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Connecting two battery banks in parallel

john_mont

New Member
Joined
Feb 11, 2024
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10
Location
Mobile, Alabama
I have 16 group 31 Power Queen 12.8v 100ah Lipo4 batteries connected in 4S/P to create a 400 ah 48v battery bank. Can I connect the two banks in parallel to make 800ah?
 
I have 16 group 31 Power Queen 12.8v 100ah Lipo4 batteries connected in 4S/P to create a 400 ah 48v battery bank. Can I connect the two banks in parallel to make 800ah?
So 4 stings of 4? 4S4P?

That’s only 400ah at 48v,

Are you proposing adding a second 4s4p, so equivalent to 4s8p?

Make sure you have proper over current protection per string.
 
Doh! I interpreted it as adding a second bank.

@john_mont , if you are asking if you can wire the 16 100Ah batteries you have in a different way to get 800Ah, I must change my answer to no.

4S4P 100Ah 12.8V for 51.2V is only 400Ah.

If you would like to add a second 4S4P group to your bank, that would be 800Ah.
 
Doh! I interpreted it as adding a second bank.

@john_mont , if you are asking if you can wire the 16 100Ah batteries you have in a different way to get 800Ah, I must change my answer to no.

4S4P 100Ah 12.8V for 51.2V is only 400Ah.

If you would like to add a second 4S4P group to your bank, that would be 800Ah.
thank you for your information.
 
Prices on 48v batteries on Amazon have come down quite a bit. You might be better off just buying some actual 48v batteries. It might even be cheaper when you figure all the cabling and balancers for 4s 12v strings. You can parallel some native 48v batteries into your existing strings the same as you would a new string of 4s 12v batteries.
 
Prices on 48v batteries on Amazon have come down quite a bit. You might be better off just buying some actual 48v batteries. It might even be cheaper when you figure all the cabling and balancers for 4s 12v strings. You can parallel some native 48v batteries into your existing strings the same as you would a new string of 4s 12v batteries.
Thanks for the info.
 
So 4 stings of 4? 4S4P?

That’s only 400ah at 48v,

Are you proposing adding a second 4s4p, so equivalent to 4s8p?

Make sure you have proper over current protection per string.
I contacted Power Queen the manufacturer of the batteries and they said that the max is 4S/4P. Thanks again.
 
Prices on 48v batteries on Amazon have come down quite a bit. You might be better off just buying some actual 48v batteries. It might even be cheaper when you figure all the cabling and balancers for 4s 12v strings. You can parallel some native 48v batteries into your existing strings the same as you would a new string of 4s 12v batteries.
I will start looking to 48V batteries I looked on Amazon and di find a lot of great prices. thanks again.
 

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