Here, I'll show you how I can use recyclable lawn / garden solar lamps to make a 12 volt power supply / charger.
I think I have about eight dollars. 00 So far!
Okay, let's get started.
I asked a recycling website if the used garden solar lamp worked.
After receiving the reply, I went to take about 15 from a very good person.
Some lights don't turn on about a second.
Mainly because of poor care.
The price/quality of these solar lamps is higher.
You will notice that each cell is inverted and that there is a switch that allows the LED to be turned on or off.
I'm sure it's for storage.
I put the lights off and turned them off.
For this project, you will not need a lamp, and the solar cells will continue to charge the batteries.
I found the box for this project at the Port Freight Company, about $5. -6 on sale.
Unfortunately, I did not take this part of the photo, because I did not intend to make this project a guiding project.
There is no light on the roof of these cells.
The metal shell forms a frame around the square element.
You will find that normally, cells are fixed to the bottom by a silicone sealant/adhesive.
An exacto or box knife cuts through part of it and carefully removes the cells.
Careful, sharp cutter, careful operation! ! ! ! ! !
I found that slowly and carefully, I could save every cell and my hand.
You can see how I placed all the batteries for welding.
The battery is in series/parallel configuration.
Therefore, in Essense, six batteries with batteries are connected to each other. -in a row.
Note that I have to place the sixth cell on each string at the top of the box so that it fits perfectly.
There are two rows and six cells, basically side by side. . .
These lines are connected at one end of the string + to + and-t -on the other.
It's like using big batteries.
If you look for U-shaped black line and red line bridges between units, you can see the series connection.
One row is black, the other is red.
In the last step, you see rechargeable A A batteries.
AA rechargeable battery has only one.
Charging time is 2 volts, not 1 volt.
5 is like a standard alkaline battery.
You will notice that there are all kinds of batteries in this array.
I have to use the battery I can find on time. It still works and keeps a certain amount of electricity.
So far it's good, but time will tell after a few charges.
So if you look at two batteries on each solar device.
You can say 2.
When charged, it generates a voltage of 4 volts. 2.
Four volts x six solar installations = 14. 4 volts.
This is sufficient voltage regulation and operates a 12 V DC project.
In most cases, not all 12 items can withstand up to 13 supply voltages.
8 volts, no damage.
The general rule of thumb is that if you can plug in a car cigarette lighter, you probably need 13. 8 volts.
In the box, you will see the blue surface of the cell.
This is a 1/2 inch carpet liner.
I need a way to prevent them from sliding around and from damaging the LED assembly if I want to use these lights for some purpose.
Under my filling layer（CLEAN)
Hand/dish towel folded.
I just need to add a little more thickness, but I don't need another 1/2 inch pad. The bingo game succeeded.
As you can see, DVM displays 14. 96 volts.
Most solar cells can generate enough electricity without a load to really shock you.
Once the load is adjusted or applied, the voltage will drop.
Cause voltage sag.
We still need a large enough voltage to charge the batteries below.
As a side note, when I tested the battery, I had a 13-watt energy-saving light bulb in my workspace.
Remember, we have two strings, each producing 14 strings. 96 volts DC.
When connected in parallel, instead of increasing the voltage, we doubled the current/ampere potential.
Therefore, when the load is applied, we should be able to see a smaller voltage sag.
Now let's close the lid!
Now put the lid on, and you'll see the charge voltage drop.
08 is not much.
Some opaque lids do filter out a little light.
I thought the difference would be much bigger than it really is.
Now we need to see a voltage drop of about 1 volt to achieve the normal charging voltage of 12 volt batteries. (13. 8 volts)
The output of most automotive alternators is about 13.
8 volts, use regulator to prevent overcharging.
I didn't draw it here, but there are two ways to help adjust the charger / power supply.
If you want to use this battery for power supply, such as a small CB/HAM radio, a radio that can withstand several amperes of current, I suggest you use one or two Zener diodes to lower the voltage.
When connected in series with the load, the voltage of most zener diodes will drop by about 1/2 to 1 volt.
You have to test it once, and then test it twice to find out what works for you.
I also recommend the use of load-compatible fuses.
For this package, I will use 1-
3 ampere fuse. If I can find it, it's probably 2 ampere.
As you know from the previous steps, I used a very cheap digital voltmeter.
A few years ago, I found me at a local amateur radio event for $6.
I also used size 18. （AWG)
American Wire Gauge Size Connector.
This wire is quite flexible.
The twisted wire is the best.
It's so easy to use, and it's unlikely to break into shape, and you'll need this type of project.
You can also see solder paste and thin solder paste.
About welding: Most people make mistakes, thinking that you only need Rosin / flux in solder to weld.
Sorry, you need to pull out your hair! ! ! ! ! ! ! ! ! ! ! ! !
If your solder surface is not clean/debris free, you will not be able to obtain good molecular bonds in solder joints.
If bare metal is not covered by flux during welding