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

then disappeared into the wilds of Borneo?

I  watch a youtube about the headhumters and their blowgun  in Borneo and I  do not think David will go there  but maybe to the Arctic  will be safer .     

maybe he is on the Bahamas cruise before the Artic voyage.... it is obvious they do not care to fulfill their VIP offer to their customer....🤔🤣

Borneo may be too dangerous....could Jack actually be a Jill???

They Power Jacked all the prices higher, then didn't want to fulfill existing orders at the original prices. To trick EBay, they mailed a paper card to use as "proof" of shipment. I'll bet the old account was quickly banned from Ebay, but they were able to start a new account.

To trick EBay, they mailed a paper card to use as "proof" of shipment. I'll bet the old account was quickly banned from Ebay, but they were able to start a new account.

David  other ebay  account  is  has good review .    He is selling  the PJ  3 boxes 25 kw for the price of the  Sandi 25 kw which  is 8000 dollars  now  from China  .    He  delay shipping for 90 days  so  buyer will have a hard time to dispute the credit card for refund .    Ebay show the item was delivered .    He  can do again  with  GS now that  he has so much  practice  and get away with it .      This ia insane .      

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i would never pay that much from the fraud company for any of their stuff.... yes it is totally insane...

the Sandi 20k 25k or 30k would be a better inverter in a high voltage unit that runs cool and does not have to fry your wires with tons of amps.... I guess Mike G also says Sandi can make the high voltage MPPT's.(he said in his later videos)..

yes I also have watched Engineer 775 for many years as I was building ram pumps for harness the water power in the mountains of Bolivia off-grid....to raise the water level into tanks for gravity fed pressurized water all via the force of gravity...

it is hard to Imagine eBay letting them pull this scam trickery.... PowerJack-Jack via skype still has never replied and their scammy seller disappeared "Rayjunglepower" ....

they just keep changing sellers and rebrand the product with different brands such as upower, greenpower,  etc... still powerjack stuff...

they definitely did not impress me with this VIP manuever...a customer lost forever... i may start a thread to alert other potential buyers....on a different solar forum....they already had a garbage name so their high priced stuff is not likely to sell to many people....

i think this PowerJack cardboard scam hurts the GS image as well....but i do not know....another good reason for GS to distance themselves from these scam artists...IMO

the good news is the price of LiFePO4 cells may be going down again as the market is starting to get flooded...

beautiful day, have a great day all 😎😎

But the Sandi High voltage inverter, MPPT and battery system is definitely interesting.....maybe doable this year yet...after I rebuild or buy a heavy trailer for the 50 foot scissor lift...

it is hard to Imagine eBay letting them pull this scam trickery.... PowerJack-Jack via skype still has never replied and their scammy seller disappeared "Rayjunglepower" .

Ebay did not know  until it happen so fast  .      PJ  took a lot of planning  to  scram   that many buyers  from one account  and  I am sure  there are  more than  the 9 that gave reviews .   They planned the delay  and say VIP  service  and then  the faked  delivery  to all the buyers at the same time .      This is scary  as at the same time you got the fake delivery  I  also  had 3 fake  delivery from 3  different  ebay sellers from China  but all  my items are less than ten dollars  .    They send me covid 19  masks  but not the item I order .   

I ordered a Li-ion battery from AliExpress, and quickly realized the specified battery dimensions were much too small for the capacity they advertised. I cancelled the order, which, according to the app, hadn't shipped. I was refunded. The scummy vendor tried to claim it had already shipped. I don't think that I'll ever again order off of Ali-express. Some people claim you just need to carefully choose vendors, but the trickiness of that community is too much for me to deal with.

I've found that AliExpress is like an Amazon with Crypto-market escrow and ratings. Like Amazon, they're pretty customer-favorable, especially when you have some history. One helpful tip would be to favor vendors with US warehouses.

You can get scammed just as easy on Ebay, if not easier.

only one time on aliexpress i did not receive the item i ordered and it was due to it fell out of the packaging...and i was not able to tell what seller sent it... otherwise i have had good success on aliexpress....

on alibaba i have bought lifepo4 cells 3 times and all arrived in new grade A condition,, although they say there are no grade a cells as they are commodity rejects that did not meet the more stringent Electric vehicle  standards so are sold for solar etc.

on eBay i have essentially always received the items i ordered but never ever ran into this type of blatant screw the customer mentality scam that the powerjack-jack and rayjunglepower did to many customers. and claimed VIP treatment but instead sent a cardboards mailer with a piece of paper and claimed delivery...

I always pay with credit card but their attempt to trick the eBay system and go beyond the normal 30 day delivery time frame to purposely defraud the customer via eBay is definitely insane...

be a good idea to talk with your credit card company and read the fine print....for any delayed shipments.....

I think Sean said the transformer now cost 200 dollars more for the gs12....inflation may raise the final price that PowerJack charges them (or scammy greed)??? have to wait and see what they come up with....

hard to tell???

I think Sean said the transformer now cost 200 dollars more for the gs12....inflation may raise the final price that PowerJack charges them (or scammy greed)??? have to wait and see what they come up with....

hard to tell???                                           NO way the same transformer  cost  200 dollars more just like the  PJ 25 kw is  7000  dollars  now  when last year it was 1500 dollars .       As  sloppy as  PJ  put their inverter  together  with tolerance    of  1/2 inch  and  missing screws  and crack solder  .     I am afraid  if they have to make parts  fit with one mm  tolerance then   they  have hire people from  Germany  and manufacturing  cost will  skyrocket .   

16 hours ago, pilgrimvalley said:

I think Sean said the transformer now cost 200 dollars more for the gs12....inflation may raise the final price that PowerJack charges them (or scammy greed)??? have to wait and see what they come up with....

Yes, he did....I questioned that as well and got a clarification from him.  The GS12 "high efficiency" transformer core does cost ~$200 more than the "standard efficiency" transformer core--but that's not a cost increase as much as requesting a better item. 

At least according to my measurements, though, we should be able to use the standard efficiency core and have the same end result--however, without a true double-blind comparison, I can't say for sure.  It would be really bad to order a load of inverters and find that the standard efficiency core won't work...

...and before someone jumps on the "efficiency" word, that's just what PJ uses to reference it.  The actual difference has to do with the core tesla rating--or in plain English, the ideal core voltage.  The "high efficiency" core simply allows use of a higher core voltage...which reduces the amount of windings necessary for the same winding voltage specification.  Reduced windings = less loss, etc.

22 hours ago, Sid Genetry Solar said:

...and before someone jumps on the "efficiency" word, that's just what PJ uses to reference it.  The actual difference has to do with the core tesla rating--or in plain English, the ideal core voltage.  The "high efficiency" core simply allows use of a higher core voltage...which reduces the amount of windings necessary for the same winding voltage specification.  Reduced windings = less loss, etc.

the best core voltage: if one uses a LiFePo4 bank for example in a 24 or even a 48 nominal volt set up >>> what is the ideal core voltage??? the flat part of a LifePO4 battery is 27.2 or 54.4 volts approximately where the voltage does not sag as bad during use... of course one could utilize more LiFePO4 cell to get a high voltage....

so is the ideal core voltage set according to the type of battery and every battery chemistry  would need to utilize a different ideal core voltage or a transformer wound with a different number of turns???

the 27.2 volt or 54.4 volts in changed to AC voltage from DC voltage via a PWM type method, then it is fed into the transformer to jump the voltage to 120 or 240 volts.....as the transformer works only with AC current to produce the electro motive force aka I think it is called...  >>>> the toroidal  step-up transformer boosts the 27.2 or 54.4 volts to the 120/ 240 split phase with the use of the center tapped transformer????

the end question:  is the number of windings for the ideal core voltage determined by the battery voltage and then also by the battery chemistry ???

as the Li-ion chemistry is a more fire prone higher voltage than the slightly lower voltage of LIFePO4 batteries>>> correct...???

I am only utilizing LiFePO4 at this time...

please forgive any (beginner) questions as I am still learning how inverters and transformers work.... it seems that getting rid of excess waste heat would still be a plus to a more efficient ( ideal ) transformer as waste heat is the enemy to component lifespan....

thanks in advance 😎

Core voltage is simply the voltage at which the transformer core operates.  It is dependent on the frequency (60Hz in power inverter cases!), physical cross-sectional area of the core, and the material the core is made out of (this is the difference between the  "standard" vs "high efficiency" cores, as they have the same cross-sectional area + obviously same frequency).

The core voltage and winding ratio are tightly connected.  For example, the required number of turns of wire for each winding is dependent on (Desired_Winding_Voltage / Desired_Core_Voltage = Number_Of_Turns).

This ratio obviously is fixed in hardware.  If the core voltage rises too high, efficiency will plummet, as the core magnetic field will saturate, turning the windings into a dead short.  But note that this is NOT directly affected by battery voltage--as the transformer is technically a fixed ratio.  (For practical purposes, the ratio will change slightly under load due to losses, requiring a higher core voltage under load to maintain the desired output.)

In the case of the GS12, if we run a higher core voltage (that doesn't saturate the core) by means of using fewer turns of wire, the net result is lower winding resistance = lower winding losses.  The issue is that if this saturates the core, efficiency will plummet.

 then also by the battery chemistry ???

as the Li-ion chemistry is a more fire prone higher voltage than the slightly lower voltage of LIFePO4 batteries>>> correct...                                          But note that this is NOT directly affected by battery voltage--as the transformer is technically a fixed ratio

This is hard for me to explain  but some  PJ  has  36 vac transformer  so my lithium-battery is 62v DC input .   IF you wired the LIFePO4 batteries  18s then  the LED   will  not flicker at 61 v .    IF PJ make a 30 vac transformer  then your 16s   LIFePO4 batteries  will probably  run the LED without flicker  until the voltge drop to 46 v.     My LED flicker at  52 v .  The lithium-ion  will  be on fire   with  a  30vac  or a  60vac transformer  .    The lithium-ion  can be on fire  with  low effiency transformer or a high effiency transformer .    Battery chemistry  and high voltage fire  is separate from transformer  design .     Lithium-ion chemistry with high voltage  is safe with temperture senser and cooling and auto shutdown  .     

LED flicker has nothing to do with the transformer voltage spec or the battery voltage. 

It has everything to do with the PJ CPU code voltage regulation--or lack thereof.