Originally Posted by Ibedayank
for solar panels to work they have to be in DIRECT sunlight volts x amps = watts
to charge a battery you have to produce more volts then the battery can put out
Mine( HF chargers) work pretty good even in not so direct sunlight, the red light starts blinking, indicating charging. They just need direct sinlight for MAX output. I use them on equipment that don't run much. Even in not perfect sunlight, they will cook large batteres if left hooked up continuosly without monitoring voltage.