I have worked with "sealed Gel Batteries" for 20+ years. If you open the top around the seam you will find that they do vent! There are little rubber cups over the small holes and a place for them to vent! When they dry out sometimes you can add water and bring them back

For anyone intrested. They now do a EPsolar Viewstar VS1024BN, with voltages which can configured "custom". Haven't tested it but should allow for a 12v battery combination.

Winter solstice greetings Adam...!   First, thank You for all your videos and work... googling this series for the second or third time.   Very inspirational...!   Started experimenting (again) with solar and batteries.If you have lamps as load, you can couple same types, 2 in series = Voltage divider. Saves on the buck load.   The 12/24V setup seems logical, for small projects and lead/18650.  It is a good idea, to separate 12 and 24 V systems with different plug/connectors ...just like we have a different plug for mains and rc.

its good they are people on youtube, that have knowledge and know what they do

Great shit man!
You are saving a bunch of people from having to do this experiment.
I had already done all this in my head, so I look forward to the results.

Thanks for the reply appreciate it cheers Shane

this is an awesome project i been wondering abot using my lead acid solar charger to charge 18650 thank you for that

You are great at presenting your experimentation ideas and reasoning behind them. Seems like a great test to me. There are some (really smart and experienced with lithium) folks on the solar panel talk forum who think charging with a pwm is fine - with some of the caveats that you considered. Looking forward to the results.

Great job !

Excellent, thank you

Hey Adam

First of all I’ve got to say ; great videos ! They are a pleasure to watch, regarding your clear explanations, excellent video and sound quality, your expert level (as far as I can say), your scientific approach and last but not least your independancy !!

I was hoping you could help me out a little bit on my décisions on how to assemble my litium-ion 18650 battery pack out of USED ones, which I already tested with the ZB2L3 modules.

All this to run :

- a 800 W Pump, peak  times 3 makes 2400 W
- some phone/camera/notebook chargers 200W
- led lights 200W
- 2 fans of 100 W : 200 W
 
total power need of approxiately :

  Nominal :  1400W ;

  Peak :  3000W ;


Respecting the adjustment of the total capacity per parallel ‘layers’, what if I used different cell quantities in parallel ?

Simplified example :  1st  serie   5 mAh + 5 mAh + 5 mAh + 5 mAh + 5 mAh    = 25 mAh
                   2nd serie   6 mAh + 7 mAh + 6 mAh + 6 mAh      = 25 mAh    
                                               3rd  serie  8 mAh + 8 mAh + 9 mAh                      = 25 mAh
                   4th  serie  12 mAh + 13 mAh                       = 25 mAh
                   5th  serie  4 mAh + 4 mAh + 4 mAh + 4 mAh + 4 mAh + 5 mAh          = 25 mAh    
                                               6th  serie  3 mAh + 3 mAh + 3 mAh + 3 mAh + 3 mAh + 3 mAh + 3 mAh + 4 mAh = 25 mAh

I figure that if I’d compose my pack like this, the cells are unevenly applied to when charging or discharging, so, as long as I make sure that I have enough of ‘m in parallel (so NOT like the 4th serie in the example), I ‘d eliminate the chance of extracting to many Amps at once out of a single few of them, resulting in overheating and or damage.

Considering my needs, could I determine the size of my battery according to a maximum Amperage demand of 2C per cell?

 Let’s say, in a 24 V battery system,according to my needs, I’d need a maximum peak      amparage capacity of 125 Amps (3000W devided by 24V). Every single one of the 6 series needs to be able to  supply 125 Amps. If 2C  equals 125 Amps, Then, C equals 67.5, lets round that up to 68 Amps. Considering that my  first question would not be discouraged, one series could consist of 34 cells of 2000 mAh, a second layer  could for example consist of 68 1000 mAh cells…, a third of 46 cells of 1500 mAH and so forth……

In total, this would come to a 24 V, 68 Ah battery pack of 1.6 kW…

As it comes to solar charging, what affordable solar charger could you advise, according to my needs ?
As it comes to converting to 220V AC, what affordable converter could you advise, according to my needs ?
Do you recommend to reduce the ampérages by assembling a 48 V Battery ?

Thanx in advance

Nice I will look forward to the follow up video. I have been thinking about doing something like this. Cheers.

Great video.. Many thanks..!

Very educational video on n interesting subject. Thank you bro

Thanks this was rely helpful

Good explanation.  very useful .

This is ons of the best tutorial videos on 18650 hats off to you.

Well reasoned.

Great vlogs.... think it’s funny how you point at everting 😂😂

Just watched all the the videos in this series they are brilliant just what I’ve been looking for