Hi,
I've been searching forums for the past hour but can't find the answer to this...
I have a small solar panel that in bright noon sun provides 8.5 volts and about 250 mA's. I'm trying to make it charge AA batteries. I originally tried 6 Energizer 2400 mah batteries in series from the panel, but with the diode from the panel, it dropped my voltage down to a little over 7 volts and I guess this wasn't enough for the batteries so they never really charged.
Now I'm trying to use a 5v 1amp voltage regulator to charge 4 AA batteries in series. I was thinking this would work since each battery is 1.25 volts, but it's acting the same way and they never quite reach 5 volts. I know that AC chargers charge each battery a lot higher than 1.25 volts, but I'm not sure if that's necessary.
My question now is, should I just use the high voltage straight from my solar panel (~7.5 volts with the diode), to charge 4 AA batteries? Will this work? If so, I guess I'd need to watch my time closely to prevent overcharging? And at would voltage on these AA's would be dangerous to charge to?
Thanks so much for any advice and help,
Brandon
I've been searching forums for the past hour but can't find the answer to this...
I have a small solar panel that in bright noon sun provides 8.5 volts and about 250 mA's. I'm trying to make it charge AA batteries. I originally tried 6 Energizer 2400 mah batteries in series from the panel, but with the diode from the panel, it dropped my voltage down to a little over 7 volts and I guess this wasn't enough for the batteries so they never really charged.
Now I'm trying to use a 5v 1amp voltage regulator to charge 4 AA batteries in series. I was thinking this would work since each battery is 1.25 volts, but it's acting the same way and they never quite reach 5 volts. I know that AC chargers charge each battery a lot higher than 1.25 volts, but I'm not sure if that's necessary.
My question now is, should I just use the high voltage straight from my solar panel (~7.5 volts with the diode), to charge 4 AA batteries? Will this work? If so, I guess I'd need to watch my time closely to prevent overcharging? And at would voltage on these AA's would be dangerous to charge to?
Thanks so much for any advice and help,
Brandon