Question about cell count

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David Huffman

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Jul 7, 2018
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i have about 200 cells 120 ncr3400 used and 100 Samsung 2000 used I want to build a 4s20p can I do that with these cells or do I need more cells.
 
DavidHuffman said:
i have about 200 cells 120 ncr3400 used and 100 Samsung 2000 used I want to build a 4s20p can I do that with these cells or do I need more cells.
Click to expand...

4s20p is only 80 cells so you are good there.Youcan, and it will work, but why 4s?

Its not the most compatiblevoltage. Somethingspecific you need it for?

You will probably have to buck most 12v gear if it can't handle the higher input voltage.
 
CrimpDaddy said:
DavidHuffman said:
i have about 200 cells 120 ncr3400 used and 100 Samsung 2000 used I want to build a 4s20p can I do that with these cells or do I need more cells.
Click to expand...

4s20p is only 80 cells so you are good there.Youcan, and it will work, but why 4s?

Its not the most compatiblevoltage. Somethingspecific you need it for?

You will probably have to buck most 12v gear if it can't handle the higher input voltage.
Click to expand...

The most effective way to power 12v devices of Li Ion batteries is to use a buck converter. Use a 6s or 7s pack, this will give you 25.2v or 29.4v (at full charge). There are many 24v to 12v converters that will accept these voltages, allowing an easy solution, that will give maximum run time off your pack. This however is if you must use 12v. Take a look at what Daygreen on AliExpress have to offer.
 
Agreed... That's how I have most of my stuff setup. 48 to 12 and 24 to 12.

Tha said, Victron makes a 12 inverter with a 17v inout voltage which makes it kinda cool.

Still, 4s lithium ion is generally speaking one of the least desirable builds.
 
CrimpDaddy said:
Agreed... That's how I have most of my stuff setup. 48 to 12 and 24 to 12.

Tha said, Victron makes a 12 inverter with a 17v inout voltage which makes it kinda cool.

Still, 4s lithium ion is generally speaking one of the least desirable builds.
Click to expand...

Well at least for heavy loads. 12v is not really suitable for high wattage, due the amps required. For example, a 1200w load @ 12v will be 100amps, where at 24v it will only be 50amps. High current means you need thick cable, and big breakers.
 
Geek said:
CrimpDaddy said:
Agreed... That's how I have most of my stuff setup. 48 to 12 and 24 to 12.

Tha said, Victron makes a 12 inverter with a 17v inout voltage which makes it kinda cool.

Still, 4s lithium ion is generally speaking one of the least desirable builds.
Click to expand...

Well at least for heavy loads. 12v is not really suitable for high wattage, due the amps required. For example, a 1200w load @ 12v will be 100amps, where at 24v it will only be 50amps. High current means you need thick cable, and big breakers.
Click to expand...

Sure... there comes a point where its also no longer feasible to even offer 12v hardware especially in high wattage applications, but my comments were more or less aiming at 3.7v nominal chemistry and how the usable voltage range generally does notmatchup with well withtypical 12v hardware. Many of my devices would experience and over-voltage condition with a fully charged4s pack.
 
Not sure how it got missed, but David went off OP topic/thread. Please create your own threads/questions and not hijack someone elses thread, please.
If you don't like the title, please do a "Full Edit" on the first post of the thread and you can change the title.
 
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