http://www.instructables.com/id/Solar-Powered-Mobile-Universal-Charging-Station/

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Solar Powered Mobile Universal Charging Stationby gfry on February 16, 2014

Table of Contents

Solar Powered Mobile Universal Charging Station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Intro:   Solar Powered Mobile Universal Charging Station . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Step 1:   List of Materials & Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Step 2:   Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Step 3:   Construction: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Step 4:   Construction Photos: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Step 5:   Its Alive...Its Alive! ...and some random closing thoughts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Step 6:   Closing Photos . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Related Instructables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

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http://www.instructables.com/id/Solar-Powered-Mobile-Universal-Charging-Station/

Intro:  Solar Powered Mobile Universal Charging StationA Brief Introduction:

My children are now in their teens, and as I have watched them grow I have also watched the complexity of their "toys" grow with them. My house is now full of wall wartsof every description charging everything from Wii remotes and cell phones, to notebook computers and flashlights...not to mention cordless tools :) No one ever unplugsthese charging devices so they silently keep adding to my electricity bill. This incessant drain of electricity has bothered me for a long time, not just from an environmentalperspective but from a monitary perspective as well. I once came across an article that suggested nearly 40% of our home Electricity bills are due to "phantom loads"such as wall warts and instant-on devices. This Instructable outlines my attempt at curbing some of the drain from phantom loads in my house.

Step 1: List of Materials & ToolsIn the spirit of cheapness which inspired this Instructable, I have tried to source most of the required parts by salvaging them from around my house, and borrowing themfrom other projects. In some cases I have noted where I originally purchased them.

Materials:

12 volt Automotive battery (later to be swapped out with 12 volt deep cycle batteries)Metal Rolling File Cart (I found this hanging around in my basement...I think it was originally purchased at Staples)200 watt, 12 volt inverter with Alligator clamps (I found this in the trunk of my wife's car...she'll never miss it. Philips)3 Automotive Solar Trickle chargers, 6 watts total ( I bought these in a clearance bin at Princess Auto a few years ago)Battery Post Terminals (Princess Auto $6.00)10 Gauge insulated solid wire (Had it kicking around in my shed)110V AC USB Charger (re-purposed from my blackberry playbook...it has a higher than average output current capacity)4 port USB hub (Not shown in this Instructable)Switched AC Power Bar (Hardware store $3.50)12"x16" Tray (Value Village, $2.99)Sheet metal ScrewsCable ties

Tools:

DrillMulti meterScrew DriversSoldering Iron & Solder

http://www.instructables.com/id/Solar-Powered-Mobile-Universal-Charging-Station/

Image Notes1. Battery terminal connectors2. Power Bar3. Inverter4. Heat Shrink Tubingfor the solder joints5. Tray from ValueVillage

Step 2: Wiring DiagramThe wiring for this project is very simple. The 3 solar chargers are hooked up in parallel with each other. I used a multi meter to determine the output polarities of thechargers. The chargers are then hooked up to the battery...positive to positive and negative to negative. There are diodes in the chargers to prevent the solar cells fromdrawing power from the battery when the sun is down.

I was going to use a switch to isolate the battery from the inverter, but at this point I simply disconnect one of the alligator clamps at the battery. When the system ischarging the battery, I don't want any draw from the Inverter.

I then plugged the AC power bar into the AC output of the Inverter to give myself five 110V AC outlets limited to 200 watts in total. Now, I can plug the wall warts into thepower bar and charge whatever I need to charge.

The inverter is internally fused so if the kids plug too many devices into the power bar, the inverter shuts down. My Lenovo notebook charger draws 90 watts, and myDewalt 18V battery charger draws roughly 50 watts. I try to keep the total power draw under 175 watts from all the devices hooked up to the system. There is also a lowvoltage alarm on the inverter when the battery drops below 12 volts.

http://www.instructables.com/id/Solar-Powered-Mobile-Universal-Charging-Station/

Image Notes1. 12 Volt, 800 AHCar Battery2. 200 Watt, 12 volt,Philips Inverter3. Car trickle Charger, 2 watts

Step 3: Construction:The File Folder Cart had to be slightly modified to strengthen it. I added a few sheet metal screws to the frame to stiffen it up so that the unit could withstand being rolledaround in my house.

I then drilled holes to screw the Solar Chargers to the file folder frame and screwed them into place.

Next, I wired the chargers in parallel and cable tied the wires to the metal frame of the cart. I used 10 gauge solid wire to connect the chargers to the battery terminals.The Inverter connects directly to the battery terminals with alligator clamps...paying attention to the polarity. If you reverse the polarity you will fry the Inverter. I cabletied the Inverter to the bottom shelf of the Cart to secure it.

The Power Bar simply plugs into the Inverter. I cable tied the wire for the power bar to the cart and and also tied the power bar itself to the tray to secure it.

http://www.instructables.com/id/Solar-Powered-Mobile-Universal-Charging-Station/

Step 4: Construction Photos:

Image Notes1. Solar Trickle Chargers2. Solar Trickle Chargers3. Rolling File Folder Cart

Image Notes1. Parallel Wired chargers2. Battery

Image Notes1. Positive alligator clamp

http://www.instructables.com/id/Solar-Powered-Mobile-Universal-Charging-Station/

Image Notes1. Heat Shrinking tocover the solder joints2. 10 gauge solid wire3. Terminal Posts with Wing nuts

2. Positive alligator clampfrom Inverter3. Negative alligator clampfrom Inverter4. Daughters ski helmet5. Positive From Solar Chargers6. Negative From SolarChargers

Image Notes1. Inverter2. battery3. battery4. Cable to Power Bar

Image Notes1. Tray2. Power Bar

http://www.instructables.com/id/Solar-Powered-Mobile-Universal-Charging-Station/

Step 5: Its Alive...Its Alive! ...and some random closing thoughts.I know many of you out there are probably scoffing at the 6 watt maximum output of the solar panels. Let me just say that this project is a start in the right direction. It maytake a few days to charge the battery but it takes a few to drain it as well...and all that energy is free! I roll the unit out on my front porch to charge it. I just leave it in thesun all day and it does its thing. The kids think its cool and they are actually using it which is something I hadn't expected. Its also great in a black out. We hook up acouple LED lights to it...who needs candles anymore. Regardless, the little "power cart" gets rolled around our house charging whatever it can.

I am looking for a 20 watt solar panel to replace the little trickle chargers but they are hard to find on a zero budget. Installing that will also require a chargecontroller...something else that will require some time to find on the cheap...or I could make one...hmmmmm.

The car battery was just an extra that I had kicking around in my shed. This spring I intend to visit a Boat Marina or two and dig up a couple of deep cycle batteries. Thespring is a good time to get discarded batteries that still have tons of life left in them. A deep cycle battery would certainly be better suited to this application.

Most small Inverters that I have used draw power even when the switch is turned off. It is important to disconnect the battery from the rest of the system when it is not inuse...the Inverter will kill the battery even if it is turned off. I will likely install a SPDT switch between the battery and the inverter.

Step 6: Closing PhotosAlthough I have been a member of Instructables for many years, this is the first Instructable I have ever written. I am entered in the Portable Workstation Contest so if this'ibble has inspired you to build something similar or if you found it worthwhile reading, please vote for me.

Cheers

Gord

Image Notes1. Playbook2. This Tray is actually Teak...Value Village Find :)

http://www.instructables.com/id/Solar-Powered-Mobile-Universal-Charging-Station/

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Comments

4 comments Add Comment

 lqdtrance says:  Feb 18, 2014. 5:39 AM  REPLYPersonally I would have put the solar panels on top with hinges for better positioning. Maybe add a tray or two and/or build a side where your existing panelsare and put in wall outlets and direct USB ports etc...Good start though. I bet it saves a bunch of money actually.

 gfry says:  Feb 19, 2014. 5:06 AM  REPLYI tried to keep the unit compact enough to wheel it around easily. I hear you on the power bar and USB ports on the side...that would give more room onthe upper tray.

I'm not sure how much money it saves yet...I'm just happy its getting used :)

 djb439097 says:  Feb 18, 2014. 9:56 PM  REPLYJust out of curiosity, where did you get the super Sat Buddy? Do you work for a satellite company?

 gfry says:  Feb 19, 2014. 4:55 AM  REPLYYes...I'm a sat technician