Advice needed 2 12v batteries in series to be charged by one panel

joncbrand
joncbrand Registered Users Posts: 2
in Off Grid Solar & Battery Systems #1
I have a 24v motor powering the winch on my boat lift. I have 2 group 24 marine deep cycle batteries 120 min reserve capacity that will be mounted on the lift near the motor. The motor draws 5A at full load and will run at most 10 min a day 3 times a week. Shore power is not an option. I have a 100w 12v panel from a dif project. I would like to charge both batteries with one panel. Is it possible/safe to use a single CC to charge both while still wired in series? Or am I over thinking and should just buy a 24v solar setup.
Jon
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  • Cariboocoot
    Cariboocoot Banned Posts: 17,615 ✭✭✭
    #2
    Re: Advice needed 2 12v batteries in series to be charged by one panel

    Welcome to the forum.

    You can't charge 24 Volts wort of battery from a 12 Volt panel. The Voltage simply isn't high enough. There's ways of boosting the Voltage but frankly it's not worth the expense compared to getting either a second 12 Volt panel like the one you've got or a 24 Volt panel (getting difficult to come by these days).
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  • joncbrand
    joncbrand Registered Users Posts: 2
    #3
    Re: Advice needed 2 12v batteries in series to be charged by one panel

    Im happy to be here ive been reading posts for months now. Im aware that a 12v panel wont charge a 24v bank. I was hoping somebody built a single CC that was capable/isolated to charge both batts separately while still wired in series . I guess ill pick up another 12v panel and controller.
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  • inetdog
    inetdog Solar Expert Posts: 3,123 ✭✭✭✭
    #4
    Re: Advice needed 2 12v batteries in series to be charged by one panel
    joncbrand wrote: »
    Im happy to be here ive been reading posts for months now. Im aware that a 12v panel wont charge a 24v bank. I was hoping somebody built a single CC that was capable/isolated to charge both batts separately while still wired in series . I guess ill pick up another 12v panel and controller.
    To charge two separate batteries while they are in series would require two separate isolated 12+V output circuits. And getting two separate outputs from one panel would require that one of the outputs be driven by an isolating DC to DC converter.
    That would cost as much as a separate panel and CC, since there is no real reason to produce one in high volume.
    SMA SB 3000, old BP panels.
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