Here's a real quick and easy tutorial on making a 'Portable Solar Phone Charger', it only took me 5 minutes to make one! It's powered by PURE solar energy. The device is designed to fit right into your pocket, it also comes with a built-in stand! Works with apple devices (tested on iPod Touch and Quadcore Android Phone) How Does It Work? - Solar powered chargers and powerbanks are pretty common these days. These devices usually have battery reservoirs inside them, to cut it short they are not 100% solar powered so as being eco-friendly. These products are gimmicks, they defeat the purpose of being 100% green and eco-friendly.
My DIY tutorial will teach you how to make a '100% PURE Solar Phone Charger'. Feel free to be independent from the power grid:D My Review: (Pure Solar vs. Solar+Battery) 100% Pure Solar: (Pros) 100% Pure Solar: (Cons) - 100% eco-friendly - Can only charge devices during day - No need for charging internal bat. - May Not Work with TABLETS (High Amp.
Devices) - Independent From The Power Grid - Ideal for outdoor use (where sunlight is present) ___________________________________________________________________________________ Solar Power Bank (w/battery): (Pros) Solar Power Bank (w/battery): (Cons) - Can charge high power devices anywhere - Conatains Lion Batteries (limited lifespan 1-2 years) - Doesn't need sunlight (internal battery) - Not Completely Eco-friendly - Takes a long time to charge internal battery Step 1: Tools & Materials. The USB charger circuit came from a cheap old iPod USB charger.
The main chip is similar to the well known MAXIM inverter chip. The circuit is a step-up/ step-down regulator, meaning when the power supply is underpowered it tends to boost the voltage but when the power supply is overpowered it limits the output voltage. It's ideal for solar powered purposes. Steps: 1st.) Dissemble a 12V High Power USB Charger. 2nd.) Cut the wires, short enough to be mounted on the solar panel.
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3rd.) Solder the charger circuit to the solar panel (Adding a switch is optional). 4th.) Use a hot glue gun to mount the charger to the solar panel. 5th.) Be sure that the USB port is not protruding and the circuit should not touch any other leads on the panel. Step 4: Adding the Foldable Stand (optional). ACAS, please remove or fix this instructable before someone fries their phone. I'm not sure why you thought to use a step UP USB circuit, but it really isn't a good idea. License Key For Screenflick. Scenario 1, the phone takes charge.
Unless a 10W panel is used, the phone is likely to use all the current it can suck from the circuit, the solar voltage will be loaded down by the step up regulator, probably to between 1 and 2 volts. Solar cells are effectively constant current devices, so instead of putting out ~4V and say 200mA, it will only give 1 or 2 volts at 200mA. That's wasting 3/4 to 1/2 of the directly connected power. Scenario 2, the phone isnt trying to charge. This is potentially dangerous for your phone, with no load on the charger output, the voltage WILL RISE TO THE OPEN CIRCUIT SOLAR VOLTAGE. A step up regulator does not have circuitry capable of reducing voltage. I measured my $1 6V 1W panel at 7V yesterday, not enough to damage the old phone I was playing with, but it refused to charge until I shaded the cell to bring the voltage down.
If someone used a 12v panel with your instructable, the phone could see over 20V! I'd only test that on a phone I was about to throw away. To do this properly (and cheaper!): 6v panel 5.1V zener diode of at least the wattage of the solar panel. USB charging cable. Cut off a charger or cut the supply end off a standard one.
The zener is connected ACROSS the panel, the striped end to positive. The USB cable is red to panel positive, black to panel negative. If using a cable cut from a wall charger, you're probably done! If there are green and white wires in the cable, connect them together but to nothing else.
Insulate them. Test that in bright sun and not connected to a phone, the panel voltage is about 5.1V. Up to 5.5V is within USB specs. If it all looks good, plug in to your phone and watch it charge!
I use the 'Ampere' app to check charging current. This is for androids. Apple stuff needs the green and white wires to have set voltages, a wall charger may have that circuitry in the phone plug end, though. Just have a question. I am working with my kids on a summer project to build one of these.