Trouble with homemade Solar Charger for AA AAA Batteries. Parallel issue?
I had bought 3 cells online for just under $4. Each one generates approximately 2.3Volts at 150Mah. Together in parallel they should generate about 450Mah in full sunlight, correct? Well, I had already tested them and they did work fine, I gave a small charge to a single double AA and success.
I put it all together with the cells, wires and battery compartments and the one way diode. (Use photograph for reference)
Once complete, I had put 2 AAA batteries in. Put together they only require 400mah total to charge or just less then an hour.
But when I took them out, they didn't take a charge at all....if anything they drained right dead. I thought maybe the diode was backwards but that wasn't the case either.
Finally I took a multimeter to it and although it was getting over 2 volts easily, the amps were only showing 60Mah total. Not even half of what one of the cells are capable of. I did have it in full sun too, so there must be something whacky wrong with my wiring. Can anyone spot a possibility of a mistake or do I just have bad luck? I have worked with full size solar panels (100watts worth) and never had an issue like this before.
Any ideas? Thanks!
P.S. Is it possible that the positive and negative have to come out of the same cell? I am not sure if this matters since this is in parallel. I don't have a lot of time on my hands lately and I was hoping to get an opinion before changing something unnecessary. Thanks again!