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3s or 4s 12v Lithium Ion Battery  

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nicace
(@nicace)
Street cred = 10 mAh Customer
Joined:1 month  ago
Posts: 2
08/11/2018 9:11 pm  

I plan on using a 12v Lithium ion battery to power different 12v electronics in my van such as a pump, fan, and (via an inverter) some computers and maybe a blender or some other kitchen supplies that aren't super Watt intensive. 

I'm wondering if a 3s 12v batter with 11.1 nominal voltage (that drops down to <9v) would be fine to power 12v electronics or if I need a voltage booster/regulator. Or would a 4s(14.8 nominal voltage) battery be better? With perhaps a voltage step down?

I also noticed that the BMS you have is only 25 amps so if I wanted to use a 600 Watt blender I would need 2 BMS/Battery setups connected in parrallel, correct?


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garolittle
(@garolittle)
Street cred = 500 mAh
Joined:1 year  ago
Posts: 70
16/11/2018 8:51 pm  

I recommend the 4S setup so you stay above 12v most of the time.  However, you may need a pure sine inverter since your voltage can be as high as 16.8V. I have regular inverter for the Battery Pack below but it only works below 15.5 volts. 


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garolittle
(@garolittle)
Street cred = 500 mAh
Joined:1 year  ago
Posts: 70
16/11/2018 8:55 pm  

Sorry. Attached picture below. 


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nicace
(@nicace)
Street cred = 10 mAh Customer
Joined:1 month  ago
Posts: 2
18/11/2018 6:31 pm  

The one thing I'm worried about with the 4s setup is charging it via the alternator and solar panels will require a higher voltage setup or boost inverter.

I've also thought about using a 24v setup. I know I can use a combination of boost/buck inverters for any of these setups but also trying not to be inefficient with converting voltages. 

Any experience with inverters? I'm hoping to use less than 60 amps at a time but I've found it hard to find inverters in that range.

 

 

 


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GYCL
 GYCL
(@gycl)
New Member
Joined:2 weeks  ago
Posts: 1
27/11/2018 9:08 pm  

I’m thinking to build a 12v pack as 4s30p with total 120 3.7v 18650 cells, any recommendations for the configuration ?

or two 12v packs as 4s15p then I have the choice to series or parallel for 12v or 24v. Please give me some advices ! Many thanks 😊


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junichi
(@junichi)
Street cred = 10 mAh
Joined:4 days  ago
Posts: 2
10/12/2018 8:22 am  

I had the same question for a sub battery of my car. The sub battery is used to make the dashcam run 24H at the parking mode. Since the sub battery must be charged by the car alternator 14.5V, I would choose 3s. I may put DC/DC up converter for the dashcam, if it is really needed. 


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junichi
(@junichi)
Street cred = 10 mAh
Joined:4 days  ago
Posts: 2
11/12/2018 8:51 am  

The charging voltage for 3s cells is 12.6v. I may need to insert DC/DC down converter between the car alternator and the sub battery.


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