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PowerJack 30000Watt 48volt LF SP PSW 2 box inverter 2021 model 189 pounds

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(@dickson)
Noble Member
Joined: 4 years ago
Posts: 1058
 

I guess people are moving away from lithium ion batteries because  LiFePo4  batteries don't combust so easy.   

IF your  LiFePo4 batteries is  24v  or 48v  string  then it is safe .      Sandi is testing  800v DC inverter  which mean 150 LiFePo4  cells connected in series  .     It is almost impossible for DIY  to have every connection tight and if one  connection is loose then the arcing  will  destroy  30000 dollars of    LiFePo4  batteries  like what happen on a youtube video .         My lithium ion battery in in concrete box  outside  and the connection  do  get loose by the heat and current  surge  and  I shut off the inverter and the measured  temperature was  350 degree F   and the battery  will blow up at 400 degree F.     


   
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(@dickson)
Noble Member
Joined: 4 years ago
Posts: 1058
 

I guess people are moving away from lithium ion batteries           My  battery are lithium-ion and dangerous .  

 


   
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(@robertm)
Estimable Member
Joined: 3 years ago
Posts: 205
 

I have a used 52W 11AH ebike battery I keep on a metal shelf in my shed. It doesn't self -discharge, so the cells are probably good. Some people will check Li-Ion batteries for heat.

I also have a metal can out there with some old 18650 Li-ion cells from laptop batteries. Only 3 cells are first rate, and the rest are low grade. I want to build a 12V battery from the low grade cells just to practice soldering nickel strips as bus bars. Later, I will have enough first rate cells to build a 4P3S battery with a bms.


   
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(@sid-genetry-solar)
Member Admin
Joined: 4 years ago
Posts: 2890
 
Posted by: @robertm
I also have a metal can out there with some old 18650 Li-ion cells from laptop batteries.

I do NOT recommend using these.  Personal experience: it's not worth the risk. 

Had one that had full charge capacity (2.2Ah)...up to 4.1v.  If you took it to 4.2v, it'd get extremely hot.

Others would develop internal slow-shorts.  Not enough to generate significant heat--but enough to significantly imbalance the pack.  And of course, not enough to blow a cell fuse.

 

Posted by: @robertm
and the rest are low grade. I want to build a 12V battery from the low grade cells

Don't do it...unless you fancy rebuilding your garage.

 


   
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(@robertm)
Estimable Member
Joined: 3 years ago
Posts: 205
 

I've culled out the really bad cells that heat up. The low grade cells that are left (they charge ok, but self discharge too quickly) are just for soldering practice. I want to link at least 3 in parallel. I may even try to build a crude spot welder. Once I do it, I'll recycle them. I will save the few first-rate cells that I find, and eventually try to build a Li-ion battery with a bms and cell balancing.

I don't keep any lithium cells in the house or garage.


   
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(@sid-genetry-solar)
Member Admin
Joined: 4 years ago
Posts: 2890
 
26 minutes ago, RobertM said:

The low grade cells that are left (they charge ok, but self discharge too quickly) are just for soldering practice.

We actually had a pack of precisely that kind of cells start a fire during charge.  Wasn't pretty.

 

26 minutes ago, RobertM said:

I've culled out the really bad cells that heat up.

"Decent" cells can/will eventually turn into "heaters" as they degrade.  Which is why I cringe when I see "powerwalls" with thousands of "recovered" laptop batteries in them...there is no way you will ever be able to catch a "new heater" 2 years down the road until the whole thing goes up in flames.


   
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(@robertm)
Estimable Member
Joined: 3 years ago
Posts: 205
 
Posted by: @sid-genetry-solar
"Decent" cells can/will eventually turn into "heaters" as they degrade.

Yes. I'm wary of my 52V ebike battery.

 


   
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(@dickson)
Noble Member
Joined: 4 years ago
Posts: 1058
 

I do NOT recommend using these.  Personal experience: it's not worth the risk.             Don't do it...unless you fancy rebuilding your garage.

I  almost had to rebuild my bedroom  4 years ago .   The case of  18650 Li-ion cells from laptop batteries is  negative  and the  bus bar  solder to the positive  terminal  touch the case  and the  short  exploded the battery pack  and was almost  impossible to put out  .   


   
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(@robertm)
Estimable Member
Joined: 3 years ago
Posts: 205
 

Your bedroom was no place to for a Li-ion powerwall. 🌋


   
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pilgrimvalley
(@pilgrimvalley)
Prominent Member
Joined: 4 years ago
Posts: 826
Topic starter  

Sean last week YouTube video indicated he wanted 4 of the gs12k inverters which would be theoretically 48000 watts continuous capable albeit in 4 separate systems so the gs12 inverter would not have to run at their red line... evidently they were running 10000 watt loads in their house....

4 gs12 inverters would cost a lot more than one 25k Sandi high voltage inverter let alone the huge amount of high priced copper wire and numerous cheap MSB MPPTs needed.???? but maybe they can make it make economical sense????

fan filters were causing too much restriction to the air flow and inverter performance and causing the inverter to run warmer....i suspected that would be the issue....

high performance PC use water cooling of the processor and quiet fans or ssd to decrease noise and improve their performance ( a different but similar problem of getting rid of the heat) issue....

a better air filtration system of the inverter room without the cat hair and dander would aid his system,,, and cool the room to 76 degrees continuously or slightly less...🤔🤔😎

still never a peep via skype from the powerjack-jack scam or via the ebayseller rayjunglepower.... so still looking for a replacement for the scam 30000 watt powerjack lf psw sp inverter vs the piece of paper they sent in a flat cardboard envelop and claimed they sent a 189 pound inverter....I guarantee you the USPS 70 plus year old mailman will vouch that he definitely did not ever deliver the 189 pound inverter...

hope Sean has better luck!


   
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(@robertm)
Estimable Member
Joined: 3 years ago
Posts: 205
 

What are the chances that Ray, after years of providing Jungle Power solutions, started drinking heavily, and in a moment of desperation, simply mailed out pictures of inverters, then disappeared into the wilds of Borneo?


   
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(@dickson)
Noble Member
Joined: 4 years ago
Posts: 1058
 

Your bedroom was no place to for a Li-ion powerwall

NO  powerwall in my  bedroom  .   I was  soldering   18650 Li-ion cells from laptop batteries  and the  battery  exploded  .  Now I  do NO  soldereing in the house .     


   
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(@dickson)
Noble Member
Joined: 4 years ago
Posts: 1058
 

What are the chances that Ray, after years of providing Jungle Power solutions, started drinking heavily, and in a moment of desperation, simply mailed out pictures of inverters, then disappeared into the wilds of Borneo?

A chance  he may be the  owner of  PJ in China   and will do that  to  Sean  and now NO  cruise to the bahama .     


   
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(@dickson)
Noble Member
Joined: 4 years ago
Posts: 1058
 

a better air filtration system of the inverter room without the cat hair and dander would aid his system,,, and cool the room to 76 degrees continuously or slightly less...

I have to  do what Mike G  do and  put  a 12 kw inverter in  a  shed  cool to 70 degree F by a portable  AC .    That is the only way I can run a 4 ton heat pump after watching  youtube  again .    


   
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(@dickson)
Noble Member
Joined: 4 years ago
Posts: 1058
 

4 gs12 inverters would cost a lot more than one 25k Sandi high voltage inverter let alone the huge amount of high priced copper wire and numerous cheap MSB MPPTs needed.???? but maybe they can make it make economical sense????

I  use 5 MSB MPPTs  for 5000 watts of solar panels   so  30 MSB MPPTs is probably is how many Sean need .      Mike G  in his  later video  say  Sandi 30k  and  400v DC  system is what he will do  IF he can do over again .    A 12 kw inverter will need 4/0 welding cable  at 48 volt and 250 amps    but a 30 kw inverter will need awg 2  at 400 volt and 75 amps .   Four  12 kw GS  will need  250 amp each  and  1000 DC amps total .   The heat  and battery for 4 gs12 inverters would cost a lot more than two  30k Sandi high voltage inverter let alone the huge amount of high priced copper wire .       I  like your math .


   
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