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So I have a 12 V solar system (panels produce 20 V but batteries are 12 V. I also have a set of 5 batteries. One of these batteries is a marine deep cycle battery and the other is a group of five lead calcium batteries.

I read a lot about how PbCa batteries are Lead-Acid, so is it okay to connect these two dissimilar batteries in parallel to maximize usage?

What are the advantages and disadvantages of doing so?

  • Solar charge rate: 7 A max
  • Solar charge voltage: 20 V max OC
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  • \$\begingroup\$ Most probably yes. Peak charge voltage may differ ever so slightly. Check the datasheets for each. What's your present voltage regulation setpoint? \$\endgroup\$
    – winny
    Nov 27 '20 at 13:11
  • \$\begingroup\$ I think its 15v for sealed PbAcid, 14.4 for flooded PbAcid. some other value for gel batteries. \$\endgroup\$ Nov 27 '20 at 17:41
  • \$\begingroup\$ 15 V is seriously high. You will boil the water away. \$\endgroup\$
    – winny
    Nov 27 '20 at 21:04
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After doing some deep research, I've answered my own question.

enter image description here Thanks to this guy

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  • \$\begingroup\$ Seems like a bit of cherry picking the information. Last para It is for these reasons that you are advised to use batteries of the same brand, voltage and capacity. Failing to do so (if you don’t have the knowledge and tools to check what you are doing) could create a potentially dangerous circuit. \$\endgroup\$ Jun 27 at 21:11

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