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Questions about 100AH build.
#31
Hello, I was wondering if you could give me your suggestion.
I have 6 packs of 24-18650 cells in parallel. The cells are 2k+each . And I want to build a power generator that can power 12 volt Accessories I also have a 12v 1000watt pure sine wave inverter. How can I connect all 6 packs together with a BMS to achieve the 12 volts. Thanks so much for your input. My goal is to achieve 100ahs at 12v.
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#32
In a way I'm not really sure what you are asking but I will give you my answer given the limited amount of info you have provided.

To achieve 100Ahs at ~12V with 2000mAh cells you would need 4s50p.
That is pushing those cells at their maximum C maybe but probably.
Are you just wanting 100Ahs of usable power to draw off of gradually?
At 1000 Watts at 12V thats ~84A so you are using ~1.84A per cell.
In that scenario the pack would last you a little longer than an hour.

I'm pretty sure my math is correct but feel free to correct me.

Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 8/7/2019
Total Number of Cells Recorded and processed                 6149
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2760
For Info Google Drive
Not your average Wolf       
            Cool
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#33
(01-25-2019, 04:52 AM)DCkiwi Wrote:
(01-25-2019, 04:38 AM)Redpacket Wrote: Reason I drew pic that way way I could not tell which way you rotated the pack.

if only you had reversed the wires to the charge controller ... lol.

No sure what you mean there?  The Victron unit has the battery + connection on the left, see their website info?
 

Yes the OP's drawing has it wrong still.
Running off solar, DIY & electronics fan :-)
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#34
Wolf: At 1000 Watts at 12V thats ~84A so you are using ~1840mAh per cell.

What does mAh have to do with the current drawn? Should be 1.8A per cell if you have 50 cells in parallel. But 12V as you calculated would be when the cells would have been empty at 4s since that is 3V.

4millvolts2: 12v is not easy to get going with LiIon since 3s is to low and 4s is to high. Would be better to chose something else like 24v or go with LifePo4.
Going 7s then you just use DC/DC to get 12v for the smaller appliances and use a 24VDC inverter instead.
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#35
(02-08-2019, 10:48 PM)daromer Wrote: Wolf: At 1000 Watts at 12V thats ~84A so you are using ~1840mAh per cell.

What does mAh have to do with the current drawn? Should be 1.8A per cell if you have 50 cells in parallel.  But 12V as you calculated would be when the cells would have been empty at 4s since that is 3V.

4millvolts2: 12v is not easy to get going with LiIon since 3s is to low and 4s is to high. Would be better to chose something else like 24v or go with LifePo4.
Going 7s then you just use DC/DC to get 12v for the smaller appliances and use a 24VDC inverter instead.

Uuups.
LOL I fixed it. I guess my keyboard got out of hand. Cool
Nice eye though makes it nice to know the nomenclature POLIZEI is watching.
I will be reading my posts twice before I hit the button for fear of getting the Daromer finger wagged at me and possibly fined and a ticket presented. Big Grin
Yes I do understand all that I was just trying to make a point as he was talking about 12V.
His quote  "My goal is to achieve 100ahs at 12v." 
But yes you are right 12V is one of those voltages that just don't go with 18650 packs. Ones not enough and one is too much.
Also I was getting all excited to pick up my monthly allotment of 200 packs.
That's all.

Wolf
If 18 X 650 = 2200+mAh then we have power! 
May all your Cells have an IR of 75mΩ or less Smile
Last count as of 8/7/2019
Total Number of Cells Recorded and processed                 6149
Total Cells required for PowIRwall                                   2856
Total Cells ≥2200mAh, ≥80%, ≥35mΩ, ≤75mΩ, ≥4.12V   2760
For Info Google Drive
Not your average Wolf       
            Cool
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