38120 vs prismatic 3.2 bank

[lanman31337 10+ year member]

Is there a reason to avoid the prismatic banks, such as https://www.dhgate.com/product/orig...urce_id=554382979#s2-28-1;searl|1325319652:30 - I'm going to be running 6000+ watts plus a mids/highs amp and I have a 300 amp alternator. Would a bank of 4 be ok for what I need?

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[hispls 5,000+ posts]

Is there a reason to avoid the prismatic banks, such as https://www.dhgate.com/product/orig...urce_id=554382979#s2-28-1;searl|1325319652:30 - I'm going to be running 6000+ watts plus a mids/highs amp and I have a 300 amp alternator. Would a bank of 4 be ok for what I need?

IF you wanted to attempt to run those batteries you would need 5s6p to safely run a 6000W amp. And that's assuming they're good batteries with accurate published specs. So you're already up to 2400$ price tag. Now what did you intend to do for busing up this bank?

 

[Popwarhomie 5,000+ posts]

Not a good cell for car audio. Seen a few people use them at 24 volts for trolling motors. They have a low discharge.

 

[lanman31337 10+ year member]

Did some digging, those are only a 1C discharge for the prismatic cells. That's not going to be good for audio. The 38120HP seem to be where it's at with the 15C discharge and 10AH per cell. I'll build a few banks of those. Thanks everyone.

 

[Popwarhomie 5,000+ posts]

You will want to use the 38120 8ah cells for car audio. 10ahs have a lower discharge.

 

[lanman31337 10+ year member]

Good call. I saw that there's two flavors, maybe more. Most of the non-hp are only a 3c discharge.

 

[hispls 5,000+ posts]

Did some digging, those are only a 1C discharge for the prismatic cells. That's not going to be good for audio. The 38120HP seem to be where it's at with the 15C discharge and 10AH per cell. I'll build a few banks of those. Thanks everyone.

Why not get into some lithium titanate cells? Pretty much all of them are 10C or greater charge and discharge and they have about 10X the life expectency of LiFePO.

 

[lanman31337 10+ year member]

I would just need two banks of 6, bms, and adjustable regulator to get me 15 volts charging?

 

[hispls 5,000+ posts]

I would just need two banks of 6, bms, and adjustable regulator to get me 15 volts charging?

You don't need to charge them to 15V for them to be effective. If you're worried about balancing or whatever you'll have to do that either way.

 

[lanman31337 10+ year member]

Thank you sir. Appreciate your time and info. Very new to Lithium.