I have a 24V battery (two 12V lead/acid in series) connected to solar panels and I'm looking for a way to have a 12V battery and circuit. (But the solar array will charge the 24V system so i need the 12V battery to be charged with power from the 24V)

I bought :
- A 12V battery
- A Step-down 24V to 12V converter 30 Amps

Can I simply connect the 24V to 12V converter to the 24V battery and connect just after it the 12V battery? Or do I need something else, like a battery charge controller?

  • \$\begingroup\$ How does your step down converter feel about having a battery connected to its output? \$\endgroup\$
    – winny
    Commented Jan 13, 2020 at 23:04
  • \$\begingroup\$ If 12V is what you need, why can't you use the step down converter directly, without the 12V battery? \$\endgroup\$
    – Dampmaskin
    Commented Jan 13, 2020 at 23:08
  • \$\begingroup\$ @winny that's part of what my question is about, do they have a current backward protection or something else ? \$\endgroup\$
    – bob dylan
    Commented Jan 13, 2020 at 23:10
  • \$\begingroup\$ @Dampmaskin Well at some point i might have to recharge this 12V battery with another system. (maybe wind power). Furthermore, i would like to have an inverter that could use more than 30A. (12v) \$\endgroup\$
    – bob dylan
    Commented Jan 13, 2020 at 23:12
  • \$\begingroup\$ Please make your question clear. What is the output of your solar panel? If its output is 12V (as usual), then you need to change the battery's connection to become parallel (double the current capacity but lower voltage with power will remain same as P=V*I). If its output is 24V, then your connection is correct, you then just need to connect the panel output to the battery. So, make your question firs clear. Make schematic, so you will get the right answer. \$\endgroup\$ Commented Jan 14, 2020 at 2:04


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