solar panels have a wide range and you can procurement than with 4.5V-220mA, 12V-100mA , .5V-20mA.... also you can with connect cell in Series or parallel status TO increment output voltage and current . PLS goto some salesroom and buy a useful cell .
What about the circuitry of the charger required to charge the batteries ?
it's dependent to kind of battery . if you use NI-CD battery , for charge that , you need steady current ambit 1/10 nominal battery current and increment voltage for 10 hour . (in start , battery need a large current and you need decrement voltage to steady that , with expire time current has been slake AND you need increment voltage for come that to 1/10 nominal battery current )... .
Do solar panels required any routine (or daily) maintenance Or any preventive maintenance ?
Do they have to save from rain or water or moisture ?