How do I get photovoltaics to charge 12V batteries?

Question

_____Also 24V______

Answer 1

Battery chargers simply work by sending a higher current back through the battery than that coming out. A 12V battery requires about 13 to 14VDC to charge it.

A 24V would take 26 to 28VDC.

So, you need to set your photovoltaics up to get you this output, and then you can charge with it. The ampere rating is what will affect the time it takes to charge.

Answer 2

for a 12 volt battery you just need a solar panel that has a Voc (voltage of open circuit) of above 12 volts

if you use a DMM(meter) you can figure out if it is charging, and how fast

just hook positive to positive(red)
and negative to negative(black)

same thing for a 24v setup

if you add a diode it will keep the solar panel from draining the battery when it is not in sun

or get a charge controller, it will make it very effecient and are not expensive

have fun

Answer 3

i think you need photovoltaic solar panel. generally we use silicon as semiconductor in photo voltaic cells just check how much voltage is given by one cell( say 0.7volt) then divide 12 by 0.7 to get number of photo cells to get 12 volt battery. similarly for 24 volt.
but do take care of current as well. you need to see how many Milli Ampere or Ampere current you need accordingly connect photo cells in parallel too.