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Message: <blockquote data-quote="sweeney" data-source="post: 232406" data-attributes="member: 453"><p>Without knowing all the specs but since you have a controller on it, I am guessing it is over a 20 watt so if the solar charger is putting out its13.xx voltage and x amps and you put the small 12 volt battery in parallel with the big one it should charge, the different impedance of the batteries will probably cause a bit of a current difference to each battery however. I am not sure what the max current is for charging those small vex batteries, so this is where you might run into trouble, if you are charging at lets say 5 amps on that small battery. I know the chargers that usually come with them charge at a really low current. I would check into the specs of the vex battery and the solar charger. If you want do a small experiment and hook them up and take voltage and current readings just to make sure you are in spec and not going to ruin the small battery. If you aren't sure or don't want to mess with it like someone said get a small 12v inverter and just hook that to the 12v outlet or alligator clip it to the main deep cycle and use the 120v output to run the small factory charger. or have another solar charger with a smaller watt rating that will charge at a lower amperage, I have like a 8 watt solar charger I got for 5 bucks at menards that I would use it charged at .5 amps usually only used it to top off charge on my spare flasher or camera battery but it seemed to work decent enough during the day.</p></blockquote><p></p>

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