

 

I have the model 500 the 600 looks good too are they perfect NO but hey they have 4 ways to power and charge and lots of bands.

 

http://www.amazon.com/s/ref=nb_sb_ss_fb_0_12?url=search-alias%3Daps&field-keywords=kaito+radios&sprefix=Kaito+radios%2Csporting%2C231

'>http://www.amazon.com/s/ref=nb_sb_ss_fb_0_12?url=search-alias%3Daps&field-keywords=kaito+radios&sprefix=Kaito+radios%2Csporting%2C231

 

forgot to mention I like the 500 because it is not digital tuning

 

here is their site

http://kaitousa.com/radios.htm

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NaveyVet77..

Excelent right there!!!

 

Ok Im in ....can't have enough recharable system's.....or batterys.

 

Good Job..B)

 

I was looking at the ZZ stove that Rick has...

 

how about a small 'computer' fan hooked up to the battery pack?

Use it with My swiss Volcano stove..???

What do you think????

Edited by 101matt

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SolarProject part4

http://youtu.be/QktxRdB_bOg

 

Removed a cpl of the 4AAA packs to make room for other power sources. SO im adding a 4AA pack and added a 9volt source as suggested by VonBayern.

 

THat leaves me room still from the other 4AA pack that i removed to add a old BLackberry usb charger which has fold-down plugs for 120v wall plug.

 

Adding a second 6volt Solar panel will give enough output voltage to recharge a 9volt source.

 

Made some corrections to my math. All AAA & AA batteries im using are 1.2volt rather than 1.5. Making the battery pack output 4.8volt rather than 6volt. This reduction in power is not a problem, itll just take a little longer to charge things than i had first thought. Cellphone batteries are typically around 3.7volt

 

THis 6-12v solar array does not reguire diodes to be installed.. here is why:

HOME Solar arrays, providing higher voltage, require diodes to be installed , in Series with the positive terminal, to prevent reverse power flow from the batteries to the SOlar panels. BUT being that the voltage output of these particular panels is so low, the power loss from the Diode itself in the form of heat, would negate much of the usefulness of the panels. WHat little reverse flow there is from the batteries will be negligible and can easily be nullified by installing a master on/off switch between the batteries and the panels.

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101matt,

I've never seen one. I looked it up. Sounds like it has a simple heat element to allow lighting various fuels. Kinda like a pilot light on a stove/water heater.

 

So.. could be useful. A portable camp stove with a pilot light? Ya, anything thatll make 'roughing it' less rough.

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Still working on stuff. ive run into design issues. basically not enuf room in the otterbox for all the function i want.

just wanted to share a little tip for anyone who uses the 'battery holders' like i do.

Drop a little dot or 2 of Solder on the negative terminals (springs). THey pop of really easy if you're not particularly gentle when pull the batteries out.

 

THat would just really suk to have your negative terminals pop off when you dont have access to a method to repair it.

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