Can you charge a 24 volt battery with a 12 volt charger?

Answer 1

NOT UNLESS U CUT UP THE 24 INTO 2 12VOLT PACKS

You can also try this..

http://img.Photobucket.com/albums/v18/revwarnut/Batterychargingdiagram-2.jpg

i found the above drawing level of difficulty to be to much so i made my own via relays

note: use heavy duty relays for the normally open contacts depending on your load requirements i used lil ones for the normally closed contacts due to its a solar system and mine will only do about 5 amps max but size to your requirements and or voltages

here is my drawing or the circuit

http://img715.imageshack.us/img715/8809/12to24voltcharger.png