Newbie here. I have a basic understanding of electronics, probably just enough to get me in trouble. I'm playing with making a battery charger with a 9v, 1.5W, 167mA solar panel I found on clearance at radio shack. I've watched numerous videos and read numerous articles on making one, but need some expert advice.
Today I hooked up my panel straight to a 4aa battery pack w/ 1.2v 2500 mA rechargeable batteries with only a 1n914 diode in series on the positive. My voltage output from the panel disconnected is 9v but as soon as I connect it to my battery pack it drops to 5.5. Is that too much for my battery 4.8 combined voltage requirement??
I know that to avoid battery damage I shouldn't pump more than 10% (250mA) of the battery capacity in current. Under a bright sun I was only getting approx 80mA with my batteries connected. So I'm thinking I should be safe adding another solar panel to push up to 160mA???
My original goal was to make a solar battery charger that I could then use to charge my cell phone via usb cable. I was looking at getting a lm317t voltage regulator chip to drop the voltage and stripping a car usb car charger to use for my output once the batteries are charged. Now after looking at my voltages and current the lm317t doesn't seem necessary??
Thanks in advance. Remember, newbie - I won't understand a really technical engineereze response.
Today I hooked up my panel straight to a 4aa battery pack w/ 1.2v 2500 mA rechargeable batteries with only a 1n914 diode in series on the positive. My voltage output from the panel disconnected is 9v but as soon as I connect it to my battery pack it drops to 5.5. Is that too much for my battery 4.8 combined voltage requirement??
I know that to avoid battery damage I shouldn't pump more than 10% (250mA) of the battery capacity in current. Under a bright sun I was only getting approx 80mA with my batteries connected. So I'm thinking I should be safe adding another solar panel to push up to 160mA???
My original goal was to make a solar battery charger that I could then use to charge my cell phone via usb cable. I was looking at getting a lm317t voltage regulator chip to drop the voltage and stripping a car usb car charger to use for my output once the batteries are charged. Now after looking at my voltages and current the lm317t doesn't seem necessary??
Thanks in advance. Remember, newbie - I won't understand a really technical engineereze response.