I have finally figured out how to make a solar panel that will last!!!
Now I have a few questions about the wiring, I have currently been building my panels w/38 cells for a 12 volt system putting me around 18 or 19 volts out put and round 3.5 amps. 3x6 cells
My question is regarding a 24 volts system… I have 2 sets of breakers in my house 1st is a 120 volts, which will be handled by the 12volts system and the 240 volts switches, which is where the 24 volts system comes in. My question is How should I wire the solar panels for the 24 volts system.. Should I ..
A.) continue to make 18,19 volt panels and wire them together in series or,
B.) make a complete panel out of 76 cells and come down at 38 volts??
What I’m thinking is:
I think that by wiring 2 panels together in series I’ll lose a lot of wattage vs just wiring the whole panel for 32 volts in from the start..
Example 1: 38 cells @ 1.5 watts =57 watts, @0.5 volts = 19 volts = if I wire 2 of those in series I have 38 volts but I’m still at 57 watts, losing the other 57 watts from the other panel.
Example 2: 76 cells @1.5 watts= 114 watts @0.5 volts = 38volts, don’t have to wire in series because I already have needed voltage.
So am I correct in thinking that I need to use example 2 when designing my solar panels for 24 volt system???
Now to the Good part, HOW TO MAKE A SOLAR PANEL THAT WILL LAST
1st step, tab the front of all solar cells
2nd step, go buy your encapsulating product, I found a cheap over the counter product that doesn’t seem to yellow that much, I’ve had my panel out in the elements for a month now and still no yellowing… this is the product I’m using: http://www.biosafe-inc.com/glazecoat.htm (you can get this product from Lowes or Home depot for $22.00, it’s rated for indoor use, I’m in Atlanta GA and it’s been extremely hot and I’ve had no problems out of it, and it doesn’t yellow)
3rd step-PRIME the front of your solar cell, basically mix a small batch of Epoxy and paint it on the front of the solar cell (make sure paint brush strokes are in the same direction of the tabbing wire, don’t paint the epoxy on the front of it going against the tabbing wire, you might lift it up or break a soldered boned) After putting the epoxy on the front of the solar cell, put it on the glass face down where you want it to go. Do this for all the cells you plan to put in the panel, make sure you put the cells where you want them because once the Epoxy hardens it’s on there for good. (Wait a day for the epoxy to harden then go to step 4)
4th step- Solder the back of the solar cells together linking them in series. And wire all your bus bars, the cells are not moving while you work
5th step- Now that all the cells are linked together, out line the entire piece of glass with silicone. (What your trying to do is keep the Epoxy from drain off the glass onto your work area)
6th step – Mix more Epoxy and pour it all over the cells, don’t worry about bubbles, you fixed that problem when you painted the epoxy on the front of the cells in step 3 , like I said before I use this stuff. http://www.biosafe-inc.com/glazecoat.htm (wait a day for it to harden)
7th step- After it hardens, you’re pretty much done, get your miter saw and 2 L channels aluminum trim and cut your frame, actually, I do this step first; I mount my L channels to the glass to help keep the epoxy from spilling.
Now you have a long lasting solar panel.