13-12-11, 09:42 AM
(12-12-11, 09:12 PM)limax2 link Wrote: If you linked the two 12v batteries together in series you would have the equivalent of a 24v battery as you say. However as I see it the draw from each battery would be 450ma. (I'm in disagreement with rustyrider here).Why? You've got 2 batteries connected together in series to give 24V and a load which is drawing 450mA. If you were to draw 450mA from each battery, you would have 900mA of current flowing. The lamp draws 450mA so where is the other 450mA going?
If you used a pair of 12V batteries in parallel, the draw at 12V would be 900mA, that would be 450mA per battery but by increasing the voltage you decrease the current required.