12V Batteries Combined in SERIES - Different Size/Capacity OK?

[hucklongfin]

this is what im not understanding. can anyone explain this?

They're 12 volt batteries connected in series to get 24 volts.

 

[kindafishy]

They're 12 volt batteries connected in series to get 24 volts.

yes i understand that, im wondering how you charge a 24v bank with a 12v charger?

 

[hucklongfin]

You don't charge a 24v bank you charge 2 12v batteries. I have a 4 bank charger hooked up to all 4 of my batteries. Two are hooked up in parallel via a switch and 2 in series for the trolling motor.

 

[MYNomad]

You don't charge a 24v bank you charge 2 12v batteries. I have a 4 bank charger hooked up to all 4 of my batteries. Two are hooked up in parallel via a switch and 2 in series for the trolling motor.

And the grounds of the charger circuits are not common grounds. If they were, it would create a dead short, but they are not. A 24 volt charger could work, but if the batteries are not identical, one will be limiting the other, perhaps severely.

 

[karlow]

Like I said, or Rick said. As for the multi-battery 12V charger, it will work if the chargers have are independent, ie isolated circuits. The first test is to measure for continuity between the ground leads. there should be none. You can solve the problem by unloading that puny GP27 on me at cost. That way you can sleep well. I currently need 2 GP 27 4 my Outrage Project. FYI I typically get them at Costco.

 

[kindafishy]

Like I said, or Rick said. As for the multi-battery 12V charger, it will work if the chargers have are independent, ie isolated circuits. The first test is to measure for continuity between the ground leads. there should be none. You can solve the problem by unloading that puny GP27 on me at cost. That way you can sleep well. I currently need 2 GP 27 4 my Outrage Project. FYI I typically get them at Costco.

ok thank you. for whatever reason i get it now. so no continuity between charging circuits with in the charger. thanks!

 

[rowdyrosco]

optima are shit for boats

 

[RobertHan]

It’s a wonderful idea to add a secondary battery to your boat. Doing so will increase the power of your vessel to its optimal performance. Instead of having only one battery, you will now have the power of two and be able to go on longer boating activities.

 

[dwaynesda]

Interstate Batteries are great. If you are in San Diego, go to the Interstate warehouse store off Arjon in the Miramar area.

This is what you are looking for: SRM 31. More reserve power available in a larger battery.

https://www.interstatebatteries.com/products/srm-31