I picked up two of these planels for a low powered solar project in short a solar hack. The price was right for what I needed. Testing the panels showed I was getting about 5.4 to 10.2 volts in full sun, and it was pulsed. You need a stedy voltage of 13.8 to 14.3 to charge a 12 volt Lead-acid battery for starters.
Opening up one of the panels I found that the flashing LED had been wired in series with the output cable NOT parallel like it should be, this is the cause of the low and pulsed voltages. I bypassed the LED leaving the blocking diode in place and now I'm getting 16.5 volts on a cloudy. This is what I need to start with.
Just because you have a flashing LED doesn't mean you have the proper voltage to charge or maintain even a small 2 amp-hour 12 volt battery like I am using.
Both panels I got were wired wrong inside from the maker so I expect it to be an issue with many of these panels. A good volt meter will tell you quickly if you are having the same issues I did. It looks like very poor quality control with their wiring. The solar panel seems to be well made.
You can't touch anything like this for the money anywhere else. I purchased it to add to my solar 12 volt battery storage but it's size, relative light weight, capacity, CCA, and...
If you have room and want to change over to the 6 volt golf cart batteries,you must make an important wiring change. Most rigs that have 2 or more12 volt batteries have them wired in parallel. when going to the 6 volters,you must wire pairs of them in series to produce the needed 12 volts. Thisis actually simpler than it sounds.... see the diagrams below.
Messing with batteries can be dangerous do so at your own risk and wear protection.
Part 1 converting the battery from acid to alum
Part 2 testing the battery again more extensively almost 6 months later
Started a drain over time test you can view the first 16 days results here
Final testing 3 months drain with no charge started truck 4 times including the last starting the truck in 10 degree F
1 cup or 8 oz of alum "aluminum sulfate" in a 1 gallon jug then fill the jug with water "it is best to use distilled water"
Same for the baking soda 1 cup per gallon. The baking soda mix is used after draining the acid to neutralize any left over acid. You can then after rinsing with that rinse with plain water to get out the baking soda mix. Then you will put in the alum mix filling to just above the plates and then charge.
My first attempt at taking a bad 12 volt battery in this case a deep cycle boat battery and replacing the acid with alum water " food grade aluminum sulfate" so that it will take a charge, worked so well I was able to start my truck with it after just charging it overnight with the alum water in it. Before replacing the acid in the battery it would not even hold 3 volts.
I used this food grade aluminum sulfate there are many other companies that sell it check your local grocers or feed mills as long as its food grade aluminum sulfate it should work fine.
12 volt battery
12 Volt Sealed Batteries
2 Volt Sealed Batteries
4 Volt Sealed Batteries
6 Volt Sealed Batteries
8 Volt Sealed Batteries
Silver Oxide Batteries
Energizer Jumpstarters and Inverters